Common limpet (Patella vulgata)

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Summary

Description

The conical shell of Patella vulgata is up to 6 cm long with radiating ridges and the apex central or slightly anterior. Individuals from the high shore generally have a taller shell and smaller shell length when compared to juveniles and low shore animals. The outer surface of the shell is greyish white or ashen, sometimes with a yellow tint, and has coarse radiating ridges and well-marked growth lines. The inner surface is smooth and greenish-grey in colour. The sole of the foot is yellowish, dull orange or brown with a grey or greenish tinge. The mantle skirt is fringed with translucent pallial tentacles arranged in three series of different lengths, internal to which lies a complete circlet of pallial gills.

Recorded distribution in Britain and Ireland

Found on all British and Irish coasts wherever there is a suitable hard substratum.

Global distribution

Distributed from north Norway to the Mediterranean.

Habitat

Patella vulgata is found wherever there is substratum firm enough for its attachment on rocks, stones and in rock pools, from the high shore to the sublittoral fringe. It is abundant on all rocky shores of all degrees of wave exposure although the highest densities of Patella vulgata coincide with wave exposed conditions. The species is usually not abundant on shores with a dense growth of seaweed. Patella vulgata extends into estuaries, surviving salinities down to about 20 psu.

Depth range

Intertidal

Identifying features

  • Shell with irregular radiating ribs; apex central or slightly anterior; inner surfaces grey-green.
  • Size up to 6 cm long x 5 cm wide x 3 cm high.
  • Mantle skirt fringed with translucent pallial tentacles arranged in three series of different lengths.
  • Operculum absent.
  • The sole of the foot is yellowish, dull orange or brown with a grey or greenish tinge.

Additional information

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Further information sources

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Biology review

Taxonomy

LevelScientific nameCommon name
PhylumMollusca
ClassGastropoda
FamilyPatellidae
GenusPatella
AuthorityLinnaeus, 1758
Recent Synonyms

Biology

ParameterData
Typical abundanceHigh density
Male size range<6 cm
Male size at maturity16-25 mm
Female size rangeSmall-medium(3-10cm)
Female size at maturity
Growth form
Growth rate2mm/month
Body flexibility
MobilityCreeper
Characteristic feeding methodGrazer
Diet/food sourceHerbivore
Typically feeds onWide range of micro-organisms and algae, including Fucus spp., germlings, other algal sporelings and encrusting red algae.
Sociability
Environmental positionEpifaunal
DependencyIndependent.
SupportsSubstratum

several species: the peritrich protozoon, Urceolaria patellae; the shell boring polychaete Polydora ciliata and the sponge Cliona celata.

Is the species harmful?No

Edible, formerly eaten extensively as shown by stone, bronze and ironage middens. Still eaten until relatively recently, especially during famine and hard times.

Biology information

Female size at maturity. The species is protandric. Females are generally larger although small females are occasionally found. (Orton et al., 1956).

Growth rate. The value given is the maximum rate of increase in shell length observed in the first year of growth by Blackmore (1969). From the findings of many workers, however, it is clear that growth fluctuates from year to year and from place to place to such an extent it is difficult to make general statements. Growth depends on temperature and is greatest in summer, least in winter. Growth also varies between microhabitats being greater under fucoids (17.1 mm per year) than on barnacles (14.7 mm per year) where locomotion and grazing are difficult. Growth rates and longevity are inversely related. Animals under fucoids grow rapidly and may live only 2-3 years whereas those on bare rock, with little food, grow slowly but may live 15-16 years. Limpets move about when the tide is in and the sea is not too rough. Animals are more active when submerged due to the lower energetic cost of moving on mucus when underwater. Under thick fucoid covering or when conditions are damp, individuals may be found on the move after the tide has fallen.

Habitat preferences

ParameterData
Physiographic preferencesEnclosed coast or Embayment, Estuary, Open coast, Strait or Sound
Biological zone preferencesLower eulittoral, Mid eulittoral, Upper eulittoral
Substratum / habitat preferencesArtificial (man-made), Bedrock, Cobbles, Crevices / fissures, Large to very large boulders, Overhangs, Pebbles, Rockpools, Small boulders
Tidal strength preferencesModerately strong 1 to 3 knots (0.5-1.5 m/sec.), Strong 3 to 6 knots (1.5-3 m/sec.), Very strong > 6 knots (>3 m/sec.), Very weak (negligible), Weak < 1 knot (<0.5 m/sec.)
Wave exposure preferencesExposed, Extremely exposed, Extremely sheltered, Moderately exposed, Sheltered, Ultra sheltered, Very exposed, Very sheltered
Salinity preferencesFull (30-40 psu), Reduced (18-30 psu), Variable (18-40 psu)
Depth rangeIntertidal
Other preferences

No text entered

Migration PatternDiel, Seasonal (environment)

Habitat Information

This species extends from the Arctic Circle in Norway to Portugal. Distribution is limited in the north by the ability of newly-settled young to survive cold, and in the south by their ability to withstand heat and desiccation (Bowman & Lewis, 1977). The upper limit of distribution on a shore is increased by shade and exposure. In some situations, seasonal variation in sunshine causes a downward migration in spring/summer and an upward migration in autumn/winter, though the upward movement is not confined to individuals that originally occupied the high levels (Lewis, 1954). Spat settle in pools and damp places, becoming vagrant after emergence for the first 1-3 years and then settle down to a homing lifestyle, although swapping of the home does occur. Adult Patella vulgata generally return after feeding to their so-called 'home scar', a depression in the rock formed by abrasion of the rock surface by the shell, resulting in a tighter fit to the rock and reduced risk of desiccation. Patella vulgata is tolerant of low salinities extending into the mouth of estuaries, surviving in salinities down to about 20 psu (Fish & Fish, 1996).

Life history

Adult characteristics

ParameterData
Reproductive typeProtandrous hermaphrodite
Reproductive frequency See additional information
Fecundity (number of eggs)No information
Generation time2-5 years
Age at maturityMatures as a male at about 9 months of age and then can change to female at 2-3 years of age.
SeasonSee additional text
Life span11-20 years

Larval characteristics

ParameterData
Larval/propagule type-
Larval/juvenile development Planktotrophic
Duration of larval stage2-10 days
Larval dispersal potential Greater than 10 km
Larval settlement periodInsufficient information

Life history information

Reproduction. Patella vulgata become sexually mature as males aged about nine months. Sex change may occur at one year, commonly at two to three, occasionally later and some limpets never become female. Spawning is believed to be induced by rough seas and onshore winds. Eggs (160 µm in diameter) are broadcast singly and fertilized externally. They are dark green in colour due to the presence of a pigment called chromoprotein Y (Fretter & Graham, 1974). The trochophore larva has a pelagic life of about 2 weeks and then settles on rocks at a shell length of about 0.2 mm. Newly settled spat are usually found in rock pools or permanently damp situations. Recruitment fluctuates from year to year and from place to place and Bowman (1981) has pointed out that traditional statements about patellid breeding seasons are not universally valid for the British Isles.

Reproductive frequency. Annual, with peaks within a defined spawning season (October - January) depending on location. Patella vulgata is a winter breeder only in southern England, in the north of Scotland it breeds in August and in north-east England in September.

Sensitivity reviewHow is sensitivity assessed?

Physical pressures

Use / to open/close text displayed

 IntoleranceRecoverabilitySensitivityEvidence / Confidence
Substratum loss [Show more]

Substratum loss

Benchmark. All of the substratum occupied by the species or biotope under consideration is removed. A single event is assumed for sensitivity assessment. Once the activity or event has stopped (or between regular events) suitable substratum remains or is deposited. Species or community recovery assumes that the substratum within the habitat preferences of the original species or community is present. Further details

Evidence

The species is epifaunal so loss of the substratum would also result in loss of the population. Individuals unattached to the substratum are very vulnerable to desiccation and to predation by birds and crabs. Recolonization of Patella vulgata on rocky shores is rapid as seen by the appearance of limpet spat 6 months after the Torrey Canyon oil spill reaching peak numbers 4-5 years after the spill. However, although recolonization was rapid population structure was clearly abnormal for about 15 years because of the complex cycles of dominance involving limpets, barnacles and algae (Hawkins & Southward, 1992).
High High Moderate Moderate
Smothering [Show more]

Smothering

Benchmark. All of the population of a species or an area of a biotope is smothered by sediment to a depth of 5 cm above the substratum for one month. Impermeable materials, such as concrete, oil, or tar, are likely to have a greater effect. Further details.

Evidence

Smothering of limpets by 5cm of sediment for one month is likely to interfere with locomotion, grazing and respiration. If the sediment is fluid and mobile limpets are unlikely to be able to move through the layer of sediment and will probably die. The species is absent from some sheltered shores where silt and algal turfs are likely to restrict space (Professor Steve Hawkins, pers. comm.). If movement through the sediment is possible migration to unsmothered areas may be possible. Settled larvae and spat are likely to be highly intolerant of smothering.
High High Moderate Moderate
Increase in suspended sediment [Show more]

Increase in suspended sediment

Benchmark. An arbitrary short-term, acute change in background suspended sediment concentration e.g., a change of 100 mg/l for one month. The resultant light attenuation effects are addressed under turbidity, and the effects of rapid settling out of suspended sediment are addressed under smothering. Further details

Evidence

Patella vulgata is found in the lower reaches of turbid estuaries where there is sufficient rock or stone on which it may live, and in such muddy habitats, with abundant silt and detritus, the growth rate is rapid (Fretter & Graham, 1994), and is, therefore, unlikely to be adversely affected by an increase in suspended sediment concentration. Therefore, an intolerance of low has been recorded.
Low High Low Moderate
Decrease in suspended sediment [Show more]

Decrease in suspended sediment

Benchmark. An arbitrary short-term, acute change in background suspended sediment concentration e.g., a change of 100 mg/l for one month. The resultant light attenuation effects are addressed under turbidity, and the effects of rapid settling out of suspended sediment are addressed under smothering. Further details

Evidence

Patella vulgata is found on a variety of shores from wave exposed to sheltered and is, therefore, unlikely to be significantly affected by a decrease in suspended sediment concentration and so intolerance is assessed as low.
Low High Low Moderate
Desiccation [Show more]

Desiccation

  1. A normally subtidal, demersal or pelagic species including intertidal migratory or under-boulder species is continuously exposed to air and sunshine for one hour.
  2. A normally intertidal species or community is exposed to a change in desiccation equivalent to a change in position of one vertical biological zone on the shore, e.g., from upper eulittoral to the mid eulittoral or from sublittoral fringe to lower eulittoral for a period of one year. Further details.

Evidence

The species is typically intertidal and in ideal conditions may be found up to the high tide level and is therefore, relatively tolerant of desiccation. During exposure to the air feeding and locomotion are halted unless conditions are very damp. Patella vulgata creates a home-scar allowing it to clamp tightly to the rock to reduce water loss during periods of emersion. The species is tolerant of long periods (several hours) of exposure to the air and can survive up to 65% water loss (Davies, 1969) although tolerance to desiccation is lower in low shore individuals. Smaller limpets are more vulnerable to desiccation than larger ones because of a high surface area: volume ratio. Shell morphology is also important. Higher shore individuals have taller shells which reduces the circumference to body size ratio and hence water loss from the shell margin. As a mobile species Patella vulgata has the ability to determine its position on the shore relative to the preferred zone, can orient itself in this direction and move into more suitable conditions. Migration of limpets up and down the shore in response to seasonal variation in sunshine has been observed (Fretter & Graham, 1994).
Low High Low High
Increase in emergence regime [Show more]

Increase in emergence regime

Benchmark. A one hour change in the time covered or not covered by the sea for a period of one year. Further details

Evidence

Patella vulgata typically moves about when submerged or when conditions are very damp so a change in emergence may alter grazing time. The species is unlikely to be affected by the change in desiccation resulting from increasing or decreasing emergence (see above). Also, as a mobile species adult individuals of Patella vulgata can determine their position on the shore relative to environmental conditions. Therefore, the species is able to change its position on the shore if the emergence regime changes by the benchmark level of one extra hour in air per day for a year. Migration of limpets up and down the shore in response to seasonal variation in sunshine has been observed (Fretter & Graham, 1994).
Low High Low Low
Decrease in emergence regime [Show more]

Decrease in emergence regime

Benchmark. A one hour change in the time covered or not covered by the sea for a period of one year. Further details

Evidence

 No information
Increase in water flow rate [Show more]

Increase in water flow rate

A change of two categories in water flow rate (view glossary) for 1 year, for example, from moderately strong (1-3 knots) to very weak (negligible). Further details

Evidence

Patella vulgata inhabits a range of tidal conditions and is therefore, likely to tolerate a change in water flow rate. The streamlined profile of limpet shells is of importance in increasing their tolerance of water movement, and this is undoubtedly one factor in determining the different shape of limpets at different exposures. With increasing exposure to wave action the shell develops into a low profile reducing the risk of being swept away. The strong muscular foot and a thin film of mucus between the foot and the rock enables Patella vulgata to grip very strongly to the substratum (Fretter & Graham, 1994). The ability of limpets to resist accelerating, as distinct from constant currents, may set a limit to the kind of habitat which they can occupy and limit the size to which they can grow.
Low High Low High
Decrease in water flow rate [Show more]

Decrease in water flow rate

A change of two categories in water flow rate (view glossary) for 1 year, for example, from moderately strong (1-3 knots) to very weak (negligible). Further details

Evidence

 No information
Increase in temperature [Show more]

Increase in temperature

  1. A short-term, acute change in temperature; e.g., a 5°C change in the temperature range for three consecutive days. This definition includes ‘short-term’ thermal discharges.
  2. A long-term, chronic change in temperature; e.g. a 2°C change in the temperature range for a year. This definition includes ‘long term’ thermal discharges.

For intertidal species or communities, the range of temperatures includes the air temperature regime for that species or community. Further details

Evidence

Patella vulgata is a hardy intertidal species and can tolerate long periods of exposure to the air and consequently wide variations in temperature. Therefore adults would not be affected by temperature changes at the benchmark level. Fretter & Graham (1994) showed that adults could survive temperatures of up to 42 °C and 60% water loss. Temperatures in the British Isles do not generally reach this level. Adults are also largely unaffected by short periods of extreme cold. Ekaratne & Crisp (1984) found adult limpets continuing to grow over winter when temperatures fell to -6°C, and stopped only by still more severe weather. However, loss of adhesion after exposure to -13°C has been observed with limpets falling off rocks and therefore becoming easy prey to crabs or birds (Fretter & Graham, 1994). However, in the very cold winter of 1962-3 when temperatures repeatedly fell below 0°C over a period of 2 months large numbers of Patella vulgata were found dead (Crisp, 1964). The ability of newly-settled young Patella vulgata to survive cold and heat is important in setting limits of distribution of the species (Bowman & Lewis, 1977).
Low High Low High
Decrease in temperature [Show more]

Decrease in temperature

  1. A short-term, acute change in temperature; e.g., a 5°C change in the temperature range for three consecutive days. This definition includes ‘short-term’ thermal discharges.
  2. A long-term, chronic change in temperature; e.g. a 2°C change in the temperature range for a year. This definition includes ‘long term’ thermal discharges.

For intertidal species or communities, the range of temperatures includes the air temperature regime for that species or community. Further details

Evidence

 No information
Increase in turbidity [Show more]

Increase in turbidity

  1. A short-term, acute change; e.g., two categories of the water clarity scale (see glossary) for one month, such as from medium to extreme turbidity.
  2. A long-term, chronic change; e.g., one category of the water clarity scale (see glossary) for one year, such as from low to medium turbidity. Further details

Evidence

Changes in turbidity will probably have little direct effect on the limpets. Some populations live in estuaries where turbidity tends to be high. However, Patella vulgata feeds mainly on algae and increased turbidity may reduce the photosynthetic capability of algae and so decrease food availability. Reduced food availability may reduce limpet growth rates and reproductive capacity. Decreases in turbidity are unlikely to have any effect.
Low Very high Very Low Low
Decrease in turbidity [Show more]

Decrease in turbidity

  1. A short-term, acute change; e.g., two categories of the water clarity scale (see glossary) for one month, such as from medium to extreme turbidity.
  2. A long-term, chronic change; e.g., one category of the water clarity scale (see glossary) for one year, such as from low to medium turbidity. Further details

Evidence

 No information
Increase in wave exposure [Show more]

Increase in wave exposure

A change of two ranks on the wave exposure scale (view glossary) e.g., from Exposed to Extremely exposed for a period of one year. Further details

Evidence

Patella vulgata is found on rocky shores from the most exposed to the most sheltered although the highest densities coincide with moderate exposure (Fretter & Graham, 1994). Under conditions of very high exposure Patella vulgata may be limited to the upper region of the shore, its place being taken below mean tide level by Patella aspera (Blackmore, 1969). Wave action causes shell muscles to contract vigorously, clamping the animal to the rock. The full strength of pull of the pedal muscles has been estimated as 3.5kg/cm² (Fischer, 1948). This force, together with the fact that the conical shell offers little resistance to waves, secures the animal against the action of the waves in the most exposed situations. A decrease in wave exposure may reduce Patella vulgata abundance because the species does not favour thick algal cover that is often present on very sheltered shores.
Low High Low High
Decrease in wave exposure [Show more]

Decrease in wave exposure

A change of two ranks on the wave exposure scale (view glossary) e.g., from Exposed to Extremely exposed for a period of one year. Further details

Evidence

 No information
Noise [Show more]

Noise

  1. Underwater noise levels e.g., the regular passing of a 30-metre trawler at 100 metres or a working cutter-suction transfer dredge at 100 metres for one month during important feeding or breeding periods.
  2. Atmospheric noise levels e.g., the regular passing of a Boeing 737 passenger jet 300 metres overhead for one month during important feeding or breeding periods. Further details

Evidence

Although limpets are not likely to be affected by atmospheric noise levels vibrations near to the animal will cause the shell muscles to contract vigorously, clamping the limpet to the rock (Fretter & Graham, 1994).
Low High Low Low
Visual presence [Show more]

Visual presence

Benchmark. The continuous presence for one month of moving objects not naturally found in the marine environment (e.g., boats, machinery, and humans) within the visual envelope of the species or community under consideration. Further details

Evidence

Although the species has eyes, visual perception is probably quite limited and as such the species is unlikely to be sensitive to the visual presence of humans on the shore, for example. Patella vulgata has a low risk of predation because of its hard shell and so does not need the visual acuity required by some species to avoid predators.
Tolerant Not relevant Not sensitive Low
Abrasion & physical disturbance [Show more]

Abrasion & physical disturbance

Benchmark. Force equivalent to a standard scallop dredge landing on or being dragged across the organism. A single event is assumed for assessment. This factor includes mechanical interference, crushing, physical blows against, or rubbing and erosion of the organism or habitat of interest. Where trampling is relevant, the evidence and trampling intensity will be reported in the rationale. Further details.

Evidence

The adult has a tough shell that offers protection from any abrading factors and any near vibration causes the shell muscles to contract vigorously, clamping the animal to the rock. A short, sharp knock may dislodge an individual leaving it vulnerable to predation and small limpets may be crushed by people trampling on the shore. However, small individuals tend to occupy depressions, crevices, or pools that would provide protection from trampling. Therefore, an intolerance of low has been recorded.
Low Very high Very Low Very low
Displacement [Show more]

Displacement

Benchmark. Removal of the organism from the substratum and displacement from its original position onto a suitable substratum. A single event is assumed for assessment. Further details

Evidence

Limpets are intolerant of being knocked off the rock by trampling on the shore and if the foot is damaged do not re-attach easily (Professor Steve Hawkins, pers. comm.). Displaced individuals with the foot exposed to the air, are likely to become prone to predation and desiccation and may die. If individuals remain foot down on rock after displacement and are not damaged they may be able to become reattached. However, individuals removed several feet from their scars do not appear to make their way home again (Fretter & Graham, 1996) and so may be more vulnerable to desiccation without the tight fit to their 'home scar'.
Intermediate High Low Very low

Chemical pressures

Use [show more] / [show less] to open/close text displayed

 IntoleranceRecoverabilitySensitivityEvidence / Confidence
Synthetic compound contamination [Show more]

Synthetic compound contamination

Sensitivity is assessed against the available evidence for the effects of contaminants on the species (or closely related species at low confidence) or community of interest. For example:

  • evidence of mass mortality of a population of the species or community of interest (either short or long term) in response to a contaminant will be ranked as high sensitivity;
  • evidence of reduced abundance, or extent of a population of the species or community of interest (either short or long term) in response to a contaminant will be ranked as intermediate sensitivity;
  • evidence of sub-lethal effects or reduced reproductive potential of a population of the species or community of interest will be assessed as low sensitivity.

The evidence used is stated in the rationale. Where the assessment can be based on a known activity then this is stated. The tolerance to contaminants of species of interest will be included in the rationale when available; together with relevant supporting material. Further details.

Evidence

Limpets are extremely intolerant of aromatic solvent based dispersants used in oil spill clean-up. During the clean-up response to the Torrey Canyon oil spill nearly all the limpets were killed in areas close to dispersant spraying. Viscous oil will not be readily drawn in under the edge of the shell by ciliary currents in the mantle cavity, whereas detergent, alone or diluted in sea water, would creep in much more readily and be liable to kill the limpet (Smith, 1968). A concentration of 5ppm killed half the limpets tested in 24 hours (Southward & Southward, 1978; Hawkins & Southward, 1992). Acidified sea-water affects the motility of Patella vulgata. At a pH of 5.5 motility was reduced whilst submerged but individuals recovered when returned to normal sea-water. At a pH of 2.5 total inhibition of movement occurred and when returned to normal sea-water half had died (Bonner et al., 1993). Reduced motility reduces time for foraging and may result in decreased survival of individuals. Acidified seawater can also change the shell composition which will lead to a decrease in its protective nature and hence survival (Bonner et al., 1993). Short periods (48 hours) are unlikely to have much effect on a population but long periods (1 year) may cause reduced grazing and an increase in algal growth. However, sea-water is unlikely to reach pH 2.5 therefore intolerance to slight changes in pH will be low. Gastropod molluscs are known to be intolerant of endocrine disruption from synthetic chemicals such as tri-butyl tin (Cole et al., 1999). However no information on the specific effects of tri-butyl tin on Patella vulgata was found. Hoare & Hiscock (1974) reported that in Amlwch Bay Patella vulgata was excluded from sites within 100-150m of the discharge of acidified, halogenated effluent.
High High Moderate High
Heavy metal contamination [Show more]

Heavy metal contamination

Evidence

Bryan (1984) suggested that gastropods are rather tolerant of heavy metals. In the Fal estuary Patella vulgata occurs at, or just outside, Restronguet Point at the end of the creek where metal concentrations are in the order: Zinc (Zn) 100-2000µg/l, copper (Cu) 10-100µg/l and cadmium (Cd) 0.25-5µg/l (Bryan & Gibbs, 1983). However, in the laboratory Patella vulgata was found to be intolerant of small changes in environmental concentrations of Cd and Zn by Davies (1992). At concentrations of 10µg/l pedal mucus production and levels of activity were both reduced, indicating a physiological response to metal concentrations. Exposure to Cu at a concentration of 100µg/l for one week resulted in progressive brachycardia (slowing of the heart beat) and the death of limpets. Zn at a concentration of 5500µg/l produced the same effect (Marchan et al.,1999).
Intermediate High Low Moderate
Hydrocarbon contamination [Show more]

Hydrocarbon contamination

Evidence

In areas of moderate oil deposit, up to about 1/2cm thick, on rocks after the Torrey Canyon oil spill, limpets had survived unscathed over a month after the event and feeding continued even though a coating of oil smothered their food source of algae and diatoms (Smith, 1968). Limpets can ingest thick oil and pass it through their gut. However, thick layers of oil smothering individuals will interfere with respiration and spoil normal food supplies for Patella vulgata. Limpets are unable to remain closed off from the environment for very long, the adductor muscles relax occasionally, lifting the shell very slightly. After the Braer oil spill, in common with many other oil spills, the major impact in the intertidal zone was on the population of limpets and other grazers. In West Angle Bay, where fresh oil from the Sea Empress tanker reached rocky shores within one day of the spill, limpet mortality was 90% (Glegg et al., 1999). Thus Patella vulgata has higher intolerance to fresh oil which has a high component of volatile hydrocarbons remaining. A significant reduction in the density of juvenile limpets was also observed at all sites known to have been oiled by the Sea Empress spill (Moore, 1997). In longer term studies into the environmental effects of oil refinery effluent discharged into Littlewick Bay, Milford Haven, the number of limpets, usually found in substantial numbers on this type of shore, were considerably reduced in abundance on areas close to the discharge (Petpiroon & Dicks, 1982). In particular only large individuals were found close to the outfall point and juveniles were completely absent, suggesting that observed changes in abundance resulted from effluent effects on larval stages rather than upon adults directly.
High High Moderate High
Radionuclide contamination [Show more]

Radionuclide contamination

Evidence

Insufficient
information.
No information No information No information Not relevant
Changes in nutrient levels [Show more]

Changes in nutrient levels

Evidence

The species occurs on all British and Irish coasts, including lower salinity areas such as estuaries where nutrient loading is likely to be higher than elsewhere and so intolerance is likely to be low. Higher nutrient levels will increase the growth of algae which will increase the food available to Patella vulgata. Although no direct correlation between increased nutrient levels and growth rate was found in the literature in estuaries with high levels of silt and detritus the growth rate of the species was rapid (Fretter & Graham, 1994). However, if nutrient loading is excessive this can have a detrimental effect on algal productivity and hence limpet growth.
Low High Low Very low
Increase in salinity [Show more]

Increase in salinity

  1. A short-term, acute change; e.g., a change of two categories from the MNCR salinity scale for one week (view glossary) such as from full to reduced.
  2. A long-term, chronic change; e.g., a change of one category from the MNCR salinity scale for one year (view glossary) such as from reduced to low. Further details.

Evidence

Patella vulgata can tolerate varying salinities and its distribution extends into the mouths of estuaries surviving in salinities down to about 20psu. However, growth and reproduction may be impaired in reduced salinity. Little et al. (1991), for example, observed reduced levels of activity in limpets after heavy rainfall and in the laboratory activity completely stopped at 12psu. The species can endure periods of low salinity and was found to die only when the salinity was reduced to 3-1psu (Fretter & Graham, 1994). In experiments where freshwater was trickled over the shell Arnold (1957) observed limpets withdrawing and clamping the shell onto the substratum. There appears to be an increasing tolerance of low salinities from the lower to the upper limit of distribution of the species on the shore (Fretter & Graham, 1994).
Low High Low High
Decrease in salinity [Show more]

Decrease in salinity

  1. A short-term, acute change; e.g., a change of two categories from the MNCR salinity scale for one week (view glossary) such as from full to reduced.
  2. A long-term, chronic change; e.g., a change of one category from the MNCR salinity scale for one year (view glossary) such as from reduced to low. Further details.

Evidence

 No information
Changes in oxygenation [Show more]

Changes in oxygenation

Benchmark.  Exposure to a dissolved oxygen concentration of 2 mg/l for one week. Further details.

Evidence

An oxygen concentration at the level of the benchmark, 2mg/l, is thought likely to cause adverse effects in marine organisms. In laboratory experiments a reduction in the oxygen tension of seawater from 148mm Hg (air saturated seawater) to 50mm Hg rapidly resulted in reduced heart rate in limpets of the genus Patella (Marshall & McQuaid, 1993). Heartbeat rate returned to normal in oxygenated water within two hours. In oxygen free water limpet metabolic rate gradually fell eventually resulting in death only after 36 hours (Grenon & Walker,1981). Therefore, some individuals may survive for one week at an oxygen concentration of 2mg/l and so intolerance is set at intermediate. However, Patella vulgata is an intertidal species, being able to respire in air, so will only be intolerant of low oxygen in the water column intermittently during periods of tidal immersion. In addition, in areas of wave exposure and moderately strong current flow low oxygen levels in the water are unlikely to persist for very long.
Intermediate High Low Moderate

Biological pressures

Use [show more] / [show less] to open/close text displayed

 IntoleranceRecoverabilitySensitivityEvidence / Confidence
Introduction of microbial pathogens/parasites [Show more]

Introduction of microbial pathogens/parasites

Benchmark. Sensitivity can only be assessed relative to a known, named disease, likely to cause partial loss of a species population or community. Further details.

Evidence

Patella vulgata has been reported to be infected by the protozoan Urceolaria patellae (Brouardel, 1948) at sites sheltered from extreme wave action in Orkney. Baxter (1984) found shells to be infested with two boring organisms, the polychaete Polydora ciliata and a siliceous sponge Cliona celata.
No information No information No information Not relevant
Introduction of non-native species [Show more]

Introduction of non-native species

Sensitivity assessed against the likely effect of the introduction of alien or non-native species in Britain or Ireland. Further details.

Evidence

No known non-native species compete with Patella vulgata.
Not relevant Not relevant Not relevant Not relevant
Extraction of this species [Show more]

Extraction of this species

Benchmark. Extraction removes 50% of the species or community from the area under consideration. Sensitivity will be assessed as 'intermediate'. The habitat remains intact or recovers rapidly. Any effects of the extraction process on the habitat itself are addressed under other factors, e.g. displacement, abrasion and physical disturbance, and substratum loss. Further details.

Evidence

This species is occasionally harvested by hand, without regulation, for human consumption. However, the delicate balance between limpets and algae is easily disturbed by even a small, localised temporary absence of limpets (Southward, 1956; Southward, 1964; Hawkins, 1981; Hawkins et al., 1983). Removal of limpets at the benchmark level of 50% is likely to result in significant changes in community composition. Significant limpet kills resulting from the widespread use of dispersants after the Torrey Canyon oil spill dramatically altered rocky shore communities. Laminaria digitata, for example, was able to extend 2m upshore in the absence of limpets and there were dense growths of ephemeral green seaweeds followed by equally dense growth of fucoids (Southward & Southward, 1978; Hawkins & Southward, 1992).
Intermediate High Low Moderate
Extraction of other species [Show more]

Extraction of other species

Benchmark. A species that is a required host or prey for the species under consideration (and assuming that no alternative host exists) or a keystone species in a biotope is removed. Any effects of the extraction process on the habitat itself are addressed under other factors, e.g. displacement, abrasion and physical disturbance, and substratum loss. Further details.

Evidence

Adult Patella vulgata have no known obligate relationships. However, field studies support the suggestion that larvae of Patella spp. are induced to settle by chemicals in the red algae Lithothamnia (Bowman, 1981). Neither newly settled or older juveniles of any species are found on dead Lithothamnia even if the patch had been well-colonized when alive and although niches and epiphytes remain. Settlement on Lithothamnia benefits the young limpet by ensuring it settles in a permanently wet habitat and the pits in the surface probably also afford protection from the grazing of larger limpets. Therefore removal of Lithothamnia may be detrimental to recruitment of limpets.
Low High Low Low

Additional information

Importance review

Policy/legislation

- no data -

Status

Non-native

ParameterData
Native-
Origin-
Date Arrived-

Importance information

Biotope structure and community importance. Grazing by Patella vulgata can be an important structuring feature on rocky shores and is often considered to be a keystone species on North East Atlantic rocky shores. Reductions in limpet density have been observed to have a significant impact on rocky shore community composition, particularly of fucoid algae and barnacles (Raffaelli & Hawkins, 1996; Hawkins & Hartnol, 1985).

Culinary use. Collection of limpets for culinary use is on a local scale.

Bibliography

  1. Arnold, D.C., 1957. The response of the limpet, Patella vulgata L., to waters of different salinities. Journal of the Marine Biological Association of the United Kingdom, 36, 121-128.

  2. Baxter, J.M., 1984. The incidence of Polydora ciliata and Cliona celata boring the shell of Patella vulgata in Orkney. Journal of the Marine Biological Association of the United Kingdom, 64, 728-729.

  3. Blackmore, D.T., 1969. Growth, reproduction and zonation of Patella vulgata. Journal of Experimental Marine Biology and Ecology, 3, 200-213.

  4. Bonner, T. M., Pyatt, F. B. & Storey, D. M., 1993. Studies on the motility of the limpet Patella vulgata in acidified sea-water. International Journal of Environmental Studies, 43, 313-320.

  5. Bowman, R.S. & Lewis, J.R., 1977. Annual fluctuations in the recruitment of Patella vulgata L. Journal of the Marine Biological Association of the United Kingdom, 57, 793-815.

  6. Bowman, R.S., 1981. The morphology of Patella spp. juveniles in Britain, and some phylogenetic inferences. Journal of the Marine Biological Association of the United Kingdom, 61, 647-666.

  7. Brouardel, J., 1948. Etude du mode d'infestation des Patelles par Urceolaria patellae (Cuenot): influence de l'espece de Patelle. Bulletin du Laboratoire maritime de Dinard, 30, 1-6.

  8. Bryan, G.W. & Gibbs, P.E., 1983. Heavy metals from the Fal estuary, Cornwall: a study of long-term contamination by mining waste and its effects on estuarine organisms. Plymouth: Marine Biological Association of the United Kingdom. [Occasional Publication, no. 2.]

  9. Bryan, G.W., 1984. Pollution due to heavy metals and their compounds. In Marine Ecology: A Comprehensive, Integrated Treatise on Life in the Oceans and Coastal Waters, vol. 5. Ocean Management, part 3, (ed. O. Kinne), pp.1289-1431. New York: John Wiley & Sons.

  10. Campbell, A., 1994. Seashores and shallow seas of Britain and Europe. London: Hamlyn.

  11. Crisp, D.J. (ed.), 1964. The effects of the severe winter of 1962-63 on marine life in Britain. Journal of Animal Ecology, 33, 165-210.

  12. Davies, M.S., 1992. Heavy metals in seawater: effects on limpet pedal mucus production. Water Research, 26, 1691-1693.

  13. Davies, P.S., 1969. Physiological ecology of Patella III. Desiccation effects. Journal of the Marine Biological Association of the United Kingdom, 49, 291-304.

  14. Davis, J.R.A. & Fleure, R.J., 1903. Patella. Liverpool Marine Biological Committee Memoir, 10, 1-76.

  15. Ekaratne, S.U.K. & Crisp, D.J., 1984. Seasonal growth studies of intertidal gastropods from shell micro-growth band measurements, including a comparison with alternative methods. Journal of the Marine Biological Association of the United Kingdom, 64, 183-210.

  16. Fischer, P. H., 1948. Donnees sur la resistance et le vitalite des mollusques. Journal de Conchyliologie, 88, 100-140.

  17. Fish, J.D. & Fish, S., 1996. A student's guide to the seashore. Cambridge: Cambridge University Press.

  18. Fretter, V. & Graham, A., 1994. British prosobranch molluscs: their functional anatomy and ecology, revised and updated edition. London: The Ray Society.

  19. Fretter, V., & Graham, A., 1976. The Prosobranch Molluscs of Britain and Denmark. Part 1. - Pleurotomariacea, Fissurellacea and Patellacea. Journal of Molluscan Studies, Supplement 1.

  20. Glegg, G. A., Hickman, L. & Rowland, S. J., 1999. Contamination of limpets (Patella vulgata) following the Sea Empress oil spill. Marine Pollution Bulletin, 38, 119-125.

  21. Grenon, J.F. & Walker, G., 1981. The tenacity of the limpet, Patella vulgata L.: an experimental approach. Journal of Experimental Marine Biology and Ecology, 54, 277-308.

  22. Hawkins, S.J. & Hartnoll, R.G., 1985. Factors determining the upper limits of intertidal canopy-forming algae. Marine Ecology Progress Series, 20, 265-271.

  23. Hawkins, S.J. & Southward, A.J., 1992. The Torrey Canyon oil spill: recovery of rocky shore communities. In Restoring the Nations Marine Environment, (ed. G.W. Thorpe), Chapter 13, pp. 583-631. Maryland, USA: Maryland Sea Grant College.

  24. Hawkins, S.J., Southward, A.J. & Barrett, R.L., 1983. Population structure of Patella vulgata (L.) during succession on rocky shores in southwest England. Oceanologica Acta, Special Volume, 103-107.

  25. Hayward, P., Nelson-Smith, T. & Shields, C. 1996. Collins pocket guide. Sea shore of Britain and northern Europe. London: HarperCollins.

  26. Hayward, P.J. & Ryland, J.S. (ed.) 1995b. Handbook of the marine fauna of North-West Europe. Oxford: Oxford University Press.

  27. Hoare, R. & Hiscock, K., 1974. An ecological survey of the rocky coast adjacent to the effluent of a bromine extraction plant. Estuarine and Coastal Marine Science, 2 (4), 329-348.

  28. Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]

  29. Jones, N.S., 1948. Observations on the biology of Patella vulgata at Port St. Mary, Isle of Man. Proceedings and Transactions of the Liverpool Biological Society, 56, 60-77.

  30. Lewis, J.R., 1954. Observations on a high-level population of limpets. Journal of Animal Ecology, 23, 85-100.

  31. Little, C., Partridge, J.C. & Teagle, L., 1991. Foraging activity of limpets in normal and abnormal tidal regimes. Journal of the Marine Biological Association of the United Kingdom, 71, 537-554.

  32. Marchan, S., Davies, M.S., Fleming, S. & Jones, H.D., 1999. Effects of copper and zinc on the heart rate of the limpet Patella vulgata (L.) Comparative Biochemistry and Physiology, 123A, 89-93.

  33. Moore, J., 1997. Rocky shore transect monitoring in Milford Haven, October 1996. Impacts of the Sea Empress oil spill. Countryside Council for Wales Sea Empress Contract Report, 241, 90pp.

  34. Orton, J.H., Southward, A.J. & Dodd, J.M., 1956. Studies on the biology of limpets II. The breeding of Patella vulgata L. in Britain. Journal of the Marine Biological Association of the United Kingdom, 35, 149-176.

  35. Petpiroon, S. & Dicks, B., 1982. Environmental effects (1969 to 1981) of a refinery effluent discharged into Littlewick Bay, Milford Haven. Field Studies, 5, 623-641.

  36. Raffaelli, D.G.  & Hawkins, S.J., 1999. Intertidal Ecology 2nd edn.. London: Kluwer Academic Publishers.

  37. Smith, J.E. (ed.), 1968. 'Torrey Canyon'. Pollution and marine life. Cambridge: Cambridge University Press.

  38. Southward, A.J. & Southward, E.C., 1978. Recolonisation of rocky shores in Cornwall after use of toxic dispersants to clean up the Torrey Canyon spill. Journal of the Fisheries Research Board of Canada, 35, 682-706.

  39. Southward, A.J., 1964. Limpet grazing and the control of vegetation on rocky shores. In Grazing in Terrestrial and Marine Environments, British Ecological Society Symposium No. 4 (ed. D.J. Crisp), 265-273.

  40. Thompson, G.B., 1980. Distribution and population dynamics of the limpet Patella vulgata in Bantry Bay. Journal of Experimental Marine Biology and Ecology, 45, 173-217.

Datasets

  1. Bristol Regional Environmental Records Centre, 2017. BRERC species records recorded over 15 years ago. Occurrence dataset: https://doi.org/10.15468/h1ln5p accessed via GBIF.org on 2018-09-25.

  2. Bristol Regional Environmental Records Centre, 2017. BRERC species records within last 15 years. Occurrence dataset: https://doi.org/10.15468/vntgox accessed via GBIF.org on 2018-09-25.

  3. Centre for Environmental Data and Recording, 2018. IBIS Project Data. Occurrence dataset: https://www.nmni.com/CEDaR/CEDaR-Centre-for-Environmental-Data-and-Recording.aspx accessed via NBNAtlas.org on 2018-09-25.

  4. Centre for Environmental Data and Recording, 2018. Ulster Museum Marine Surveys of Northern Ireland Coastal Waters. Occurrence dataset https://www.nmni.com/CEDaR/CEDaR-Centre-for-Environmental-Data-and-Recording.aspx accessed via NBNAtlas.org on 2018-09-25.

  5. Cofnod – North Wales Environmental Information Service, 2018. Miscellaneous records held on the Cofnod database. Occurrence dataset: https://doi.org/10.15468/hcgqsi accessed via GBIF.org on 2018-09-25.

  6. Conchological Society of Great Britain & Ireland, 2018. Mollusc (marine) data for Great Britain and Ireland - restricted access. Occurrence dataset: https://doi.org/10.15468/4bsawx accessed via GBIF.org on 2018-09-25.

  7. Conchological Society of Great Britain & Ireland, 2023. Mollusc (marine) records for Great Britain and Ireland. Occurrence dataset: https://doi.org/10.15468/aurwcz accessed via GBIF.org on 2024-09-27.

  8. Environmental Records Information Centre North East, 2018. ERIC NE Combined dataset to 2017. Occurrence dataset: http://www.ericnortheast.org.ukl accessed via NBNAtlas.org on 2018-09-38

  9. Fenwick, 2018. Aphotomarine. Occurrence dataset http://www.aphotomarine.com/index.html Accessed via NBNAtlas.org on 2018-10-01

  10. Fife Nature Records Centre, 2018. St Andrews BioBlitz 2014. Occurrence dataset: https://doi.org/10.15468/erweal accessed via GBIF.org on 2018-09-27.

  11. Fife Nature Records Centre, 2018. St Andrews BioBlitz 2015. Occurrence dataset: https://doi.org/10.15468/xtrbvy accessed via GBIF.org on 2018-09-27.

  12. Fife Nature Records Centre, 2018. St Andrews BioBlitz 2016. Occurrence dataset: https://doi.org/10.15468/146yiz accessed via GBIF.org on 2018-09-27.

  13. Kent Wildlife Trust, 2018. Biological survey of the intertidal chalk reefs between Folkestone Warren and Kingsdown, Kent 2009-2011. Occurrence dataset: https://www.kentwildlifetrust.org.uk/ accessed via NBNAtlas.org on 2018-10-01.

  14. Kent Wildlife Trust, 2018. Kent Wildlife Trust Shoresearch Intertidal Survey 2004 onwards. Occurrence dataset: https://www.kentwildlifetrust.org.uk/ accessed via NBNAtlas.org on 2018-10-01.

  15. Lancashire Environment Record Network, 2018. LERN Records. Occurrence dataset: https://doi.org/10.15468/esxc9a accessed via GBIF.org on 2018-10-01.

  16. Manx Biological Recording Partnership, 2017. Isle of Man wildlife records from 01/01/2000 to 13/02/2017. Occurrence dataset: https://doi.org/10.15468/mopwow accessed via GBIF.org on 2018-10-01.

  17. Manx Biological Recording Partnership, 2018. Isle of Man historical wildlife records 1995 to 1999. Occurrence dataset: https://doi.org/10.15468/lo2tge accessed via GBIF.org on 2018-10-01.

  18. Merseyside BioBank., 2018. Merseyside BioBank (unverified). Occurrence dataset: https://doi.org/10.15468/iou2ld accessed via GBIF.org on 2018-10-01.

  19. National Trust, 2017. National Trust Species Records. Occurrence dataset: https://doi.org/10.15468/opc6g1 accessed via GBIF.org on 2018-10-01.

  20. NBN (National Biodiversity Network) Atlas. Available from: https://www.nbnatlas.org.

  21. Norfolk Biodiversity Information Service, 2017. NBIS Records to December 2016. Occurrence dataset: https://doi.org/10.15468/jca5lo accessed via GBIF.org on 2018-10-01.

  22. OBIS (Ocean Biodiversity Information System),  2024. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2024-11-24

  23. Outer Hebrides Biological Recording, 2018. Invertebrates (except insects), Outer Hebrides. Occurrence dataset: https://doi.org/10.15468/hpavud accessed via GBIF.org on 2018-10-01.

  24. South East Wales Biodiversity Records Centre, 2018. SEWBReC Molluscs (South East Wales). Occurrence dataset: https://doi.org/10.15468/jos5ga accessed via GBIF.org on 2018-10-02.

  25. South East Wales Biodiversity Records Centre, 2018. Dr Mary Gillham Archive Project. Occurance dataset: http://www.sewbrec.org.uk/ accessed via NBNAtlas.org on 2018-10-02

  26. Suffolk Biodiversity Information Service., 2017. Suffolk Biodiversity Information Service (SBIS) Dataset. Occurrence dataset: https://doi.org/10.15468/ab4vwo accessed via GBIF.org on 2018-10-02.

  27. The Wildlife Information Centre, 2018. TWIC Biodiversity Field Trip Data (1995-present). Occurrence dataset: https://doi.org/10.15468/ljc0ke accessed via GBIF.org on 2018-10-02.

  28. Yorkshire Wildlife Trust, 2018. Yorkshire Wildlife Trust Shoresearch. Occurrence dataset: https://doi.org/10.15468/1nw3ch accessed via GBIF.org on 2018-10-02.

Citation

This review can be cited as:

Hill, J.M. 2008. Patella vulgata Common limpet. In Tyler-Walters H. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 24-11-2024]. Available from: https://marlin.ac.uk/species/detail/1371

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Last Updated: 29/05/2008