Sea beech (Delesseria sanguinea)

Distribution data supplied by the Ocean Biodiversity Information System (OBIS). To interrogate UK data visit the NBN Atlas.Map Help

Summary

Description

A conspicuous crimson seaweed up to 30 cm in length. Blades are oval or lanceolate, leaf like and reminiscent of beech leaves. The membranous lamina has a wavy margin and is supported by a conspicuous midrib with opposite pairs of lateral veins. The irregularly shaped, thickened holdfast (about 0.5 cm in diameter) gives rise to a short cylindrical stipe about 1 cm long. The stipe branches sparingly giving rise to spirally arranged blades (about 1.5 - 4 cm wide). The leaves may be pointed in young specimens. In autumn the membranous lamina is lost so that only the midrib remains. Reproductive bodies (e.g. cystocarp) develop on the naked midrib. Cystocarp are globular, with a membranous border, and form in fairly close formation on a short stalks on female plants. Carpogonia on female plants are fertilised during October but carpospores are not released until February. New fronds may grow before all reproductive structures disappear. Reproductive leaflets also grow on the denuded midrib in male and asexual plants. On the male plants tetrasporangial bladelets appear in November and tetraspores released in January and February [Kain & Bates, 1993]. Very wave battered plants may be confused with Phycodrys rubens (q.v.) which has lobed or toothed blades.

Recorded distribution in Britain and Ireland

Recorded from all coasts of the British Isles. However, records from the east coasts are sparse, presumably due to the lack of suitable substrata.

Global distribution

Recorded from the north eastern coast of Iceland to the Russian coast near Murmansk. Its southern limit is in Sables d'Olonnes, northern France. It is also found in the Baltic.

Habitat

May be found in deep pools in the lower eulittoral and subtidally to at least 30 m. It is a characteristic member of the understorey flora in Laminaria hyperborea (kelp) forests. It may occasionally be epiphytic on Laminaria hyperborea stipes.

Depth range

1-30m

Identifying features

  • Bright red, often crimson in colour.
  • Margin of lamina wavy but not serrated.
  • Similar to beech leaves in appearance.
  • Midrib and blade veins conspicuous.
  • Usually branched from, or near to, the base of the stipe.

Additional information

Young specimens may be confused with Apoglossum ruscifolium (q.v.) or Hypoglossum hypoglossoides (q.v.) although these species lack the conspicuous lateral veins of Delesseria sanguinea. Wave eroded (battered) specimens may resemble Phycodrys rubens. However, true Phycodrys rubens has lobed or toothed blades and reproductive structures are born on mature blades.

Listed by

- none -

Biology review

Taxonomy

LevelScientific nameCommon name
PhylumRhodophyta
ClassFlorideophyceae
OrderCeramiales
FamilyDelesseriaceae
GenusDelesseria
Authority(Hudson) J.V.Lamouroux, 1813
Recent Synonyms

Biology

ParameterData
Typical abundanceModerate density
Male size range
Male size at maturity
Female size rangeMedium-large(21-50cm)
Female size at maturity
Growth formTurf
Growth rateInsufficient information
Body flexibility
Mobility
Characteristic feeding methodAutotroph
Diet/food source
Typically feeds onNot relevant
Sociability
Environmental positionEpifloral
DependencyIndependent.
SupportsNo information found
Is the species harmful?No

Biology information

Delesseria sanguinea is perennial and exhibits a complex life cycle. This species exhibits a strong seasonal pattern of growth and reproduction. New blades appear in February and grow to full size by May -June becoming increasing battered or torn and the lamina are reduced to midribs by December (Maggs & Hommersand, 1993). Blade weight is maximal in midsummer, growth dropping in June and July and becoming zero in August (Kain, 1984). Small new blades may be formed in darkness, reserves translocated from assimilates stored in the frond ribs and stipes which persist in winter (Luning, 1990; Maggs & Hommersand, 1993). Kain (1987) suggested that new blade growth may result from an increase in irradiance and hence inhibition of reproduction (e.g. due to removal of Laminarian plants from a kelp canopy) which may explain occasional crop of new blades noted in summer. Kain (1987) also suggested that the normal seasonal trigger for new blade production was temperature, probably when temperatures fell to 13 deg C or below. Morphology, salinity and temperature tolerances differ between North Sea and Baltic populations. In the Baltic specimens are smaller than British specimens, with thinner blades. Temperature and salinity tolerances are probably genetically determined (Rietema, 1993).

Habitat preferences

ParameterData
Physiographic preferencesStrait or Sound, Ria or Voe, Enclosed coast or Embayment
Biological zone preferencesLower eulittoral, Sublittoral fringe, Upper infralittoral
Substratum / habitat preferencesBedrock, Large to very large boulders, Rockpools, Small boulders
Tidal strength preferencesModerately strong 1 to 3 knots (0.5-1.5 m/sec.), Weak < 1 knot (<0.5 m/sec.)
Wave exposure preferencesExposed, Extremely exposed, Moderately exposed, Very exposed
Salinity preferencesFull (30-40 psu), Reduced (18-30 psu), Variable (18-40 psu)
Depth range1-30m
Other preferencesNo text entered
Migration PatternNon-migratory or resident

Habitat Information

-

Life history

Adult characteristics

ParameterData
Reproductive typeOogamous
Reproductive frequency Annual episodic
Fecundity (number of eggs)>1,000,000
Generation timeInsufficient information
Age at maturityInsufficient information
SeasonOctober - December
Life span5-10 years

Larval characteristics

ParameterData
Larval/propagule type-
Larval/juvenile development Spores (sexual / asexual)
Duration of larval stageNot relevant
Larval dispersal potential No information
Larval settlement periodNot relevant

Life history information

Dickinson (1963) suggested a lifespan of 5-6 years but Kain (1984) estimated that 1 in 20 specimens may attain 9 to 16 years of age. All reproductive structures in Delesseria sanguinea are born on the mibribs. The typical life cycle of members of the Ceramiales is summarised as follows:

  • Male haploid gametophytes release male gametes (spermatia) from spermatangia on male bladelets.
  • Female haploid gametophytes produce the female gamete, the carpogonium on female bladelets
  • After fusion (fertilization) the carposporophyte develops, enclosed in a stalked cystocarp and releases diploid carpospores.
  • Carpospores develop into the tetrasporophyte, a diploid sporophyte stage.
  • The sporophyte develops tetrasporangia in which haploid tetraspores are formed by meiosis.
  • The tetraspores develop into gametophytes.

The gametophyte and sporophyte stages in the order Ceramiales are isomorphic (Bold & Wynne, 1978). The onset of sexual reproduction is stimulated by day length, Delesseria sanguinea is a short-day plant sensitive to a night break (Kain, 1991; Kain, 1996]. The male bladelets and spermatangia develop between September and December in the Isle of Man. (Kain, 1993). Cystocarps and tetrasporangia appear from December to March and the carpospores and tetraspores are first released in December. Female carpogonia develop 2-3 months before the carposporophytes (c. September). Tetrasporangia form in response to shorter day length (<10 hour days) than male and female gametangia (Kain, 1996). In culture male bladelets were stimulated by 11-12h days, spermatangia taking 4 weeks to develop. Spermatangia were inhibited by increased day length in culture. Kain (1987) suggested that the southern limit of Delesseria sanguinea may be determined by winter temperatures. Studies in Roscoff and Helgoland showed similar seasonality; new blades formed in April to June at Roscoff, males plants in October to December, cystocarps and tetrasporangia in October to December, the last cystocarps found in April. Juvenile recruitment occurred between February and April or June in both Roscoff and Helgoland (Molenaar & Breeman, 1997).

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

Delesseria sanguinea will be removed with the substratum and it is therefore highly intolerant. There is little information on recruitment or recolonization rates. Kain (1975) examined recolonization of cleared concrete blocks in a subtidal kelp forest. Red algae colonized blocks within 26 weeks in the shallow subtidal (0.8 m) and 33 weeks at 4.4 m. Delesseria sanguinea was noted within 41 weeks (8 months) at 4.4m in one group of blocks and within 56-59 days after block clearance in another group of blocks. This recolonization occurred during winter months following spore release and settlement, but not in subsequent samples (Kain, 1975). This suggests that recolonization of Delesseria sanguinea in new areas is directly dependent on spore availability. Rhodophyceae have non flagellate, and non-motile spores that stick on contact with the substratum. Norton (1992) noted that algal spore dispersal is probably determined by currents and turbulent deposition. However, red algae produce large numbers of spores that may settle close to the adult especially where currents are reduced by an algal turf or in kelp forests. It is likely that this species could recolonize an area from adjacent populations within a short period of time in ideal conditions but that recolonization from distant populations would probably take longer.
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

Adults are up to 30 cm in height and will probably survive smothering to a depth of 5 cm by sediment. However, algal spores and propagules are adversely affected by a layer of sediment, which can exclude up to 98 percent of light (Vadas et al., 1992). Germlings and juveniles are likely to be highly intolerant of smothering. A layer of sediment is likely to interfere with settlement and attachment of spores.
Intermediate High Low 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

The effects of increased siltation on adults is likely to include smothering (above) or increase turbidity and therefore light attenuation (see below). Within kelp forest, current flows are reduced and siltation is likely to be increased. Therefore, Delesseria sanguinea may be tolerant of a level of siltation. Increased siltation may increase sediment scour, especially in winter. Spores, germlings and juveniles are likely to be highly intolerant of sediment scour (Vadas et al., 1992). However, Delesseria sanguinea reproduces in winter and increased siltation may interfere with recruitment and long term survival of the population.
Low Immediate Not sensitive 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

No information
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

Delesseria sanguinea is normally subtidal and unlikely to be exposed to desiccation except at extreme low tides or in exposed rock pools. Strong insolation of 20mW per square cm (comparable to mid day on a cloudless December in the UK) causes significant reduction in photosynthesis in only a few hours (1- 4 hrs) (Drew, 1983). A variety of subtidal red algae can survive aerial exposure for 14 hrs only at humidities of 100 percent (Kain & Norton, 1990). Spores and germlings are highly intolerant of desiccation due to there relatively high surface to area ratios. Subtidal algae are more intolerant of than intertidal algae to desiccation.
High High Moderate Low
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

Delesseria sanguinea is a subtidal species. Increased emergence will extend tidal influence further down the shore. The extent of the population will be decreased accordingly by depressing its height up the shore as a result of increased desiccation, insolation and competition from intertidal algae. Similarly individuals inhabiting rock pools may be lost.
Intermediate 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

Algae are dependent on water flow for a supply of nutrients and removal of wastes. Delesseria sanguinea is found is a wide range of water flow regimes from moderately strong to weak. However, the flow rates experienced within kelp forests will be reduced. Deep growing red algae such as Delesseria sanguinea were observed growing in stagnating water in Kiel Bay, western Baltic Sea (Schwenke, 1960; cited in Kinne, 1971). It is likely, therefore, that this species would tolerate decreased water flow. However, an increase to strong or very strong may inhibit settlement of spores and may remove adults or germlings.
Intermediate High Low Low
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

There is some evidence to suggest that blade growth in Delesseria sanguinea is delayed until ambient sea temperatures fall below 13 °C, although blade growth is likely to be intrinsically linked to gametangia development (see Kain, 1987). Delesseria sanguinea is tolerant of 23 deg C for a week (Lüning, 1984) but dies rapidly at 25 deg C. North Sea and Baltic specimens grew between 0-20 deg C, survived at 23 deg C but died at 25 deg C rapidly (Rietema, 1993). Rietema (1993) reported temperature differences in temperature tolerance between North Sea and Baltic specimens. Lüning (1990) reports optimal growth in Delesseria sanguinea between 10 - 15 deg C and optimal photosynthesis at 20 deg C. However, the upper limit of temperature tolerance is reduced by lowered salinity in Baltic specimens (Kinne, 1970; Kain & Norton, 1990). At low salinity photosynthesis is restricted to a narrow range of temperatures in adult thalli whereas juvenile thalli have a wider response range (Lobban & Harrison, 1997; fig 6.27). It is likely therefore that within the subtidal an increase in temperature of 2 deg C in the long term will have limited effect on survival, although it may affect initiation of new growth at the southern limits of the population. An increase of 5 deg C in the short term may affect survival if the ambient temperature is increased above 23 deg C.
Low Immediate Not sensitive Moderate
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

Temperate, sub-tidal red algae are characterised by high rates of photosynthetic saturation, high maximum rates of photosynthesis and rapid growth. Reproduction in some species, triggered by short days, during winter when growth of other algae is limited, increased wave action results in loss of algae and most space is available for recolonization (Kain & Norton, 1990). Red algae possess only trace amounts of chlorophyll a (Lüning & Schmitz, 1988). Their main photosynthetic pigments are phycobiliproteins, which absorb optimally in the green light of deeper coastal waters. Photosynthesis in Delesseria sanguinea is inhibited by high light levels >200 µmol/m²/s, roughly equivalent to very clear shallow water in summer (Kain & Norton, 1990; Figure 15-2). However, in turbid coastal waters, where green light prevails, photosynthetic effectiveness increases with depth in red algae rich in phycoerythrin such as Delesseria sanguinea (Lüning, 1990). Delesseria sanguinea can grow in darkness using energy reserves stored in the stipe or lower regions of the frond ribs (Lüning, 1990). Increased turbidity would decrease the light levels at depth and may reduce the effective day length and induce reproduction earlier than in less turbid areas (Kain & Norton, 1990). Delesseria sanguinea is adapted to grow at depth or in the shade of other plants. Long term (years) decreased turbidity may restrict its downward extent. Short term changes may affect growth and reproduction, however, as a perennial, the adults will probably survive.
Tolerant Not relevant Not sensitive Moderate
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

Delesseria sanguinea occurs on coasts with a wide range of wave exposures, from very exposed to very sheltered and are therefore unlikely to be intolerant of changes in wave action. The plants are sheltered from the worst effects of wave action by depth or dominant kelps.
Tolerant Not relevant Not sensitive Moderate
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

Plants have no known sound or vibration receptors
Tolerant Not relevant Not sensitive Not relevant
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

Marine algae have no known response to visual stimuli.
Tolerant Not relevant Not sensitive Not relevant
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

Little information is available on the effects of abrasion on sub tidal red algae. However, the growth form of Delesseria sanguinea suggests that its lamina would probably be damaged by passing fishing gear, such as a scallop dredge (see benchmark). Although, its lamina is flexible a proportion of the population is likely to be torn off and lost. Specimens attached to cobbles or boulders may be removed (see substratum loss above). Therefore, an intolerance of intermediate has been recorded.
Intermediate High 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

If Delesseria sanguinea is removed from the substratum it can not reattach itself and it is therefore highly intolerant. Kain (1975) examined recolonization of cleared concrete blocks in a subtidal kelp forest. Red algae colonized blocks within 26 weeks in the shallow subtidal (0.8 m) and 33 weeks at 4.4 m. Delesseria sanguinea was noted within 41 weeks (8 months) at 4.4 m in one group of blocks and within 56-59 days in blocks cleared at two monthly intervals during winter months, but not in subsequent samples (Kain, 1975). This suggests that Delesseria sanguinea can recolonize areas, but is directly dependent on its reproductive season and spore availability. Rhodophyceae have non flagellate, and non-motile spores that stick on contact with the substratum. Norton (1992) noted that algal spore dispersal is probably determined by currents and turbulent deposition. However, red algae produce large numbers of spores that may settle close to the adult especially where currents are reduced by an algal turf or in kelp forests. It is likely that this species could recolonize an area from adjacent populations within a short period of time in ideal conditions but that recolonization from distant populations would probably take longer.
High High Moderate Moderate

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

O'Brien & Dixon (1976) suggested that red algae were the most sensitive group of algae to oil or dispersant contamination, possibly due to the susceptibility of phycoerythrins to destruction, and that the filamentous forms were the most sensitive. However, most evidence relates to dispersants. O'Brien & Dixon (1976) also report that red algae are effective indicators of detergent damage since they undergo colour changes when exposed to relatively low concentration of detergent. Smith (1968) reported that 10 ppm of the detergent BP 1002 killed the majority of specimens in 24hrs in toxicity tests. However, the effects take several days to manifest; when killed the lamina turn bright orange. Heavy mortality of Delesseria sanguinea occurred down to 12 m after the 'Torrey Canyon' oil spill (probably due to a mixture of wave action and dispersant application). Laboratory studies of the effects of oil and dispersants on several red algae species, including Delesseria sanguinea (Grandy, 1984; cited in Holt et al., 1995) concluded that they were all sensitive to oil/ dispersant mixtures, with little differences between adults, sporelings, diploid or haploid life stages. Cole et al. (1999) suggested that herbicides , such as simazina and atrazine were very toxic to macrophytes. Hoare & Hiscock (1974) noted that Delesseria sanguinea was excluded from Amlwch Bay, Anglesey by acidified halogenated effluent discharge. Holt et al. (1995) concluded that Delesseria sanguinea is probably generally sensitive to chemical contamination.
High High Moderate High
Heavy metal contamination [Show more]

Heavy metal contamination

Evidence

Bryan (1984) suggested that the general order for heavy metal toxicity in seaweeds is: Organic Hg > inorganic Hg > Cu > Ag > Zn > Cd > Pb. Cole et al. (1999) reported that Hg was very toxic to macrophytes. The sub-lethal effects of Hg (organic and inorganic) on Plumaria elegans sporeling were reported by Boney (1971), for example 100 percent growth inhibition was caused by 1 ppm Hg in his study. However, little information concerning the effects of heavy metals on Delesseria sanguinea was found. Heavy metals have the potential to accumulate in plant tissue, therefore it may take some time for tissue levels to fall before recovery can begin.
Low Very high Very Low Low
Hydrocarbon contamination [Show more]

Hydrocarbon contamination

Evidence

Delesseria sanguinea is unlikely to become smothered by oil due to its subtidal position. However, O'Brien & Dixon (1976) suggested that red algae were the most sensitive group to oil or dispersant contamination, possibly due to the susceptibility of phycoerythrins to destruction, and that the filamentous forms were the most intolerant. Heavy mortality of Delesseria sanguinea occurred down to 12 m after the 'Torrey Canyon' oil spill, although it was unclear how much of the effect was due to oil rather than dispersant contamination. Laboratory studies of the effects of oil and dispersants on several red algae species, including Delesseria sanguinea (Grandy, 1984; cited in Holt et al., 1995) concluded that they were all sensitive to oil/ dispersant mixtures, with little differences between adults, sporelings, diploid or haploid life stages. Holt et al. (1995) concluded that Delesseria sanguinea is probably generally sensitive to chemical contamination.
High High Moderate High
Radionuclide contamination [Show more]

Radionuclide contamination

Evidence

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

Changes in nutrient levels

Evidence

Kain (1984) noted that growth of blades continued into July and August. Delesseria sanguinea can grow new blades in darkness by drawing on reserves held in frond midrib and stipe (Lüning, 1990), suggesting that nutrients are subject to 'luxury' accumulation in the winter months. Delesseria sanguinea is likely to tolerate low nutrient levels, during spring and summer. An increase in abundance of red algae, including Delesseria sanguinea, was associated with eutrophication in the Skagerrak area, Sweden, especially in areas with the most wave exposure or water exchange (Johansson et al., 1998). However, where eutrophication resulted in high siltation rates, the delicate foliose red algae such as Delesseria sanguinea were replaced by tougher, erect red algae (Johansson et al., 1998). High nutrient levels and eutrophication may result in increased siltation and turbidity (see above). Although increased nutrients may stimulate growth, this species may be out competed by green algae and epiphytes at the upper reaches of its range where light is less limiting.
Low Immediate Not sensitive 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

Salinity and temperature affect photosynthesis. At low salinities photosynthesis in adults occurs in a restricted temperature range, although juvenile thalli photosynthesise across a wider range of temperatures (Lehnberg, 1978; cited in Lobban & Harrison, 1997). Rietema (1993) examined ecotypic differences between North Sea and Baltic populations of Delesseria sanguinea. Optimal growth occurred in Baltic specimens at 19 -23 psu and North Sea specimens at 33 psu. North Sea specimens died at 7.5 - 11 psu. Optimal photosynthesis occurred at full salinity, even in specimens collected from 15 psu (Lehnberg, 1978; cited in Lobban & Harrison, 1997). Increased salinity at 40 psu drastically reduced photosynthesis in Baltic specimens (Kinne, 1971). Delesseria sanguinea is likely to tolerate reduced salinity, although growth and reproduction may be reduced in low salinity environments when compared to full salinity.
Low Immediate Not sensitive 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

The effects of deoxygenation in plants has been little studied. Since plants produce oxygen they may be considered relatively insensitive. However, a study of the effects of anaerobiosis (no oxygen) on some marine algae concluded that Delesseria sanguinea was very intolerant of anaerobic conditions; at 15 deg C death occurs within 24hrs and no recovery takes place although specimens survived at 5 deg C. (Hammer, 1972).
High High Moderate 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

No reference to diseases of red algae was found in the literature.
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 non-native species were identified that compete with Delesseria sanguinea.
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 has been collected, by the French company GoËmar for cosmetic purposes, although knowledge of this trend continuing is unknown. Additionally sheep, on North Ronaldsay of the Orkneys have been known to graze on this species of algae.
Not relevant Not relevant Not relevant Not relevant
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

Extraction or harvesting of kelp will increased light penetration and is likely to enhance growth. Kain (1975) showed that red algae recolonized cleared concrete blocks, in kelp forest in the Isle of Man; Delesseria sanguinea colonizing within 56-59 days. This suggests that extraction of kelp may encourage growth of this species in the short term until the kelp species dominate again.
Tolerant* Not relevant Not sensitive* Low

Additional information

Importance review

Policy/legislation

- no data -

Status

Non-native

ParameterData
Native-
Origin-
Date Arrived-

Importance information

Delesseria sanguinea is used in the cosmetics industry for its anticoagulant properties and vitamin K content; the active principle being termed delesserine (Guiry & Blunden, 1991).

Bibliography

  1. Bold, H.C. & Wynne, M.J., 1978. Introduction to the algae: structure and reproduction. New-Jersey: Prentice-Hall, Inc.

  2. Boney, A.D., 1971. Sub-lethal effects of mercury on marine algae. Marine Pollution Bulletin, 2, 69-71.

  3. Dickinson, C.I., 1963. British seaweeds. London & Frome: Butler & Tanner Ltd.

  4. Drew, E.A., 1983. Light. In Sublittoral ecology: The ecology of the shallow sublittoral benthos, (ed. R. Earll & D.G. Erwin). Oxford: Clarendon Press.

  5. Guiry, M.D. & Blunden, G., 1991. Seaweed Resources in Europe: Uses and Potential. Chicester: John Wiley & Sons.

  6. Hammer, L., 1972. Anaerobiosis in marine algae and marine phanerograms. In Proceedings of the Seventh International Seaweed Symposium, Sapporo, Japan, August 8-12, 1971 (ed. K. Nisizawa, S. Arasaki, Chihara, M., Hirose, H., Nakamura V., Tsuchiya, Y.), pp. 414-419. Tokyo: Tokyo University Press.

  7. Hardy, F.G. & Guiry, M.D., 2003. A check-list and atlas of the seaweeds of Britain and Ireland. London: British Phycological Society

  8. Hiscock, S., 1986b. A field key to the British Red Seaweeds. Taunton: Field Studies Council. [Occasional Publication No.13]

  9. 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.

  10. JNCC (Joint Nature Conservation Committee), 1999. Marine Environment Resource Mapping And Information Database (MERMAID): Marine Nature Conservation Review Survey Database. [on-line] http://www.jncc.gov.uk/mermaid

  11. Johansson ,G., Eriksson, B.K., Pedersen, M. & Snoeijs, P., 1998. Long term changes of macroalgal vegetation in the Skagerrak area. Hydrobiologia, 385, 121-138.

  12. Kain, J.M., & Bates, M.J., 1993. The reproductive phenology of Delesseria sanguinea and Odonthalia dentata off the Isle of Man. European Journal of Phycology, 28, 173-182

  13. Kain, J.M., & Norton, T.A., 1990. Marine Ecology. In Biology of the Red Algae, (ed. K.M. Cole & Sheath, R.G.). Cambridge: Cambridge University Press.

  14. Kain, J.M., 1975a. Algal recolonization of some cleared subtidal areas. Journal of Ecology, 63, 739-765.

  15. Kain, J.M., 1982. The reproductive phenology of nine species of the Rhodophycota in the subtidal region of the Isle of Man. British Phycological Journal, 17, 321-331.

  16. Kain, J.M., 1987. Photoperiod and temperature as triggers in the seasonality of Delesseria sanguinea. Helgolander Meeresuntersuchungen, 41, 355-370.

  17. Kain, J.M., 1991. The dithering males of Delesseria. British Phycological Journal, 26, 90.

  18. Kain, J.M., 1996. Photoperiodism in Delesseria sanguinea (Ceramiales, Rhodophyta) 1. The phases and sexes differ. Phycologia, 35, 446-455.

  19. Kinne, O. (ed.), 1970. Marine Ecology: A Comprehensive Treatise on Life in Oceans and Coastal Waters. Vol. 1 Environmental Factors Part 1. Chichester: John Wiley & Sons

  20. Kinne, O. (ed.), 1971a. Marine Ecology: A Comprehensive, Integrated Treatise on Life in Oceans and Coastal Waters. Vol. 1 Environmental Factors, Part 2. Chichester: John Wiley & Sons.

  21. Kühl, H., 1981. The sand gaper Mya arenaria. In Invertebrates of the Wadden Sea. Final report of the section 'Marine Zoology' of the Wadden Sea Working Group, (ed. N. Dankers, H. Kuhl, W.J., Wolff), pp. 118-119.

  22. Lobban, C.S. & Harrison, P.J., 1997. Seaweed ecology and physiology. Cambridge: Cambridge University Press.

  23. Lüning, K., & Schmitz, K., 1988. Dark growth of the red algae Delesseria sanguinea, (Cerimales): lack of chlorophyll, photosynthetic capability, and phycobilisomes. Phycologia,27, 72-77

  24. Lüning, K., 1984. Temperature tolerance and biogeography of seaweeds: the marine algal flora of Helgoland (North Sea) as an example. Helgolander Meeresuntersuchungen, 38, 305-317.

  25. Maggs, C.A. & Hommersand, M.H., 1993. Seaweeds of the British Isles: Volume 1 Rhodophycota Part 3A Ceramiales. London: Natural History Museum, Her Majesty's Stationary Office.

  26. Molenaar, F.J. & Breeman, A.M., 1997. Latitudinal trends in the growth and reproductive seasonality of Delesseria sanguinea, Membranoptera alata, and Phycodrys rubens (Rhodophyta). Journal of Phycology, 33, 330-343.

  27. Norton, T.A. (ed.), 1985. Provisional Atlas of the Marine Algae of Britain and Ireland. Huntingdon: Biological Records Centre, Institute of Terrestrial Ecology.

  28. Norton, T.A., 1992. Dispersal by macroalgae. British Phycological Journal, 27, 293-301.

  29. Picton, B.E. & Costello, M.J., 1998. BioMar biotope viewer: a guide to marine habitats, fauna and flora of Britain and Ireland. [CD-ROM] Environmental Sciences Unit, Trinity College, Dublin.

  30. Rietema, H., 1993. Ecotypic differences between Baltic and North Sea populations of Delesseria sanguinea and Membranoptera alata. Botanica Marina, 36, 15-21.

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

  32. South, G.R. & Tittley, I., 1986. A Checklist and Distributional Index of the Benthic Marine Algae of the North Atlantic Ocean. London: British Museum (Natural History).

  33. Vadas, R.L., Johnson, S. & Norton, T.A., 1992. Recruitment and mortality of early post-settlement stages of benthic algae. British Phycological Journal, 27, 331-351.

Datasets

  1. 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.

  2. 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

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

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. Manx Biological Recording Partnership, 2018. Isle of Man historical wildlife records 1990 to 1994. Occurrence dataset:https://doi.org/10.15468/aru16v accessed via GBIF.org on 2018-10-01.

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

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

  13. OBIS (Ocean Biodiversity Information System),  2024. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2024-05-28

  14. Outer Hebrides Biological Recording, 2018. Non-vascular Plants, Outer Hebrides. Occurrence dataset: https://doi.org/10.15468/goidos accessed via GBIF.org on 2018-10-01.

  15. Royal Botanic Garden Edinburgh, 2018. Royal Botanic Garden Edinburgh Herbarium (E). Occurrence dataset: https://doi.org/10.15468/ypoair accessed via GBIF.org on 2018-10-02.

  16. South East Wales Biodiversity Records Centre, 2018. SEWBReC Algae and allied species (South East Wales). Occurrence dataset: https://doi.org/10.15468/55albd accessed via GBIF.org on 2018-10-02.

  17. 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:

Tyler-Walters, H., 2006. Delesseria sanguinea Sea beech. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 28-05-2024]. Available from: https://marlin.ac.uk/species/detail/1338

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Last Updated: 09/11/2006