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information on the biology of species and the ecology of habitats found around the coasts and seas of the British Isles

Novocrania anomala and Protanthea simplex on sheltered circalittoral rock

03-04-2018

Summary

UK and Ireland classification

Description

This biotope typically occurs in full to variable salinity conditions on very wave-sheltered circalittoral bedrock and boulder slopes subject to negligible tidal streams (this tends to be in the landward, very sheltered basins of fjordic sealochs). This biotope is characterized by often dense populations of the anemone Protanthea simplex, growing on the silty bedrock. The underlying rock surfaces are usually covered by encrusting red algae, the polychaete Spirobranchus triqueter, the brachiopods Novocrania anomala and Terebratulina retusa, the saddle oyster Pododesmus patelliformis and the polychaete Sabella pavonina. Scattered colonies of Alcyonium digitatum and the hydroid Bougainvillia ramosa may occasionally be recorded. A diverse range of ascidians including Ciona intestinalis, Ascidia mentula, Corella parallelogramma, Ascidia virginea, Polycarpa pomaria and Dendrodoa grossularia are also occasionally recorded. Echinoderms such as the common brittlestar Ophiothrix fragilis are frequently reported with their arms protruding from crevices in the rock, whilst the starfish Asterias rubens, Henricia oculata, and the sea urchin Echinus esculentus and Psammechinus miliaris are occasionally found on the boulder/rock surface. The whelk Buccinum undatum is often present but in very low numbers. The squat lobster Munida rugosa may be seen hiding in crevices. The hermit crab Pagurus bernhardus may also be recorded. (Information from JNCC, 2014).

Depth range

5-10 m, 10-20 m, 20-30 m, 30-50 m

Additional information

CR.LCR.BrAS.NeoPro includes two sub-biotopes (NeoPro.FS and NeoPro.VS) depending on the salintiy regime. Both are found in simialr physical habitats but Dendrodoa grossularia becomes common is the variable salinity sub-biotope (NeoPro.VS) and Protanthea simplex exhibits a higher abundance in the full salinty sub-biotope (NeoPro.FS) (JNCC, 2014).

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Habitat review

Ecology

Ecological and functional relationships

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Seasonal and longer term change

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Habitat structure and complexity

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Productivity

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Recruitment processes

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Time for community to reach maturity

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Additional information

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Preferences & Distribution

Habitat preferences

Depth Range 5-10 m, 10-20 m, 20-30 m, 30-50 m
Water clarity preferencesPoor clarity / Extreme turbidity, Very high clarity / Very low turbidity, See additional information
Limiting Nutrients Data deficient
Salinity preferences Full (30-40 psu)
Physiographic preferences Enclosed coast / Embayment
Biological zone preferences Circalittoral
Substratum/habitat preferences Bedrock, Large to very large boulders, Small boulders
Tidal strength preferences Very Weak (negligible), Weak < 1 knot (<0.5 m/sec.)
Wave exposure preferences Extremely sheltered, Sheltered, Very sheltered
Other preferences

Additional Information

The two sub-biotopes included within this assessment are characterized by variable, reduced or low salinity which may influence biotope structure. The two sub-biotopes have some similarities although SCR.NeoPro.Den is more species rich and may occur in more open lochs (so far it has only been recorded from Loch Etive). The temperature preferences of the individual species selected to represent the biotope are quite different to the temperatures in which the biotope occurs in Britain and Ireland. For instance, Ciona intestinalis has a world-wide distribution and optimal growth occurs at between 15-20 degrees C, considerably higher than water temperatures on the west coast of Scotland. Protanthea simplex extends further north into colder waters. No information is available regarding limiting nutrients.

Species composition

Species found especially in this biotope

    Rare or scarce species associated with this biotope

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    Additional information

    The biotope assessment also covers two sub-biotopes. Ciona intestinalis is not one of the characterizing species in SCR.NeoPro.CaTw. However, Ciona intestinalis is assumed to form a suitable surrogate, representing the sensitivity of the various other solitary ascidians in the sub-biotope.

    Sensitivity review

    Explanation

    There are no species in this biotope that can be classified as 'key', i.e. species that if lost would result in loss or degradation of the associated community. Three important characterizing species have been selected that are important for the classification of this biotope. The biotope name includes Neocrania anomala and Protanthea simplex so these have been included. The parent biotope complex is 'Brachiopod and solitary ascidian communities (sheltered rock)' Ciona intestinalis has been included as a representative solitary ascidian that is found with high frequency in the biotope. The very large solitary ascidian Ascidia mentula was also recorded in more than half the of the records of this biotope although less information was available on this species with which to assess sensitivity.

    Species indicative of sensitivity

    Community ImportanceSpecies nameCommon Name
    Important characterizingCiona intestinalisA sea squirt
    Important characterizingProtanthea simplexSealoch anemone

    Physical Pressures

     IntoleranceRecoverabilitySensitivitySpecies RichnessEvidence/Confidence
    High Moderate Moderate Major decline Low
    All three important characterizing species are highly intolerant of substratum loss. The slower growing and longer lived Neocrania anomala will probably be the limiting factor in the recovery of the biotope although both Neocrania anomala and Protanthea simplex have moderate recoverability.
    High Moderate Moderate Major decline Moderate
    Both Neocrania anomala and Protanthea simplex are highly intolerant of smothering. Ciona intestinalis, being also recorded from areas of modified substratum and high siltation is more tolerant but still intermediately intolerant. The slower growing and longer lived Neocrania anomala will probably be the limiting factor in the recovery of the biotope although both Neocrania anomala and Protanthea simplex have moderate recoverability.
    Low Very high Very Low Minor decline Moderate
    All three of the selected important characterizing species have low intolerance to siltation. Neocrania anomala and Protanthea simplex have very high recoverability from siltation.
    Not relevant Not relevant Not relevant Not relevant High
    The deeper water location (greater than 10 m) of this biotope means that desiccation is highly unlikely to be a relevant factor.
    Not relevant Not relevant Not relevant Not relevant High
    The deep water location (greater than 10 m) of this biotope means that exposure to an emergence regime is highly unlikely to be a relevant factor.
    High Moderate Moderate Major decline Low
    The biotope occurs in the landward basins of fjordic sea lochs where water flow rate is likely to be low. Increases in flow rate may cause high intolerance in Neocrania anomala and intermediate intolerance in Protanthea simplex. The slower growing and longer lived Neocrania anomala will probably be the limiting factor in the recovery of the biotope.
    High Moderate Moderate Major decline Low
    Protanthea simplex has high intolerance to long term chronic temperature increases. The biotope has a restricted distribution along the west coast of Scotland. Long term increases in temperature will cause a decrease in available suitable habitat. Ciona intestinalis may be intermediately intolerant of short term acute decreases in temperature and Neocrania anomala may be intermediately intolerant of short term acute increases in temperature. Intolerance in the lower salinity biotopes where Protanthea simplex is absent may be different. The moderate recoverability of Protanthea simplex from temperature change is likely to be the slowest part of biotope recovery.
    Tolerant Not relevant Not relevant No change Low
    None of the selected important characterizing species from this biotope are intolerant of changes in turbidity.
    Not relevant Not relevant Not relevant Not relevant Moderate
    The selected important characterizing species in this biotope may have high or intermediate intolerance to wave exposure. However, the circalittoral and highly sheltered location of the biotope means that changes in wave exposure are extremely unlikely so the factor has been assessed as not relevant.
    Tolerant Not relevant Not relevant No change High
    Neocrania anomala has low intolerance to noise vibrations but overall the biotope is unlikely to be sensitive to disturbance by noise.
    Tolerant Not relevant Not relevant No change High
    Neocrania anomala has a shadow reflex that causes the valves to clamp shut giving a low intolerance to visual presence but overall, the biotope is unlikely to be sensitive to visual presence.
    High Moderate Moderate Major decline High
    Erect epifaunal species are particularly vulnerable to physical disturbance. Hydroids and bryozoans are likely to be removed or damaged by bottom trawling or dredging (Holt et al., 1995). Veale et al. (2000) reported that the abundance, biomass and production of epifaunal assemblages decreased with increasing fishing effort. Hydroid and bryozoan matrices were reported to be greatly reduced in fished areas (Jennings & Kaiser, 1998 and references therein). Damage to emergent epifauna was the first sign of damage from scallop dredging on horse mussel beds (see Modiolus modiolus) (Service & Magorrian, 1997; Service, 1988; Magorrian & Service, 1998). For example, Protanthea simplex and Ciona intestinalis were both considered to be highly intolerant of physical disturbance and abrasion (see species reviews). The growth form and more durable nature of the valves of Neocrania anomala suggested an intermediate intolerance. Given the likely intolerance of epifaunal communities, an overall intolerance of high has been suggested.

    The recolonization of epifauna on vertical rock walls was investigated by Sebens (1985, 1986). He reported that rapid colonizers such as encrusting corallines, encrusting bryozoans, amphipods, and tubeworms recolonized within 1-4 months. Ascidians such as Dendrodoa carnea, Molgula manhattensis and Aplidium spp. achieved significant cover in less than a year, and, together with Halichondria panicea, reached pre-clearance levels of cover after 2 years. A few individuals of Alcyonium digitatum and Metridium dianthus colonized within 4 years (Sebens, 1986). Large sponges and sea anemones would probably take longer to reach pre-clearance levels. Therefore, a recoverability of moderate has been recorded.

    High Moderate Moderate Major decline High
    Neocrania anomala individuals are cemented to the substratum and cannot reform an attachment if displaced from the substratum. Ciona intestinalis has some limited ability to reform attachments following displacement. The slower growing and longer lived Neocrania anomala will probably be the limiting factor in the recovery of the biotope.

    Chemical Pressures

     IntoleranceRecoverabilitySensitivityRichnessEvidence/Confidence
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    Heavy metal contamination
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    Hydrocarbon contamination
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    Radionuclide contamination
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    Changes in nutrient levels
    Tolerant Not relevant Not relevant No change Moderate
    There is some evidence that increased levels of organic nutrients is of benefit to Ciona intestinalis populations (Naranjo et al., 1996). Dissolved organic matter can also form a nutrition component for other species such as sponges. It is unlikely that changes in nutrient levels will have much effect on the biotope.
    Intermediate High Low Decline Low
    The biotope SCR.NeoPro contains Protanthea simplex which has intermediate intolerance to decreases in salinity. The sea loch anemone may only survive in fully saline waters as it is not found in the two similar sub-biotopes where salinity is variable, reduced or low. Reductions in salinity in the biotope may cause this species to be lost, changing the biotope. The two sub-biotopes A4.3142 and SCR.NeoPro.CaTw are characterized by low/reduced and variable salinity respectively. In SCR.NeoPro.Den, increases in salinity may cause high intolerance. Recoverability of SCR.NeoPro based on the recoverability of Protanthea simplex from change in salinity is high. However, in the sub-biotopes, where Protanthea simplex is absent recoverability may be different.
    Intermediate High Low Decline Low
    Protanthea simplex has intermediate intolerance to decreases in oxygen concentration. In the sub-biotopes where the sea loch anemone does not occur changes in oxygenation may have different effects. Brachiopods can sustain anaerobic metabolism for 3-5 days although at low oxygen concentrations, activity may be reduced. It is likely that characterizing species other than the three selected for the assessment are intolerant of decreases in oxygenation. Cole et al. (1999) suggest possible adverse effects on marine species below 4 mg/l and probable adverse effects below 2mg/l. Recoverability of SCR.NeoPro based on the recoverability of Protanthea simplex and Neocrania anomala from change in oxygenation is likely to be high. However, in the sub-biotopes, where Protanthea simplex is absent, recoverability may be different.

    Biological Pressures

     IntoleranceRecoverabilitySensitivityRichnessEvidence/Confidence
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    No information No information No information Insufficient
    information
    Not relevant
    Insufficient
    information
    Not relevant Not relevant Not relevant Not relevant Low
    It is extremely unlikely that any of the species indicative of sensitivity would be targeted for extraction and we have no evidence for the indirect effects of extraction of other species on this biotope.
    Not relevant Not relevant Not relevant Not relevant Low

    Additional information

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    Citation

    This review can be cited as:

    Readman, J.A.J. & Jackson, A. 2016. [Novocrania anomala] and [Protanthea simplex] on sheltered circalittoral rock. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 19-06-2018]. Available from: https://www.marlin.ac.uk/habitat/detail/5

    Last Updated: 31/03/2016