|Researched by||Jacqueline Hill||Refereed by||Prof. Steve J. Hawkins|
|Other common names||-||Synonyms||-|
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.
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|Phylum||Mollusca||Snails, slugs, mussels, cockles, clams & squid|
|Class||Gastropoda||Snails, slugs & sea butterflies|
|Typical abundance||High density|
|Male size range||<60mm|
|Male size at maturity||16-25mm|
|Female size range||Small-medium(3-10cm)|
|Female size at maturity|
|Characteristic feeding method||Active suspension feeder|
|Typically feeds on||Wide range of micro-organisms and algae, including Fucus spp., germlings, other algal sporelings and encrusting red algae.|
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.
Female size at maturity
The species is protandric. Females are generally larger although small females are occasionally found. (Orton et al., 1956).
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 under water. Under thick fucoid covering or when conditions are damp, individuals may be found on the move after the tide has fallen.
|Physiographic preferences||Open coast, Strait / sound, Estuary, Enclosed coast / Embayment|
|Biological zone preferences||Lower eulittoral, Mid eulittoral, Upper eulittoral|
|Substratum / habitat preferences||Artificial (man-made), Bedrock, Cobbles, Crevices / fissures, Large to very large boulders, Overhangs, Pebbles, Rockpools, Small boulders|
|Tidal strength preferences||Moderately 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 preferences||Exposed, Extremely exposed, Extremely sheltered, Moderately exposed, Sheltered, Ultra sheltered, Very exposed, Very sheltered|
|Salinity preferences||Full (30-40 psu), Reduced (18-30 psu), Variable (18-40 psu)|
|Other preferences||No text entered|
|Migration Pattern||Diel, Seasonal (environment)|
The upper limit of distribution on a shore is increased by shade and exposure. In some situations seasonal variations 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 which 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 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).
|Reproductive type||Protandrous hermaphrodite|
|Reproductive frequency||See additional information|
|Fecundity (number of eggs)||No information|
|Generation time||2-5 years|
|Age at maturity||Matures as a male at about 9 months of age and then can change to female at 2-3 years of age.|
|Season||See additional text|
|Life span||11-20 years|
|Duration of larval stage||2-10 days|
|Larval dispersal potential||Greater than 10 km|
|Larval settlement period||Insufficient information|
This MarLIN sensitivity assessment has been superseded by the MarESA approach to sensitivity assessment. MarLIN assessments used an approach that has now been modified to reflect the most recent conservation imperatives and terminology and are due to be updated by 2016/17.
|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).|
|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.|
|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.|
|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.|
|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).|
|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).|
|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.|
|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||Very high||Very Low||Low|
|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.|
|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.|
|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).|
|Tolerant||Not relevant||Not sensitive||Low|
|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.|
|Low||Very high||Very Low||Very low|
|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.|
|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'.|
|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.|
|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).|
|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.|
|No information||No information||No information||Not relevant|
|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.|
|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).|
|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.|
|No information||No information||No information||Not relevant|
|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.|
|Not relevant||Not relevant||Not relevant||Not relevant|
|No known non-native species compete with Patella vulgata.|
|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).|
|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.|
- no data -
|National (GB) importance||-||Global red list (IUCN) category||-|
Culinary use Collection of limpets for culinary use is on a local scale.
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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.
Lancashire Environment Record Network, 2018. LERN Records. Occurrence dataset: https://doi.org/10.15468/esxc9a accessed via GBIF.org on 2018-10-01.
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.
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.
Merseyside BioBank., 2018. Merseyside BioBank (unverified). Occurrence dataset: https://doi.org/10.15468/iou2ld accessed via GBIF.org on 2018-10-01.
National Trust, 2017. National Trust Species Records. Occurrence dataset: https://doi.org/10.15468/opc6g1 accessed via GBIF.org on 2018-10-01.
NBN (National Biodiversity Network) Atlas. Available from: https://www.nbnatlas.org.
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.
OBIS (Ocean Biogeographic Information System), 2019. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2019-03-21
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.
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.
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
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.
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.
Yorkshire Wildlife Trust, 2018. Yorkshire Wildlife Trust Shoresearch. Occurrence dataset: https://doi.org/10.15468/1nw3ch accessed via GBIF.org on 2018-10-02.
This review can be cited as:
Last Updated: 29/05/2008