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Spatial, Temporal and Tidal Variation in Crab Populations in the Forth Estuary, Scotland

Published online by Cambridge University Press:  11 May 2009

S. Mathieson  and
A.J. Berry
S. Mathieson
Affiliation:
Research and Advisory Services Directorate, Scottish Natural Heritage, 2 Anderson Place, Edinburgh, EH6 5NP.
A.J. Berry
Affiliation:
department of Biological and Molecular Sciences, University of Stirling, Stirling, FK9 4LA
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Extract

Five species of crabs were recorded in the Forth Estuary, of which Liocarcinus depurator and Cancer pagurus were confined to the lowest reaches where salinities are 24–35%‰. Carcinus maenas, Liocarcinus holsatus and Hyas araneus also occurred in the middle estuary where salinities are 22–31%‰ in summer but often fall to ~12%‰ in winter. A very few L. depurator and Cancer pagurus were confined to the lower estuary and mostly occurred in low tide trawls in summer. Carcinus maenas alone was recorded much further up the estuary where salinities rarely exceed 0–5·7%‰. Carcinus maenas predominated numerically throughout with an overall mean density of 0·0075 m−2 in the middle and lower estuary. Carcinus maenas in the estuary channel measured 16·6–82·9 mm carapace width (CW) with a modal size–class of 50–60 mm. Males were outnumbered by females (0·68:1 overall), and more markedly in summer than winter. Yet males were significantly bigger on average than females. Egg-masses were borne by 7·5% of all trawled females, but by 31·1% in April–May. On adjacent shores, by contrast, the much higher numbers of C. maenas were nearly all <20 mm CW. Low water trawls yielded significantly more C. maenas, but significantly lower proportions of males, than high water trawls. Liocarcinus holsatus was most abundant within the mid-lower estuary basin, with numbers decreasing both upstream and at the estuary mouth. Males outnumbered females by 2·26:1 overall, and most markedly at the extremities of the range. Males were significantly bigger than females, although sizes of both generally increased towards the mouth of the estuary. Only three of the 101 females bore eggs. Low water trawls yielded slightly more L. holsatus than high water trawls. Numbers of H. araneus increased markedly from mid-estuary to the estuary mouth where counts averaged 0·0021 m−2. Males outnumbered females by 2·17:1, and more so among those >40 mm CW. No female bore eggs. Records of the presence of C. maenas, Liocarcinus sp. and Hyas sp. all increased in the estuary from 1985 to 1995 reflecting increases in intertidal faunal diversity and changes in industrial practices since the early 1980s.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 77 , Issue 1 , February 1997 , pp. 167 - 183
Copyright
Copyright © Marine Biological Association of the United Kingdom 1997

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References

Aagaard, A., Warman, C.G. & Depledge, M.H., 1995. Tidal and seasonal changes in the temporal and spatial distribution of foraging Carcinus maenas in the weakly tidal littoral zone of Kerteminde Fjord, Denmark. Marine Ecology Progress Series, 122, 165–172.CrossRefGoogle Scholar
Allen, J.A., 1967. The fauna of the Clyde Sea area. Crustacea: Euphausiacea and Decapoda with an illustrated key to the British species. Millport, Scotland: Scottish Marine Biological Association, Millport.Google Scholar
Almaça, C., 1979. Note sur la biologie des populations de Carcinus maenas (L.) de la zone intertidale du Portugal occidental. Quaderni del Eaboratorio di Tecnologica della Pesca. Ancona, 3, 179–185.Google Scholar
Atkinson, R.A. & Parsons, A.J., 1973. Seasonal patterns of migration and locomotor rhythmicity in populations of Carcinus. Netherlands Journal of Sea Research, 7, 81–93.CrossRefGoogle Scholar
Basford, D.J., Eleftheriou, A. & Raffaelli, D., 1989. The epifauna of the northern North Sea (56°–61°N). Journal of the Marine Biological Association of the United Kingdom, 69, 387–07.CrossRefGoogle Scholar
Berrill, M., 1982. The life cycle of the green crab Carcinus maenas at the northern end of its range. Journal of Crustacean Biology, 2, 31–39.CrossRefGoogle Scholar
Choy, S.C., 1988. Reproductive biology of Liocarcinus puber and L. holsatus (Decapoda, Brachyura, Portunidae) from the Gower peninsula, South Wales. Marine Ecology. Pubblicazioni della Stazione Zoologica de Napoli I, 9, 227–241.CrossRefGoogle Scholar
Crothers, J. & Crothers, M., 1988. A key to the crabs and crab-like animals of British inshore waters. London: Field Studies Council. [Reprinted with minor alterations from Field Studies, (1983) 5, 753–806.]Google Scholar
Crothers, J.H., 1967. The biology of the shore crab Carcinus maenas (L.). 1. The background – anatomy, growth and life history. Field Studies, 2, 407–434.Google Scholar
Crothers, J.H., 1969. The distribution of crabs in Dale Roads (Milford Haven: Pembrokeshire) during summer. Field Studies, 3, 109–124.Google Scholar
Dare, P.J. & Edwards, D.B., 1981. Underwater television observations on the intertidal movements of shore crabs, Carcinus maenas, across a mudflat. Journal of the Marine Biological Association of the United Kingdom, 61, 107–116.CrossRefGoogle Scholar
Dekker, R., 1989. The macrozoobenthos of the subtidal western Dutch Wadden Sea. 1. Biomass and species richness. Netherlands Journal of Sea Research, 23, 57–68.CrossRefGoogle Scholar
Dries, M., & Adelung, D., 1982. Die Schlei, ein Modell für die Verbreitung der Strandkrabbe Carcinus maenas. Helgoländer Meeresuntersuchungen, 35, 65–77.CrossRefGoogle Scholar
D'udekem-D'acoz, C., 1993. Activitiés reproductrices saisonnières des différentes classes de tailles d'une population de crabes verts Carcinus maenas (Linnaeus, 1758) dans le sud de la mer du Nord. Cahiers de Biologie Marine, 35, 1–13.Google Scholar
Elliott, M., & Kingston, P.F., 1987. The sublittoral fauna of the estuary and Firth of Forth, Scotland. Proceedings of the Royal Society of Edinburgh B, 93, 449–465.Google Scholar
Elliott, M., O'reilly, M.G. & Taylor, C.J.L., 1990. The Forth estuary: a nursery and overwintering area for North Sea fishes. Hydrobiologia, 195, 89–103.CrossRefGoogle Scholar
Fernández, L., González-Gurriaran, E. & Freire, J., 1991. Population biology of Liocarcinus depurator (Brachyura: Portunidae) in mussel raft culture areas in the Ría de Arousa (Galicia, NW Spain). journal of the Marine Biological Association of the United Kingdom, 71, 375–390.CrossRefGoogle Scholar
Hostens, K. & Hamerlynck, O., 1994. The mobile epifauna of the soft bottoms in the subtidal Oosterschelde estuary: structure, function and impact of the storm-surge barrier. Hydrobiologia, 282–283, 479–496.CrossRefGoogle Scholar
Hunter, E. & Naylor, E. 1993. Intertidal migration by the shore crab Carcinus maenas. Marine Ecology Progress Series, 101, 131–138.CrossRefGoogle Scholar
Ingle, R.W., 1980. British crabs. London: British Museum (Natural History).Google Scholar
Jayamanne, S.C., 1995. Population dynamics, biology and ecology of the caridean shrimps; Crangon crangon Linnaeus, Crangon allmanni Kinahan and Pandalus montagui Leach in the estuary and Firth of Forth, Scotland. PhD thesis, University of Stirling, Scotland.Google Scholar
Jensen, K.T. & Jensen, J.N., 1985. The importance of some epibenthic predators on the density of juvenile benthic macrofauna in the Danish Wadden Sea. Journal of Experimental Marine Biology and Ecology, 89, 157–174.CrossRefGoogle Scholar
Klein, Breteler W.C.M., 1976. Settlement, growth and production of the shore crab, Carcinus maenas on tidal flats in the Dutch Wadden Sea. Netherlands Journal of Sea Research, 10, 354–376.CrossRefGoogle Scholar
McGaw, I.J. & Naylor, E., 1992. Distribution and rhythmic locomotor patterns of estuarine and open-shore populations of Carcinus maenas. journal of the Marine Biological Association of the United Kingdom, 72, 599–609.CrossRefGoogle Scholar
McLusky, D.S., 1987. Intertidal habitats and benthic macrofauna of the Forth estuary, Scotland. Proceedings of the Royal Society of Edinburgh B, 93, 389–399.Google Scholar
Meeren, G.I. Van Der, 1992. Location of spawning shore crabs, Carcinus maenas (L., 1758) (Decapoda, Brachuyra). Crustaceana, 63, 92–94.CrossRefGoogle Scholar
Munch-Petersen, S., Sparre, P. & Hoffman, E., 1982. Abundance of the shore crab, Carcinus maenas (L.) estimated from mark-recapture experiments. Dana, 2, 97–121.Google Scholar
Muus, B.J., 1967. The fauna of Danish estuaries and lagoons. Distribution and ecology of dominating species in the shallow reaches of Mesohaline zone. Meddelelser fra Danmarks Fiskeri-og Havundersøgelser, 5, 1–316.Google Scholar
Naylor, E., 1962. Seasonal changes in a population of Carcinus maenas (L.) in the littoral zone. Journal of Animal Ecology, 31, 601–609.CrossRefGoogle Scholar
Perkins, E.J., 1974. The biology of estuaries and coastal waters. London: Academic Press.Google Scholar
Poulsen, E.M., 1949. On the distribution of the Brachyura (Crustacea, Decapoda) in Danish waters. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kjøbenhavn, 111, 111–130.Google Scholar
Roddie, B.D., 1988. Factors affecting the abundance and distribution of estuarine zooplankton, with special reference to the copepod Eurytemora affinis (Poppe). PhD thesis, University of Stirling, Scotland.Google Scholar
Venema, S.C., & Creutzberg, F., 1973. Seasonal migration of the swimming crab Macropipus holsatus in an estuarine area controlled by tidal streams. Netherlands Journal of Sea Research, 7, 94–102.CrossRefGoogle Scholar
Warman, C.G., Ried, D.G. & Naylor, E., 1993. Variation in the tidal migratory behaviour and rhythmic light-responsiveness in the shore crab, Carcinus maenas. Journal of the Marine Biological Association of the United Kingdom, 73, 355–364.CrossRefGoogle Scholar
Wolff, W.J. & Sandee, A.J.J., 1971. Distribution and ecology of the Decapoda Reptantia of the estuarine area of the rivers Rhine, Meuse, and Scheldt. Netherlands Journal of Sea Research, 5, 197–226.CrossRefGoogle Scholar