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The effects of dredging on shell formation in the razor clam Ensis siliqua from Barrinha, southern Portugal

Published online by Cambridge University Press:  09 October 2019

M.B. Gaspar ,
C.A. Richardson  and
C.C. Monteiro
M.B. Gaspar
Affiliation:
Instituto Português de Investigaçào Maritima (Centro de Investigaçào Maritima do Sul), Avenida 5 de Outubro, 8700 Olhao, Portugal '
C.A. Richardson
Affiliation:
School of Ocean Sciences, University of Wales, Menai Bridge, Anglesey, LL59 5EY
C.C. Monteiro
Affiliation:
Instituto Português de Investigaçào Maritima (Centro de Investigaçào Maritima do Sul), Avenida 5 de Outubro, 8700 Olhao, Portugal '
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Abstract

Shell growth of the razor clam Ensis siliqua (Mollusca: Bivalvia) from southern Portugal has been analysed using both surface growth rings and internal shell microgrowth patterns. The growth rate estimated from an analysis of the growth rings is slower (von Bertalanffy growth, constant K=0·27) than that determined from the annual narrowing of the internal microgrowth patterns present in shell sections (K=0·65), although both methods predict a similar asymptotic length, L∞, of 144·8 and 139·6 mm, respectively.

The Barrinha razor clam population occurs in a heavily dredged area and an analysis of shell sections reveals the presence of a series of shell margin breaks consisting of deep clefts in the outer shell layer in which sand grains are embedded. It is suggested that these disturbances to shell growth are the result of repeated dredge damage. The frequency of the clefts increases with the size and age of the razor clams, and thus the shells provide a record of the intensity and frequency of unsuccessful capture or retrieval attempts. Cleft formation also occurred seasonally with the deposition of a small cleft during June, but these annual clefts were much less pronounced than those caused by dredge damage.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 74 , Issue 4 , November 1994 , pp. 927 - 938
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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References

Anwar, N.A., Richardson, C.A. & Seed, R., 1990. Age determination, growth rate and population structure of the horse mussel Modiolus modiolus . Journal of the Marine Biological Association of the United Kingdom, 70, 441–457.Google Scholar
Barker, R.M., 1964. Microtextural variation in Pelecypod shells. Malacologia, 2, 69–86.Google Scholar
Bhattacharya, C.G., 1967. A simple method of resolution of a distribution into Gaussian components. Biometrics, 23, 115–135.Google Scholar
Caddy, J.F., 1968. Underwater observations on scallop(Placopecten magellanicus) behaviour and drag efficiency. Journal of the Fisheries Research Board of Canada, 25, 2123–2141.Google Scholar
Caddy, J.F., 1973. Underwater observations on tracks of dredges and trawls and some effects of dredging on a scallop ground. Journal of the Fisheries Research Board of Canada, 30, 173–180.Google Scholar
Cassie, R.M., 1954. Some uses of probability paper in the analysis of size frequency distributions. Australian Journal of Marine and Freshwater Research, 5, 513–522.Google Scholar
Gaspar, M.B., Castro, M. & Monteiro, C.C., 1994. Estudo do crescimento da ameijoa branca (Spisula solida L.) da Costa sul Algarvia.Proceedings of the VIII Simposio Iberico de Estudios del Bentos Marino, Blanes (Girona), pp. 78–79.Google Scholar
Gruffydd, Ll.D., 1972. Mortality of scallops on a Manx scallop bed due to fishing. Journal of the Marine Biological Association of the United Kingdom, 52, 449–455.Google Scholar
Harding, J.P., 1949. The use of probability paper for the graphical analysis of polymodal frequency distributions. Journal of the Marine Biological Association of the United Kingdom, 28, 141–153.Google Scholar
Henderson, S.M. & Richardson, C.A., 1994. A comparison of the age, growth rate and burrowing behaviour of the razor clams Ensis siliqua and E. ensis . Journal of the Marine Biological Association of the United Kingdom, 74, 939–954.Google Scholar
Jones, D.S., 1980. Annual cycle of reproduction and shell growth in the bivalves Spisula solidissima and Arctica islandica. PhD thesis, Department of Geological and Geophysical Sciences, Princeton University.Google Scholar
Jones, D.S., Thompson, I. & Ambrose, W., 1978. Age and growth rate determinations for the Atlantic surf clam Spisula solidissima (Bivalvia: Mactracea), based on internal growth lines in shell cross-sections. Marine Biology 47, 63–70.Google Scholar
Kato, Y. & Hamai, I. 1975. Growth and shell formation of the surf clam, Spisula sachalinensis (Schrenck). Bulletin of the Faculty of Fisheries, Hokkaido University, 25, 291–303.Google Scholar
Kennish, M.J. 1980. Shell microgrowth analysis:Mercenaria mercenaria as a type example for research in populations dynamics. In Skeletal growth of aquatic organisms: biological records of environmental change (ed. Rhoads, D.C. and Lutz, R.A.), pp. 255–294. New York: Plenum Press.Google Scholar
Kennish, M.J. & Olsson, R.K., 1975. Effects of thermal discharges on the microstructural growth of Mercenaria mercenaria . Environmental Geology, 1, 41–64.Google Scholar
Kerswill, C.J., 1944. The growth rate of bar clams. Progress Report of the Atlantic Coast Stations of the Fisheries Research Board of Canada, 35, 18–20.Google Scholar
Lutz, R.A., 1976. Annual growth patterns in the inner shell layer of Mytilus edulis L. Journal of the Marine Biological Association of the United Kingdom, 56, 723–731.Google Scholar
McLoughlin, R.J., Young, P.C., Martin, R.B. & Parslow, J., 1991. The Australian scallop dredge: estimates of catching efficiency and associated indirect fishing mortality. Fisheries Research, 11, 1–24.Google Scholar
Monteiro, C. & Gaspar, M., 1993. Bivalves do litoral oceânico algarvio: breve noticia sobre a situacao actual dos Principais bancos (Julho 1993). Relatdrio Tecnico Cientifico INIP, Lisboa, 65, 19.Google Scholar
Pannella, G. & MacClintock, C., 1968. Biological and environmental rhythms reflected in molluscan shell growth. Journal of Paleontology, 42, supplement no. 5, 64–79.Google Scholar
Ramón, M., Abello, P. & Richardson, C.A. 1994. Growth of Donax trunculus (Bivalvia: Donacidae) in the western Mediterranean. Marine Biology, in press.Google Scholar
Ramón, M. & Richardson, C.A., 1992. Age determination and shell growth of Chamelea gallina (Bivalvia: Veneridae) in the western Mediterranean. Marine Ecology Progress Series, 89, 15–23.Google Scholar
Rhoads, D.C. & Lutz, R.A., 1980. Skeletal growth of aquatic organisms: biological records of environmental change. New York, Plenum press.Google Scholar
Rhoads, D.C. & Pannella, G., 1970. The use of molluscan growth patterns in ecology and paleoecology. Lethaia, 3, 143–161.Google Scholar
Richardson, C.A., 1987. Microgrowth patterns in the shell of the Malaysian cockle Anadara granosa (L.) and their use in age determination. Journal of Experimental Marine Biology and Ecology, 111, 77–98.Google Scholar
Richardson, C.A., Collis, S.A., Ekaratne, K., Dare, P. & Key, D., 1993. The age determination and growth rate of the European flat oyster, Ostrea edulis, in British waters determined from acetate peels of umbo growth lines. ICES Journal of Marine Science, 50, 493–500.Google Scholar
Richardson, C.A., Crisp, D.J. & Runham, N.W., 1979. Tidally deposited growth bands in the shell of the common cockle Cerastoderma edule (L.). Malacologia, 18, 277–290.Google Scholar
Richardson, C.A., Crisp, D.J. & Runham, N.W., 1980. Factors influencing shell growth in Cerastoderma edule . Proceedings of the Royal Society of London (B), 210, 513–531.Google Scholar
Richardson, C.A., Seed, R. & Naylor, E., 1990. Use of internal growth bands for measuring individual and population growth rates in Mytilus edulis from offshore platforms. Marine Ecology Progress Series, 66, 259–265.Google Scholar
Richardson, C.A. & Walker, P., 1991. The age structure of a population of the hard-shell clam, Mercenaria mercenaria from Southampton Water, England, derived from acetate peel replicas of shell sections. ICES Journal of Marine Science, 48, 229–236.Google Scholar
Ropes, J.W., Jones, D.S., Murawski, S.A., Serchuk, F.M. & Jearld, A.Jr, 1984. Documentation of annual growth lines in ocean quahogs, Arctica islandica Linné. Fisheries Bulletin 82, 1–19.Google Scholar
Ropes, J.W. & Murawski, S.A., 1983. Maximum shell length and longevity in ocean quahogs, Arctica islandica Linné. International Council for the Exploration of the Sea (CM Papers and Reports), CM 1983/K: 32, 8 pp.Google Scholar
SAS Institute Inc., 1985. SAS user's guide: statistics, 5th ed. Cary, North Carolina: SAS Institute Inc.Google Scholar
Seed, R. & Richardson, C.A., 1990. Mytilus growth and its environmental responsiveness. In Neurobiology of Mytilus edulis (ed. Stefano, G.B.), pp. 1–37. Manchester University Press.Google Scholar
Swennen, C., Leopold, M.F. & Stock, M., 1985. Notes on growth and behaviour of the American razor clam Ensis directus in the Wadden Sea and the predation on it by birds. Helgoländer Meeresuntersuchungen, 39, 255–261.Google Scholar
Tebble, N., 1966. British bivalve seashells: a handbook for identification, 2nd ed. Edinburgh HMSO: British Museum (Natural History).Google Scholar
Thompson, I., Jones, D.S. & Dreibelbis, D., 1980. Annual internal growth banding and life history of the ocean quahog Arctica islandica (Mollusca: Bivalvia). Marine Biology, 57, 25–34.Google Scholar