tailieunhanh - OCEANOGRAPHY and MARINE BIOLOGY: AN ANNUAL REVIEW (Volume 46) - Chapter 3

Rà soát này nhằm mục đích cập nhật và mở rộng tóm tắt Tiews (1970) cho sinh học và thủy sản của Crangon crangon (L.). Rộng phạm vi phân phối dọc theo bờ biển châu Âu từ Biển Trắng đến Ma-rốc trong Đại Tây Dương và khắp vùng biển Địa Trung Hải và đen phản ánh khả năng của C. crangon để đối phó với một loạt các điều kiện nhiệt độ và độ mặn và giải thích thêm bởi khả năng di cư của mình | AUTECOLOGY OF CRANGON CRANGON L. WITH AN EMPHASIS ON LATITUDINAL TRENDS JOANA CAMPOS1 2 HENK W. VAN DER VEER2 1Centro Interdisciplinar de Investigaẹão Marinha e Ambiental Rua dos Bragas 289 4050-123 Porto Portugal E-mail jcampos@ 2Royal Netherlands Institute for Sea Research PO Box 59 1790 AB Den Burg Texel The Netherlands E-mail veer@ Abstract This review aims to update and extend the synopsis by Tiews 1970 on the biology and fisheries of Crangon crangon L. . Its wide distributional range along the European coast from the White Sea to Morocco within the Atlantic and throughout the Mediterranean and Black Seas reflects the capability of C. crangon to cope with a wide range of temperature and salinity conditions and is further explained by its migratory capacity. Present knowledge suggests that the limiting factor at the northern cold water edge of its distribution is formed by egg and larval development and at the southern warm water edge by maintenance costs. No information is available about the genetic population structure but patterns in isoenzymes and in morphometric characters indicate the existence of various subpopulations. Over its distributional range especially along the north Atlantic coast clear trends in life-history parameters are observed most likely reflecting temperature conditions. Due to its generally high abundance the common shrimp forms a key component in the functioning of coastal shallow ecosystems however it is unclear whether the population dynamics of the species is subject to top-down or bottom-up control. On the one hand C. crangon is an opportunistic feeder with a wide prey spectrum though it remains to be solved whether growth conditions are optimal and only determined by prevailing water temperatures or whether food limitation is a regulating mechanism. On the other hand top-down control by predation cannot be excluded since C. crangon is also an important food item for a variety of predators especially fish species.