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首页> 外文期刊>Ocean & coastal management >Decline of a Callista chione (Bivalvia: Veneridae) bed in the Maresme coast (northwestern Mediterranean Sea)
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Decline of a Callista chione (Bivalvia: Veneridae) bed in the Maresme coast (northwestern Mediterranean Sea)

机译：Maresme海岸（西北地中海）的Callista chione（Bivalvia：Veneridae）床的下降

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摘要

Bivalves are considered key species in many marine communities and the decline of their populations usually causes changes in the structure of the ecosystems. The aim of the present study was to investigate changes in the spatial distribution and population structure of an exploited shellfish bed of Callista chione at a location of the northwestern Mediterranean Sea and analyse its potential causes. To this end field surveys for the years 2004 and 2010 covering the whole distribution area of the species were performed and all historical data on commercial landings, clam biomass and density, and locations and volume of dredged sand for beach nourishment were compiled. Results showed that the distribution had been hugely reduced, showing a sharp decline in density and biomass and a decrease in the mean population size in 2010. Our results confirm that the species is a slow-growing bivalve that is highly vulnerable to disturbances prolonged in time. Persistent sand dredging operations since 1987 have gradually reduced the distribution area of the smooth clam to the northeastern part of the clam bed. Consequently, fishing activity has concentrated on a smaller area, thus increasing the fishing effort in the northern part. Therefore, the results clearly suggest that the decline of C. chione bed was mainly caused by the interaction of two coastal uses: sand dredging and clam fisheries. Based on this study, some management guidelines are proposed.
机译：双壳类被认为是许多海洋社区的关键物种，其种群数量的减少通常会导致生态系统结构的变化。本研究的目的是调查西北地中海沿岸Callista chione的贝类被开发贝类床的空间分布和种群结构的变化，并分析其潜在原因。为此，进行了2004年和2010年的实地调查，涵盖了该物种的整个分布区域，并收集了有关商业着陆，蛤类生物量和密度以及用于海滩养护的疏sand沙的位置和体积的所有历史数据。结果表明，该分布已大大减少，2010年密度和生物量急剧下降，平均种群数量减少。我们的结果证实该物种是一种缓慢生长的双壳类动物，极易受到时间延长的干扰的影响。 。自1987年以来，持续的挖沙作业逐渐减少了顺滑蛤lam到蛤bed东北部的分布面积。因此，捕鱼活动集中在较小的区域，从而增加了北部的捕鱼工作量。因此，结果清楚地表明，C。chione床的减少主要是由两个沿海用途：挖沙和蛤类渔业的相互作用引起的。基于这项研究，提出了一些管理指南。

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  • 来源
    《Ocean & coastal management》 |2014年第6期|15-25|共11页
  • 作者

    Marc Baeta; Montserrat Ramon; Eve Galimany;

  • 作者单位

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain,Instituto Espanol de Oceanografia, Centre Oceanografic de les Balears, Moll de Ponent s, 07015 Palma de Mallorca, Spain;

    Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain,Instituto Espanol de Oceanografia, Centre Oceanografic de les Balears, Moll de Ponent s, 07015 Palma de Mallorca, Spain;

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