NORTHERN QUAHOG (HARD CLAM) MERCENARIA MERCENARIA ABUNDANCE AND HABITAT USE IN CHESAPEAKE BAY
NORTHERN QUAHOG (HARD CLAM) MERCENARIA MERCENARIA ABUNDANCE AND HABITAT USE IN CHESAPEAKE BAY
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切萨皮克湾的北圆蛤（硬蛤） Mercenaria Mercenaria 丰度和栖息地利用
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Wesson
中科院分区：
文献类型：
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作者：
R. Mann;J. Harding;M. Southworth;J. Wesson
摘要/ Abstract摘要：2001-2002年，在切萨皮克湾（Chesapeake Bay）下游采用分层随机设计（n = 7358个站点）对硬蛤的密度和分布进行了调查，结果与历史上对蛤生境和密度的描述不一致。詹姆斯河下游的平均密度最高，达到3.1 m−2。在1970年代早期，在这些相同的生境中，观察到的最高平均密度是通常观察到的蛤蜊密度的一半。水流分布受水深和基材组成的影响显著。切萨皮克湾的硬蛤密度与沉积物粒度的增加呈正相关；在收集到的所有蛤中，有78%是在贝壳或沙滩栖息地发现的。然而，44%的沙质栖息地和54%的贝壳栖息地无人居住，这表明即使是通常支持较高蛤密度的栖息地类型，目前也可能未得到充分利用。
Abstract Recent (2001–2002) surveys of hard clam Mercenaria mercenaria density and distribution, using patent tongs in a stratified random design (n = 7,358 stations) in lower Chesapeake Bay are not consistent with historic descriptions of clam habitats and densities. The highest average densities observed, up to 3.1 clams m−2, were in the lower James River. The highest modern average density observed is half that of clam densities commonly observed in these same habitats during the early 1970s. Current distribution is significantly affected by water depth and substrate composition. Hard clam density in Chesapeake Bay is positively associated with increasing sediment grain size; 78% of all clams collected were found in shell or sand habitats. However, 44% of sand habitats and 54% of shell habitats were unoccupied suggesting that even habitat types that typically support higher clam densities may currently be underused.