INFLUENCES OF PREDATORY POLYCHAETES AND EPIBENTHIC PREDATORS ON THE STRUCTURE OF A SOFT-BOTTOM COMMUNITY IN A MAINE ESTUARY
INFLUENCES OF PREDATORY POLYCHAETES AND EPIBENTHIC PREDATORS ON THE STRUCTURE OF A SOFT-BOTTOM COMMUNITY IN A MAINE ESTUARY
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DOI：
10.1016/0022-0981(84)90002-9
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发表时间：
1984-01-01
影响因子：
2
通讯作者：
AMBROSE, WG
中科院分区：
文献类型：
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作者：
AMBROSE, WG
现场操作被用来确定的重要性，2捕食性多毛类，沙蚕virens Sars和Glycera dibranchiata Ehlers，和底栖捕食者在构建一个潮间带软底群落在缅因州。表层底栖食肉动物被排除在外的软底部分使用笼子，其中还包括高密度的捕食性多毛类。实验从1979年6月开始进行，为期10周和20周。排除底栖捕食者没有影响，10周后的动物密度，但产生。apprxeq。1.5-20周后总密度增加一倍。由于海鸥（Larus spp.）避免了所有的笼子，包括那些没有设计排除底栖食肉动物，海鸥捕食的影响，底栖动物丰度没有测试使用排除笼。螃蟹，Carcinus maenas（Linnaeus）和巨蟹座的人说，在笼子里没有设计排除捕食者。在含有高浓度G. dibranchiata密度和最低的笼含有沙蚕密度升高。沙蚕（Nereis virens）是唯一一个在G. dibranchiata，这可能解释了G. dibranchiata处理。实验室实验表明，G.双鳃沙蚕能够捕食绿沙蚕额外的实地实验表明，存在的沙蚕virens减少了丰富的一些类群内的第一个10天的殖民化。沙蚕的底栖动物的密度可能会减少捕食和/或干扰沉积物表面。这些结果表明，复杂的相互作用内的底栖动物是重要的结构海洋软底群落。
Field manipulations were used to determine the importance of 2 predatory polychaetes, Nereis virens Sars and Glycera dibranchiata Ehlers, and epibenthic predators in structuring an intertidal soft-bottom community in Maine. Epibenthic predators were excluded from portions of the soft bottom using cages which also enclosed elevated densities of the predatory polychaetes. The experiments ran 10 wk and 20 wk beginning in June 1979. Exclusion of epibenthic predators had no effect on infaunal densities after 10 wk but produced .apprxeq. 1.5-fold increase in total density after 20 wk. Since gulls (Larus spp.) avoided all cages, including those not designed to exclude epibenthic predators, the effect of gull predation on infaunal abundances was not tested using exclusion cages. Crabs, Carcinus maenas (Linnaeus) and Cancer irroratus Say were observed in cages not designed to exclude predators. Densities of Nephthys incisa Malmgren, Polydora ligni Webster, Streblospio benedicti Webster, Scoloplos robustus Verrill, phyllodocids, and bivalves were highest in cages containing elevated G. dibranchiata density and lowest in cages containing elevated Nereis virens density. Nereis virens was the only taxon whose abundance was reduced in the presence of G. dibranchiata which may account for high infaunal densities in the G. dibranchiata treatment. Laboratory experiments demonstrated that G. dibranchiata are capable of preying on Nereis virens. Additional field experiments revealed that the presence of Nereis virens reduced the abundance of some taxa within the first 10 days of colonization. Nereis virens may have reduced infaunal densities by predation and/or disturbance at the sediment surface. These results suggest that complex interactions within the infauna are important in structuring marine soft-bottom communities.