Changes in the structure of a shallow sandy-beach community in Peru during an El Nino event
Changes in the structure of a shallow sandy-beach community in Peru during an El Nino event
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厄尔尼诺事件期间秘鲁浅滩群落结构的变化
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
A. Robles
中科院分区：
文献类型：
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作者：
W. Arntz;T. Brey;J. Tarazona;A. Robles
秘鲁上升流系统的浅沃茨中的许多动物区系砂底群落居住着大量的共存种群的冲浪蛤Mesodesma donacium和Donax peruvianus，以及由anomuran鼹鼠蟹Emerita analoga。在正常条件下，平衡状态是可能的，其中任何一个物种占主导地位。对秘鲁利马以南的一个中带群落进行了为期2.5年的调查，涵盖了1982-83年厄尔尼诺（EN）之前、期间和之后的时期。后来又被重新讨论了几次。生长，招聘和死亡率，因此，生产中连草和Donax在一定程度上改变EN之前。然而，在这一事件中，中带草在当地灭绝，到1986年7月，也就是恢复正常气温三年后，该地区还没有被同化。在EN之后立即接管的Donax，从未达到以前占主导地位的Mesodesma的密度。Emerita仍然是一个罕见的物种，而spionid polychaerodynamics的重要性增加。医疗…
Many infaunal sandy-bottom communities in shallow waters of the Peruvian upwelling system are inhabited by large coexisting populations of the surf clams Mesodesma donacium and Donax peruvianus as well as by the anomuran mole crab Emerita analoga. Under normal conditions, equilibrium states are possible with any one of these species dominating. A Mesodesma community south of Lima in Peru was investigated over 2,5 years, covering periods prior to, during and after the El Nino (EN) of 1982–83. It was revisited several times later. Growth, recruitment and mortality and, therefore, production of Mesodesma and Donax varied to some extent before EN. However, during the event Mesodesma became locally extinct and had not recolonized the area by July 1986, three years after the return of normal temperatures. Donax, which took over immediately after EN, never reached the densities of the former dominant Mesodesma. Emerita remained a rare species as well, whereas spionid polychaetes increased in importance. The medi...