Tropical insular fish assemblages are resilient to flood disturbance
Tropical insular fish assemblages are resilient to flood disturbance
复制标题
热带岛屿鱼类群落能够抵御洪水干扰
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Kwak
中科院分区：
文献类型：
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作者：
W. E. Smith;T. Kwak
稳定的环境条件，有利于密度依赖过程调节的生态群落的发展时期，被随机的干扰时期打断，可能会重组群落。干扰可能会影响人口通过栖息地的改变，死亡率，或流离失所。我们量化的鱼类栖息地条件，密度，和运动之前和之后的一个主要的洪水干扰在加勒比岛屿的热带河流栖息地调查，鱼类采样和人口估计，无线电遥测，被动监测PIT标签。本地流鱼类种群的急性死亡率和下游流离失所的幸存鱼类的证据。所有鱼类物种的数量减少，在大多数生命阶段的干扰后，但人口的招聘和迁移到腾出的上游栖息地。密度的变化是不均匀的大小类之间的大多数物种，表明改变大小结构。在人口一级的快速恢复过程似乎抑制在组合一级的影响，鱼类组合参数（物种丰富度和多样性）不变的洪水。本地鱼类组合出现弹性洪水干扰，迅速补偿死亡率和位移增加招聘和上游栖息地的adenonization。
Periods of stable environmental conditions, favoring development of ecological communities regulated by density-dependent processes, are interrupted by random periods of disturbance that may restructure communities. Disturbance may affect populations via habitat alteration, mortality, or displacement. We quantified fish habitat conditions, density, and movement before and after a major flood disturbance in a Caribbean island tropical river using habitat surveys, fish sampling and population estimates, radio telemetry, and passively monitored PIT tags. Native stream fish populations showed evidence of acute mortality and downstream displacement of surviving fish. All fish species were reduced in number at most life stages after the disturbance, but populations responded with recruitment and migration into vacated upstream habitats. Changes in density were uneven among size classes for most species, indicating altered size structures. Rapid recovery processes at the population level appeared to dampen effects at the assemblage level, as fish assemblage parameters (species richness and diversity) were unchanged by the flooding. The native fish assemblage appeared resilient to flood disturbance, rapidly compensating for mortality and displacement with increased recruitment and recolonization of upstream habitats.