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Rain-driven changes in fish dynamics: a switch from spatial to temporal segregation

机译:雨水驱动的鱼类动态变化:从空间隔离到时间隔离

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Niche segregation models underpin our understanding of speciation, population dynamics, and the evolution of foraging strategies. Many studies have evaluated changes in niche segregation dynamics over seasonal and decadal scales, but the influence of short-term stochastic processes like weather are poorly understood. This represents a problem for predicting ecosystem-level responses to the changes in weather patterns that are anticipated to occur over the coming decades. By simultaneously monitoring spatial and temporal segregation in a large estuarine piscivore and smaller benthic carnivore (mulloway Argyrosomus japonicus and sand whiting Sillago ciliata, respectively) before and after rainfall, we tested for disturbance-driven changes in species segregation. During non-rain conditions, both species were diurnally active but spatially segregated in the vertical plane (i.e. water depth). After rainfall, mulloway encroached on the whiting's vertical habitat and reversed their activity rhythm, while whiting did the opposite, strengthening their diel activity rhythm. Long-term fishery catch data were broadly consistent with this pattern, with rain-associated increases in mulloway catchability contrasting a decrease in catchability of whiting. Our example suggests short-term stochastic disturbances can drive drastic changes in fish dynamics, and highlights the significance of future changes to rainfall regimes in structuring ecosystem processes.
机译:生态位隔离模型巩固了我们对物种,种群动态以及觅食策略演变的理解。许多研究已经评估了生态位隔离动态随季节和十年尺度的变化,但人们对诸如天气等短期随机过程的影响知之甚少。这代表了一个问题,无法预测生态系统级别对预计未来几十年内将发生的天气变化的响应。通过同时监测大型河口食肉动物和较小底栖食肉动物(分别是mul螺和白垩纪的纤毛虫)的时空隔离,我们测试了扰动驱动的物种隔离变化。在非雨天条件下,这两种物种都具有昼夜活跃性,但在垂直平面上(即水深)在空间上隔离。降雨后,mul沟侵入白垩母的垂直栖息地并颠倒了它们的活动节奏,而白垩母则相反,从而增强了白el的活动节奏。长期渔业捕捞数据与这种模式基本一致,与雨水相关的沟捕捞能力增加,而白的捕捞能力下降。我们的示例表明,短期随机扰动可能会导致鱼类动态的急剧变化,并强调了未来降雨对降雨体制的变化在构建生态系统过程中的重要性。

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