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首页> 外文期刊>Ecological Applications >Gizzard shad put a freeze on winter mortality of age-0 yellow perch but not white perch
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Gizzard shad put a freeze on winter mortality of age-0 yellow perch but not white perch

机译：izz鱼冻结了0岁黄色鲈鱼而不是白色鲈鱼的冬季死亡率

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Four decades of observations on the limnology and fishes of Oneida Lake, New York, USA, provided an opportunity to investigate causes of mortality during winter, a period of resource scarcity for most juvenile fishes, in age-0 yellow perch (Perca flavescens) and age-0 white perch (Morone americana). This time series contains several environmental (e.g., winter severity) and biological (e.g., predator abundance) signals that can be used to disentangle multiple effects on overwinter mortality of these fishes. A multiple regression analysis indicated that age-0 yellow perch winter mortality was inversely related to fish length in autumn and to the abundance of alternative prey (gizzard shad [Dorosoma cepedianum] and white perch). However, no length-selective predation of yellow perch by one of the main predators, adult walleye (Sander vitreus), was detected. In contrast, white perch mortality was directly associated with total predator biomass and abundance of white perch in autumn,. and inversely related to yellow perch abundance as a potential buffer species, but not to the abundance of gizzard shad. Winter severity was not a significant predictor of mortality for either perch species. Predicted winter starvation mortality, from a model described in the literature, was much lower than observed mortality for yellow perch. Similar models for white perch were correlated with observed mortality. These results collectively suggest that predation is the main mechanism shaping winter mortality of yellow perch, while both predation and starvation may be important for white perch. This analysis also revealed that gizzard shad buffer winter mortality of yellow perch. Although winter duration determines the northern limit of fish distributions, in mid-latitude Oneida Lake and for these species, predator-prey interactions seem to exert a greater influence on winter mortality than starvation.
机译：对美国纽约奥尼达湖的湖泊学和鱼类的四十年观察提供了一个机会，以调查冬季致死的原因，这是大多数幼鱼在资源匮乏时期，0岁黄鲈（Perca flavescens）和年龄0的白色鲈鱼（美洲莫洛）。该时间序列包含几个环境信号（例如，冬季严峻程度）和生物学信号（例如，捕食者的丰度），可用于区分这些鱼类越冬死亡率的多种影响。多元回归分析表明，0岁黄色鲈鱼的冬季死亡率与秋季的鱼类长度以及其他猎物（（鱼[Dorosoma cepedianum]和白色鲈鱼）的数量成反比。但是，没有检测到主要食肉动物之一成年角膜白斑（Sander vitreus）对黄鲈的长度选择性捕食。相反，秋天白鲈的死亡率与捕食者的总生物量和白鲈的丰富度直接相关。与黄色鲈鱼丰富作为潜在的缓冲物种成反比，但与izz的丰富无关。冬季严酷程度并不是两种鲈鱼死亡率的重要预测指标。根据文献中描述的模型，预测的冬季饥饿死亡率远低于黄鲈的观测死亡率。类似的白鲈鱼模型与观察到的死亡率相关。这些结果共同表明，捕食是影响黄鲈冬季死亡率的主要机制，而捕食和饥饿对于白鲈可能很重要。这项分析还显示，izz可以缓冲黄色鲈鱼的冬季死亡率。尽管冬季持续时间决定了鱼类分布的北部界限，但在中纬度的奥尼达湖和这些物种中，捕食者与猎物的相互作用似乎对饥饿的影响大于饥饿。

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