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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Variability in swimming behavior among broods of blue crab (Callinectes sapidus) zoeae
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Variability in swimming behavior among broods of blue crab (Callinectes sapidus) zoeae

机译：蓝蟹（Callinectes sapidus）zoeae亲鱼游泳行为的变异性

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Blue crabs (Callinectes sapidus) support economically important fisheries across the eastern United States, which have exhibited historical variability in recruitment. Blue crab zoeae develop in surface waters over the continental shelf, where they need to constantly swim upward in order to stay within surface currents to successfully disperse. Morphology influences the drag zoeae experience and their ability to produce thrust, and morphological traits can vary across the population, especially between larval broods. The objectives of this study were to characterize the swimming behavior of first stage C. sapidus zoeae, determine whether there were inter-brood differences in swimming behavior, and identify morphological traits that are correlated with swimming behavior. The swimming behavior of zoeae from nine blue crab broods were observed within 24 h of hatching using video recordings, and metrics relating to velocity, orientation, and path straightness were calculated. Individual zoeae exhibited substantial variability in behavior, and broods significantly differed for all behavioral metrics measured. A mixture model analysis identified two modes of behavior each for velocity, orientation, and path straightness. These behavioral modes exist within individual broods, but the proportions exhibiting each behavior varied. Some morphometrics were significantly correlated with behavior, though some hypotheses based on the theoretical mechanics of zoeal swimming were not confirmed. Zoeal swimming ability, in terms of velocity and path straightness, varies among individuals within broods, yet across broods patterns of behavior were somewhat similar. The behavioral groups observed may result in inequality in the energetic costs of swimming for zoeae within a given brood, as well as varying optimization of vertical swimming. These results highlight the importance of individual and brood variation in swimming behavior and demonstrate the relationship of morphology in determining swimming behavior. Future work investigating zoeal swimming mechanics and behavior should incorporate this population-level variation.
机译：蓝蟹（Callinectes sapidus）为美国东部具有重要经济意义的渔业提供支持，这些国家在招募方面表现出历史性的可变性。蓝蟹生活在大陆架上的地表水域中，它们需要不断向上游动，以便停留在地表水流中才能成功地扩散。形态学影响了阻力动物园的经验及其产生推力的能力，并且形态特征在种群中可能会有所不同，尤其是在幼虫群之间。这项研究的目的是表征第一阶段隐孢子虫的游泳行为，确定游泳行为是否存在种间差异，并鉴定与游泳行为相关的形态特征。使用视频记录在孵化的24小时内观察到来自九个蓝蟹亲鱼的斑zo的游泳行为，并计算了与速度，方向和路径平直度有关的度量。个别的动物区系表现出明显的行为变异，并且对于所有测得的行为指标，雏形明显不同。混合模型分析确定了两种行为模式，分别针对速度，方向和路径平直度。这些行为模式存在于各个个体中，但是展现每种行为的比例却有所不同。一些形态计量学与行为显着相关，尽管尚未证实一些基于动物游泳理论力学的假设。在速度和路径平直度方面，Zoeal游泳能力在育雏个体之间有所不同，但是在整个育雏群体中，行为方式有些相似。观察到的行为群体可能会导致在给定的群体内游走于动物园的精力成本不均，以及垂直游泳的不同优化。这些结果突出了游泳行为中个体和亲体变化的重要性，并证明了形态学在确定游泳行为中的关系。未来的调查动物园游泳机制和行为的工作应纳入这种人口水平的变化。

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