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首页> 外文期刊>Ecosphere >Risk taking not foraging behavior predicts dispersal of recently emerged stream brook charr (Salvelinus fontinalis)
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Risk taking not foraging behavior predicts dispersal of recently emerged stream brook charr (Salvelinus fontinalis)

机译：冒险冒险不觅食行为预示着最近出现的溪流Charr（ Salvelinus fontinalis ）的扩散

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摘要

Several hypotheses predict that individual differences in migration and dispersal are related to individual differences in routine behavior associated with foraging and risk taking. We tested whether short‐term dispersal of recently emerged brook charr Salvelinus fontinalis was correlated with differences in activity during prey search in the field (a measure of foraging tactic) or in the time taken to exit a dark tube into an unfamiliar field environment (a measure of risk taking). For one sample of fish, we tested whether an individual's propensity to disperse in a standardized dispersal test in the lab was correlated with its activity during prey search and its exit times in the field. For another sample of marked, released and recaptured fish, we tested whether an individual's minimum displacement distance over 6 days in the field (a measure of dispersal in the field) was related to its propensity to disperse in the lab. For the first sample, an individual's propensity to disperse in the lab was correlated with risk taking only, but, contrary to expectation, individuals with long exit times (risk‐avoiders) dispersed farther than those with short exit times (risk‐takers). For the second sample, dispersal in the field was also correlated with propensity to disperse in the lab, but, contrary to expectation, individuals with greater displacements in the field displayed lower propensities to disperse in the lab. Our findings demonstrate that individual differences in juvenile dispersal are related to differences in risk taking behavior, but not in foraging tactic, and that the nature of this relationship can depend on environmental context. These findings are consistent with the hypothesis that individuals differing in risk taking behavior can contribute disproportionately to ecological processes involving long‐distance movement.
机译：一些假设预测迁移和分散的个体差异与觅食和冒险行为相关的常规行为的个体差异有关。我们测试了最近出现的布鲁克·查尔·Salvelinus fontinalis的短期散布是否与野外猎物搜索（一种觅食战术）期间的活动差异或离开暗管进入陌生领域所需的时间相关环境（冒险措施）。对于一个鱼样本，我们测试了实验室中标准分散测试中某人的分散倾向是否与其在猎物搜索过程中的活动及其在田间的离开时间相关。对于另一个带标记，已释放和重新捕获的鱼的样本，我们测试了一个人在野外6天的最小位移距离（野外扩散的度量）是否与其在实验室中扩散的倾向有关。对于第一个样本，一个人在实验室中分散的倾向仅与冒险相关，但与预期相反，退出时间长（规避风险）的人比退出时间短（规避风险者）的人分散得更远。对于第二个样本，在现场的散布也与实验室中的散布倾向相关，但与预期相反，在现场中位移较大的个体在实验室中散布的散布倾向较低。我们的研究结果表明，青少年分散的个体差异与冒险行为的差异有关，但与觅食策略无关，并且这种关系的性质可能取决于环境。这些发现与以下假设是一致的：冒险行为不同的个体可以对涉及长距离运动的生态过程做出不成比例的贡献。

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