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首页> 外文期刊>Oecologia >Individual variation in functional response parameters is explained by body size but not by behavioural types in a poeciliid fish
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Individual variation in functional response parameters is explained by body size but not by behavioural types in a poeciliid fish

机译：功能反应参数的个体差异是通过体型来解释的，而不是用网状鱼类的行为类型来解释的

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Functional responses are per-capita feeding rate models whose parameters often scale with individual body size but the parameters may also be further influenced by behavioural traits consistently differing among individuals, i.e. behavioural types or animal personalities. Behavioural types may intrinsically lead to lower feeding rates when consistently shy, inactive and easily stressed individuals cannot identify or respond to risk-free environments or need less food due to lower metabolic rates linked to behaviour. To test how much variation in functional response parameters is explained by body size and how much by behavioural types, we estimated attack rate and handling time individually for differently sized female least killifish (Heterandria formosa) and repeatedly measured behavioural traits for each individual. We found that individual fish varied substantially in their attack rate and in their handling time. Behavioural traits were stable over time and varied consistently among individuals along two distinct personality axes. The individual variation in functional responses was explained solely by body size, and contrary to our expectations, not additionally by the existing behavioural types in exploration activity and coping style. While behavioural trait-dependent functional responses may offer a route to the understanding of the food web level consequences of behavioural types, our study is so far only the second one on this topic. Importantly, our results indicate in contrast to that previous study that behavioural types do not per se affect individual functional responses assessed in the absence of external biotic stressors.
机译：功能性反应是人均摄食速率模型，其参数通常随个体的体型而定，但这些参数还可能受到个体之间始终存在差异的行为特征（即行为类型或动物性格）的进一步影响。当行为类型始终固有地害羞，缺乏活动和容易受到压力时，由于与行为相关的较低的新陈代谢率，他们无法识别或应对无风险的环境或需要较少的食物，从而可能导致内在的进食速度降低。为了测试功能响应参数的变化是由身体大小解释的，还是由行为类型解释的变化，我们分别估算了不同大小的雌性最小kill鱼（Heterandria formosa）的攻击率和处理时间，并反复测量了每个人的行为特征。我们发现，个别鱼类的攻击率和处理时间存在很大差异。行为特征随着时间的推移是稳定的，并且沿着两个不同的人格轴在个体之间一致地变化。功能反应中的个体差异仅由身体大小来解释，与我们的预期相反，而没有由探索活动和应对方式中现有的行为类型来解释。尽管依赖于行为特征的功能性反应可能为理解行为类型在食物网水平上的后果提供了一条途径，但到目前为止，我们的研究只是该主题的第二部分。重要的是，我们的结果与先前的研究相反，在没有外部生物应激源的情况下，行为类型本身并不影响评估的个体功能反应。

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