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首页> 外文期刊>Southeastern naturalist >Influence of abiotic factors on activity in a larval stream salamander assemblage
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Influence of abiotic factors on activity in a larval stream salamander assemblage

机译：非生物因素对幼体sal集合体活性的影响

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摘要

Larval stream salamanders are the numerically dominant predators in many headwater stream systems. Nonetheless, little is known about their activity patterns or the extent to which their movements are influenced by prevailing environmental conditions. In this study, we used capture rates from passive trapping as an index of activity level and sought to identify the environmental variables most responsible for fluctuations in larval stream salamander activity. Over the course of two months, we captured stream salamanders in aquatic funnel traps during both day- and night-trapping sessions at a first-order stream in the North Carolina Piedmont. Using an information-theoretic approach, we constructed models to elucidate the effects of (1) water temperature, (2) cloud cover, (3) days since last rainfall, and (4) time of day on larval salamander activity. We found that the model incorporating time of day and cloud cover was the best predictor of larval salamander activity. In our study, larval salamander activity was highest at night and also demonstrated a weak positive correlation with increasing cloud cover. Using model-averaging, we further determined that our time of day and cloud cover variables demonstrated a significant correlation with observed activity levels. This pattern of peak activity under low light conditions could be a behavioral adaptation that limits predation risk for larval salamanders.
机译：幼虫stream是许多上游水流系统中数量上占主导地位的食肉动物。但是，人们对其活动方式或活动受到主要环境条件影响的程度知之甚少。在这项研究中，我们使用被动诱捕的捕获率作​​为活动水平的指标，并试图找出最能引起幼体sal活动波动的环境变量。在两个月的过程中，我们在北卡罗莱纳州皮埃蒙特的一级流白天和晚上诱捕期间，在水道漏斗中捕获了流sal。使用信息理论方法，我们构建了模型来阐明（1）水温，（2）云量，（3）自上次降雨以来的天数以及（4）一天中的时间对幼虫sal活动的影响。我们发现，包含一天中的时间和云量的模型是幼虫sal活动的最佳预测指标。在我们的研究中，幼虫sal活动在夜间最高，并且还显示出与云量增加的弱正相关。使用模型平均，我们进一步确定了一天中的时间和云层覆盖变量显示出与观测到的活动水平显着相关。这种在弱光条件下的峰值活动模式可能是一种行为适应，可以限制幼体sal捕食的风险。

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