Feeding while evading predators by a lotic mayfly: linking short-term foraging behaviours to long-term fitness consequences
Feeding while evading predators by a lotic mayfly: linking short-term foraging behaviours to long-term fitness consequences
复制标题
蜉蝣在躲避捕食者时进食：将短期觅食行为与长期健康后果联系起来
作者：
G. Scrimgeour;J. Culp
进行实验室实验，以量化的食物丰富度（低，高）和捕食威胁的综合影响，施加使用模式鱼（安全，风险）的健身相关（即增长，出现时间，成年体重，繁殖力，卵大小）的蜉蝣Baetis tricaudatus。这些影响是由不同的食物丰富度和捕食者威胁的组合下饲养幼虫。健身相关显着影响食物丰富，捕食威胁或这些因素的相互作用。高的食物丰富度和捕食威胁的情况下显着增加幼虫的生长速度，成年体重，繁殖力，卵的大小，并减少时间出现。捕食者威胁和食物丰富度对B适合度相关的长期影响。tricaudatus进行了比较，以前进行的短期补丁选择试验，以测试补丁选择和其潜在的长期健身后果的短期措施之间的一致性。这种比较表明，利用最多的补丁是那些产生最高的健身效益。这些结果表明，平衡死亡风险的行为成本，由于捕食对食物收购的B。三尾虫会对健康产生很大影响。
Laboratory experiments were performed to quantify the combined effects of food abundance (low, high) and predation threat, imposed using a model fish (safe, risky) on fitness correlates (i.e. growth, time to emergence, adult body mass, fecundity, egg size) of the mayfly Baetis tricaudatus. These effects were determined by rearing larvae under different combinations of food abundance and predator threat. Fitness correlates were significantly affected by food abundance, predation threat or the interaction of these factors. High food abundance and the absence of predation threat significantly increased larval growth rates, adult body mass, fecundity, egg size, and decreased time to emergence. Long-term effects of predator threat and food abundance on fitness correlates of B. tricaudatus were compared to previously conducted short-term patch choice trials to test for concordance between short-term measures of patch choice and their potential longer-term fitness consequences. This comparison indicated that patches that were utilized the most were those that yielded the highest fitness benefits. These results suggest that behavioural costs of balancing mortality risk due to predation against food acquisition by B. tricaudatus can have strong fitness consequences.