作者
Eva K Fischer, Rayna M Harris, Hans A Hofmann, Kim L Hoke
发表日期
2014/2/28
期刊
Hormones and behavior
卷号
65
期号
2
页码范围
165-172
出版商
Academic Press
简介
In vertebrates, glucocorticoids mediate a wide-range of responses to stressors. For this reason, they are implicated in adaptation to changes in predation pressure. Trinidadian guppies (Poecilia reticulata) from high-predation environments have repeatedly and independently colonized and adapted to low-predation environments, resulting in parallel changes in life history, morphology, and behavior. We validated methods for non-invasive waterborne hormone sample collection in this species, and used this technique to examine genetic and environmental effects of predation on basal glucocorticoid (cortisol) levels. To examine genetic differences, we compared waterborne cortisol levels in high- and low-predation fish from two distinct population pairs. We found that fish from high-predation localities had lower cortisol levels than their low-predation counterparts. To isolate environmental influences, we compared …
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EK Fischer, RM Harris, HA Hofmann, KL Hoke - Hormones and behavior, 2014