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      Stress, reproduction, and adrenocortical modulation in amphibians and reptiles

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      Hormones and Behavior
      Elsevier BV

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          Corticosterone levels predict survival probabilities of Galapagos marine iguanas during El Nino events.

          Plasma levels of corticosterone are often used as a measure of "stress" in wild animal populations. However, we lack conclusive evidence that different stress levels reflect different survival probabilities between populations. Galápagos marine iguanas offer an ideal test case because island populations are affected differently by recurring El Niño famine events, and population-level survival can be quantified by counting iguanas locally. We surveyed corticosterone levels in six populations during the 1998 El Niño famine and the 1999 La Niña feast period. Iguanas had higher baseline and handling stress-induced corticosterone concentrations during famine than feast conditions. Corticosterone levels differed between islands and predicted survival through an El Niño period. However, among individuals, baseline corticosterone was only elevated when body condition dropped below a critical threshold. Thus, the population-level corticosterone response was variable but nevertheless predicted overall population health. Our results lend support to the use of corticosterone as a rapid quantitative predictor of survival in wild animal populations.
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            Increased pre-natal maternal corticosterone promotes philopatry of offspring in common lizards Lacerta vivipara

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              Oxygen Consumption during Resting, Calling, and Nest Building in the Frog Physalaemus Pustulosus

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                Author and article information

                Journal
                Hormones and Behavior
                Hormones and Behavior
                Elsevier BV
                0018506X
                January 2003
                January 2003
                : 43
                : 1
                : 39-47
                Article
                10.1016/S0018-506X(02)00038-7
                3a4d33e8-c665-45b2-a141-9c33f7411c17
                © 2003

                http://www.elsevier.com/tdm/userlicense/1.0/


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