6
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

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

      Proceedings of the National Academy of Sciences of the United States of America
      Analysis of Variance, Animals, Corticosterone, blood, Disasters, Ecuador, Iguanas, physiology, Radioimmunoassay, Reproducibility of Results, Seawater, Stress, Psychological, Survival, Weather

      Read this article at

      ScienceOpenPublisherPMC
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          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.

          Related collections

          Author and article information

          Journal
          11416210
          34674
          10.1073/pnas.131091498

          Chemistry
          Analysis of Variance,Animals,Corticosterone,blood,Disasters,Ecuador,Iguanas,physiology,Radioimmunoassay,Reproducibility of Results,Seawater,Stress, Psychological,Survival,Weather

          Comments

          Comment on this article