@article{Woodley2003-06Effec-42538,
  year={2003},
  doi={10.1016/S0016-6480(03)00085-6},
  title={Effect of tidal cycle and food intake on the baseline plasma corticosterone rhythm in intertidally foraging marine iguanas},
  number={2},
  volume={132},
  issn={0016-6480},
  journal={General and Comparative Endocrinology},
  pages={216--222},
  author={Woodley, Sarah K. and Painter, Danika L. and Moore, Michael C. and Wikelski, Martin and Romero, L. Michael}
}

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    <dc:creator>Woodley, Sarah K.</dc:creator>
    <dc:creator>Wikelski, Martin</dc:creator>
    <dc:contributor>Wikelski, Martin</dc:contributor>
    <dcterms:abstract xml:lang="eng">In most species, plasma levels of baseline glucocorticoids such as corticosterone (B) have a circadian rhythm. This rhythm can be entrained by both photoperiod and food intake and is related to aspects of energy intake and metabolism. Marine iguanas (Amblyrhynchus cristatus) offer a unique opportunity to better understand the relative importance of the light:dark cycle versus food intake in influencing the rhythm in baseline B in a natural system. Compared to other species, food intake is not as strictly determined by the phase of the light:dark cycle. Animals feed in the intertidal zone so feeding activity is heavily influenced by the tidal cycle. We measured baseline plasma B levels in free-living iguanas over several 24-h periods that varied in the timing of low tide/foraging activity. We found that baseline B levels were higher during the day relative to night. However, when low tide occurred during the day, baseline B levels dropped coincident with the timing of low tide. Whether the baseline B rhythm (including the drop during foraging) is an endogenous rhythm with a circatidal component, or is simply a result of feeding and associated physiological changes needs to be tested. Together, these data suggest that the baseline B rhythm in marine iguanas is influenced by the tidal cycle/food intake as well as the light:dark cycle.</dcterms:abstract>
    <dcterms:issued>2003-06</dcterms:issued>
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    <dc:contributor>Painter, Danika L.</dc:contributor>
    <dcterms:title>Effect of tidal cycle and food intake on the baseline plasma corticosterone rhythm in intertidally foraging marine iguanas</dcterms:title>
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    <dc:contributor>Woodley, Sarah K.</dc:contributor>
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    <dc:creator>Romero, L. Michael</dc:creator>
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    <dc:creator>Moore, Michael C.</dc:creator>
    <dc:contributor>Moore, Michael C.</dc:contributor>
    <dc:creator>Painter, Danika L.</dc:creator>
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