Shade seeking by Common Grackle (Quiscalus quiscula) nestlings at the scale of the nanoclimate |
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| Authors: | B Glassey M Amos |
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| Institution: | 1. Université Pierre et Marie Curie, Equipe Adaptations aux Milieux Extrêmes, UMR 7138 SAE, Quai St Bernard, 75252 Cedex 5 Paris, France;2. Ocean and Earth Science, University of Southampton, European Way, Southampton SO14 3ZH, UK;3. Centre of IMAR of the University of the Azores, Department of Oceanography and Fisheries/UAz—LARSyS Associated Laboratory, 9901-862 Horta, Portugal;4. MARE-Marine and Environmental Science Center, University of the Azores, 9901-862 Horta, Azores, Portugal;5. Rua José Saramago, Montenegro, 8005-181 Faro, Portugal;1. Neuroscience Institute and Center for Behavioral Neuroscience, Georgia State University, P.O. Box 5030, Atlanta, GA 30302-5030, USA;2. Centro de Investigacion en Reproduccion Animal, CINVESTAV-UAT, Apdo. Postal 62, 90000 Tlaxcala, Tlax., Mexico;3. Department of Neuroscience, University of Minnesota, 6-145 Jackson Hall, 321 Church St SE, Minneapolis, MN 55455, USA |
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| Abstract: | Solar radiation is a major source of heat for open-cup passerine nestlings, and a key variable influencing parental nest site selection. Although temperature, like food, is critical for nestling growth and survival, the use of thermal and insolation gradients when describing passerine nestling orientation and movement within the open-cup nest has not been explored. Our study used the Common Grackle (Quiscalus quiscula) as a model system to directly test the hypothesis that passerine nestlings mitigate thermal extremes behaviourally. Pairs of nestlings were tested in shaded (homogeneous) and exposed (heterogeneous) nests, movements within nests were tracked and nest temperatures recorded. Our results show that nestlings are able to detect and respond to nanoclimate heterogeneity, and can mitigate short-term radiant heat loads through shade-seeking. |
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