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Full-Text Articles in Marine Biology
Foraging Tactics In Dynamic Sea-Ice Habitats Affect Individual State In A Long-Ranging Seabird, Arnaud Tarroux, Yves Cherel, Per Fauchald, Akiko Kato, Oliver P. Love, Yan Ropert-Coudert, Gunnar Spreen, Øystein Varpe, Henri Weimerskirch, Nigel G. Yoccoz, Sandrine Zahn, Sébastien Descamps
Foraging Tactics In Dynamic Sea-Ice Habitats Affect Individual State In A Long-Ranging Seabird, Arnaud Tarroux, Yves Cherel, Per Fauchald, Akiko Kato, Oliver P. Love, Yan Ropert-Coudert, Gunnar Spreen, Øystein Varpe, Henri Weimerskirch, Nigel G. Yoccoz, Sandrine Zahn, Sébastien Descamps
Great Lakes Institute for Environmental Research Publications
Individual heterogeneity in diet and foraging behaviour is common in wild animal populations, and can be a strong determinant of how populations respond to environmental changes. Within populations, variation in foraging behaviour and the occurrence of individual tactics in relation to resources distribution can help explain differences in individual fitness, and ultimately identify important factors affecting population dynamics. We examined how foraging behaviour and habitat during the breeding period related to the physiological state of a long-ranging seabird adapted to sea ice, the Antarctic petrel Thalassoica antarctica. Firstly, using GPS tracking and state-switching movement modelling (hidden Markov models) on 124 …
Employing Individual Measures Of Baseline Glucocorticoids As Population-Level Conservation Biomarkers: Considering Within-Individual Variation In A Breeding Passerine, Christine L. Madliger, Oliver P. Love
Employing Individual Measures Of Baseline Glucocorticoids As Population-Level Conservation Biomarkers: Considering Within-Individual Variation In A Breeding Passerine, Christine L. Madliger, Oliver P. Love
Great Lakes Institute for Environmental Research Publications
Labile physiological variables, such as stress hormones [i.e. glucocorticoids (GCs)], allow individuals to react to perturbations in their environment and may therefore reflect the effect of disturbances or positive conservation initiatives in advance of population-level demographic measures. Although the application of GCs as conservation biomarkers has been of extensive interest, few studies have explicitly investigated whether baseline GC concentrations respond to disturbances consistently across individuals. However, confirmation of consistent responses is of paramount importance to assessing the ease of use of GCs in natural systems and to making valid interpretations regarding population-level change (or lack of change) in GC concentrations. …