Thorne L. H., Hazen E. L., Bograd S. J., Foley D. G., Conners M. G., Kappes M. A., Kim H. M., Costa D. P., Tremblay Yann, Shaffer S. A. (2015). Foraging behavior links climate variability and reproduction in North Pacific albatrosses. Movement Ecology, 3, p. art. 27 [15 p.]. ISSN 2051-3933.
Titre du document
Foraging behavior links climate variability and reproduction in North Pacific albatrosses
Année de publication
2015
Auteurs
Thorne L. H., Hazen E. L., Bograd S. J., Foley D. G., Conners M. G., Kappes M. A., Kim H. M., Costa D. P., Tremblay Yann, Shaffer S. A.
Source
Movement Ecology, 2015,
3, p. art. 27 [15 p.] ISSN 2051-3933
Background: Climate-driven environmental change in the North Pacific has been well documented, with marked effects on the habitat and foraging behavior of marine predators. However, the mechanistic linkages connecting climate-driven changes in behavior to predator populations are not well understood. We evaluated the effects of climate-driven environmental variability on the reproductive success and foraging behavior of Laysan and Black-footed albatrosses breeding in the Northwest Hawaiian Islands during both brooding and incubating periods. We assessed foraging trip metrics and reproductive success using data collected from 2002-2012 and 1981-2012, respectively, relative to variability in the location of the Transition Zone Chlorophyll Front (TZCF, an important foraging region for albatrosses), sea surface temperature (SST), Multivariate ENSO Index (MEI), and the North Pacific Gyre Oscillation index (NPGO). Results: Foraging behavior for both species was influenced by climatic and oceanographic factors. While brooding chicks, both species traveled farther during La Nina conditions, when NPGO was high and when the TZCF was farther north (farther from the breeding site). Models showed that reproductive success for both species showed similar trends, correlating negatively with conditions observed during La Nina events (low MEI, high SST, high NPGO, increased distance to TZCF), but models for Laysan albatrosses explained a higher proportion of the variation. Spatial correlations of Laysan albatross reproductive success and SST anomalies highlighted strong negative correlations (> 95 %) between habitat use and SST. Higher trip distance and/or duration during brooding were associated with decreased reproductive success. Conclusions: Our findings suggest that during adverse conditions (La Nina conditions, high NPGO, northward displacement of the TZCF), both Laysan and Black-footed albatrosses took longer foraging trips and/ or traveled farther during brooding, likely resulting in a lower reproductive success due to increased energetic costs. Our results link climate variability with both albatross behavior and reproductive success, information that is critical for predicting how albatross populations will respond to future climate change.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
;
Ecologie, systèmes aquatiques [036]
;
Sciences du monde animal [080]
Description Géographique
PACIFIQUE ; HAWAI ; TERN ILE
Localisation
Fonds IRD [F B010074440]
Identifiant IRD
fdi:010074440
