Central place foragers select ocean surface convergent features despite differing foraging strategies

TitleCentral place foragers select ocean surface convergent features despite differing foraging strategies
Publication TypeJournal Article
Year of Publication2019
AuthorsOliver M.J, Kohut J.T, Bernard K., Fraser W., Winsor P., Statscewich H., Fredj E., Cimino M., Patterson-Fraser D., Carvalho F.
JournalScientific Reports
Date Published2019/01
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000455951300005
KeywordsAntarctic krill; climate; dimethyl sulfide; paradigm; Science & Technology - Other Topics; search; transport

Discovering the predictors of foraging locations can be challenging, and is often the critical missing piece for interpreting the ecological significance of observed movement patterns of predators. This is especially true in dynamic coastal marine systems, where planktonic food resources are diffuse and must be either physically or biologically concentrated to support upper trophic levels. In the Western Antarctic Peninsula, recent climate change has created new foraging sympatry between Adelie (Pygoscelis adeliae) and gentoo (P. papua) penguins in a known biological hotspot near Palmer Deep canyon. We used this recent sympatry as an opportunity to investigate how dynamic local oceanographic features affect aspects of the foraging ecology of these two species. Simulated particle trajectories from measured surface currents were used to investigate the co-occurrence of convergent ocean features and penguin foraging locations. Adelie penguin diving activity was restricted to the upper mixed layer, while gentoo penguins often foraged much deeper than the mixed layer, suggesting that Adelie penguins may be more responsive to dynamic surface convergent features compared to gentoo penguins. We found that, despite large differences in diving and foraging behavior, both shallow-diving Adelie and deeper-diving gentoo penguins strongly selected for surface convergent features. Furthermore, there was no difference in selectivity for shallow-versus deep-diving gentoo penguins. Our results suggest that these two mesopredators are selecting surface convergent features, however, how these surface signals are related to subsurface prey fields is unknown.

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