Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea

Martin Renner; Sigrid Salo; Lisa B. Eisner; Kathy J. Kuletz; Jarrod A. Santora; Patrick Ressler; Carol Ladd; John F. Piatt; Gary S. Drew; George L. Hunt

doi:10.1098/rsbl.2016.0276

USGS · 70215609

Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea

Martin Renner·Sigrid Salo·Lisa B. Eisner·Kathy J. Kuletz·Jarrod A. Santora·Patrick Ressler·Carol Ladd·John F. Piatt·Gary S. Drew·George L. Hunt

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Abstract

Timing of spring sea-ice retreat shapes the southeast Bering Sea food web. We compared summer seabird densities and average bathymetry depth distributions between years with early (typically warm) and late (typically cold) ice retreat. Averaged over all seabird species, densities in early-ice-retreat-years were 10.1% (95% CI: 1.1–47.9%) of that in late-ice-retreat-years. In early-ice-retreat-years, surface-foraging species had increased numbers over the middle shelf (50–150 m) and reduced numbers over the shelf slope (200–500 m). Pursuit-diving seabirds showed a less clear trend. Euphausiids and the copepod Calanus marshallae/glacialis were 2.4 and 18.1 times less abundant in early-ice-retreat-years, respectively, whereas age-0 walleye pollock Gadus chalcogrammus near-surface densities were 51× higher in early-ice-retreat-years. Our results suggest a mechanistic understanding of how present and future changes in sea-ice-retreat timing may affect top predators like seabirds in the southeastern Bering Sea.

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Biology Letters Article

Source-reported bounding extent: 51.86292391360244° to 59.265880628258095° latitude; -175.2099609375° to -157.1923828125° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Martin Renner, Sigrid Salo, Lisa B. Eisner, Kathy J. Kuletz, Jarrod A. Santora, Patrick Ressler, Carol Ladd, John F. Piatt, Gary S. Drew, George L. Hunt. 2016. Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea. https://doi.org/10.1098/rsbl.2016.0276

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