Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea |
| Series title | Biology Letters |
| DOI | 10.1098/rsbl.2016.0276 |
| Volume | 12 |
| Issue | 9 |
| Year Published | 2016 |
| Language | English |
| Publisher | Royal Society Publishing |
| Contributing office(s) | Alaska Science Center Biology MFEB |
| Description | 20160276, 7 p. |
| Country | United States |
| State | Alaska |
| Other Geospatial | southeastern Bering Sea |
| Google Analytic Metrics | Metrics page |