Supplementary material from "Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea"
Posted on 2016-09-13 - 07:41
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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Renner, Martin; Salo, Sigrid; Eisner, Lisa B.; Ressler, Patrick; Ladd, Carol; J. Kuletz, Kathy; et al. (2016). Supplementary material from "Timing of ice retreat alters seabird abundances and distributions in the southeast Bering Sea". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3464553.v1