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Pacific herring (Clupea pallasii) consumption by marine birds during winter in Prince William Sound, Alaska

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Following the 1989 MV Exxon Valdez oil spill (EVOS) and subsequent herring population collapse in Alaska’s
Prince William Sound (PWS), the Pacific herring (Clupea pallasii) fishery was closed. In the 25 yr since
EVOS, herring and several herring-dependent marine bird species have failed to reach pre-spill population levels. One hypothesis is that intense predation pressure may be inhibiting herring recovery. To inform herring modeling efforts, this study estimated marine bird consumption of juvenile and adult herring in PWS for 10 winters over an 18-yr period (1989–90 through 2006–2007). Total estimated herring consumption by wintering marine birds averaged 2409
950 t, indicating that avian consumption represents a substantial and inter-annually variable source of herring mortality. Common murre (Uria aalge) consumed the greatest portion (16–80%) of herring in all years among marine bird species. Juvenile herring biomass consumed annually by common murre was greater than murre consumption of adult herring biomass. Time lag analyses showed that marine bird consumption of adult herring is negatively correlated with the amount of herring spawn observed in subsequent years, but such effects were not observed more than 2 yr. Our models indicate that during years in which herring recruitment is low or bird populations are particularly large, marine birds can consume up to 10% of the annual adult herring biomass. Our results highlight the importance of herring to wintering PWS birds.We propose that future management of herring stocks seeks to reduce negative impacts on marine birds that prey on herring.

Key words: Alaska, avian predation, bioenergetics, Clupea pallasii, common murre, Prince William Sound

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Ketersediaan

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Informasi Detail

Judul Seri

Fisheries oceanography

No. Panggil

-

Penerbit

U.S.A : John Wiley & Sons Ltd., 2014

Deskripsi Fisik

Fisheries oceanography 2014

Bahasa

English

ISBN/ISSN

doi:10.1111/fog.1207

Klasifikasi

-

Tipe Isi

-

Tipe Media

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Tipe Pembawa

-

Edisi

24:1, 1–13, 2015

Subjek

PERIKANAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mutia/Agus

Versi lain/terkait

Lampiran Berkas

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