Anne Hoover-Miller Alaska SeaLife Center Photo: DW Miller.

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Presentation transcript:

Anne Hoover-Miller Alaska SeaLife Center Photo: DW Miller

Gulf of Alaska Harbor Seal Trend: Tugidak Island Tugidak Island ’s - 90% : Molt 3.0%/yr Pups 5.4%/yr Kodiak Island area %/yr From: Pendleton and Wolfe 2005 Alaska Department of Fish & Game

Harbor Seal Population Trend: Prince William Sound PWS % %/yr ? From: Pendleton and Wolfe 2005 Alaska Department of Fish & Game

Kenai Fjords Study Areas  Kenai Fjords Region –Focal areas: Aialik Bay: Glacial Ice Aialik Bay: Glacial Ice Day Harbor: Land Haulouts Day Harbor: Land Haulouts –Regional Surveys

Aialik Bay: Seals on Ice Tidewater Glacier Habitat Aialik Glacier Head of 30 km long fjord Pedersen Glacier Abuts tidally influenced lake Counts have been conducted intermittently since 1979 B. Hoover

Glacier Habitats Differ Aialik Glacier Pedersen Glacier B. Hoover

Aialik Glacier: Ice on the move

Pedersen Lake

Past Research:   : – – Behavior and Ecology of Harbor Seals Inhabiting Glacial Ice in Aialik Bay (Hoover 1983) Population dynamics Demography Habitat use – – Response of Seals to Human Disturbance (Murphy and Hoover 1981)   NPS continued monitoring, with emphasis in 1989, 1994, and 1995.

 Remote Video Monitoring – Ecology & Population Biology – Glacier Ice Environments – Human Interactions Caroline Jezierski Poster  Aerial Surveys Current Research:

: Remote Video Monitoring Camera control commands sent from ASLC to cameras via UHF transmissions Video transmission received via microwave

Aialik Bay Trends: Total Seals Pups % (17%/yr) Stable % (45%/yr) % (13%/yr) %/yr %/yr

Total Seals (Molt) Pups Aialik Bay Trends:

Molt: 1,165 seals in ,508 seals in 2005 _______ 30% Regional Increase during Molt Pupping, Excluding McCarty Fjord : 541 seals in seals in 2005 _______ Similar numbers during Pupping

Proportion of Tugidak, Aialik, Day Harbor and Prince William Sound (relative to 1983):

How similar are trends throughout the Gulf of Alaska?

Proportion of AT1 Pod Killer Whales relative to seal populations they prey on EVOS

Summary   Population decline of harbor seals included land and glacial ice habitats on the outer Kenai Peninsula   Magnitude of decline since 1983 shows similarities between areas   Recovery in each area shows different trajectories that may be related to local environmental change (bottom-up factors)   Stabilization and recovery in the Kenai Fjords and Prince William Sound coincides with reduced numbers of killer whales (top- down effects).

Collaborators P. Armato, OASLC, NPS S. Atkinson, ASLC, UAF/SFOS SeeMore Wildlife Inc. Port Graham Corporation U.S. Fish and Wildlife Service, National Maritime Wildlife Refuge System National Marine Fisheries Service University of Alaska, Fairbanks Permits: NMFS , NPS KEFJ-2004-SCI-0001, USFWS Field and Video Monitoring Personnel: R. Day, K. Oakley, T. Carpenter, D. Miller, C. Miller, M. Tetreau, J. Pfeiffenberger, S. Pfeiffenberger, G. Smith, K. Link, W. Bryden, J.Welsh, S. Brennan, P. Salzman, K. Wilson, K. Felitz, S. Aughe, L. O’Brien, L. Dickinson, J. Follin, T. Mauro, M. Sternberg, K. Heffron, R. Pearce and C. Jezierski.