Taking a tern for the worse?
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Transcript of Taking a tern for the worse?
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Taking a tern for the worse?
When do we raise a red flag for O. aleuticus?
Photo: Martin Renner
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Contributors
Bering Sea: B. McCaffery, S. Savage, M. Swaim, R. MacDonald, A. Harding, K. Sowl, C. Gales, A. Kholsa, S. Minton, J. Schwarz
Aleutian Islands: I. Helmericks, Attours, J. Puschock, M. Schwitters, L. Spitler, J. Williams, D. RudisChukchi Sea: R. Meyers, T. Moran, M. Johnson, S. Georgette
Gulf of Alaska: S. Oehlers, E. Cooper, N. Catterson, M. Kissling, K. Kuletz, M. Renner, C. FieldKodiak: R. Corcoran, R. MacIntosh, S. Stephensen
Synergistic: H. Renner, M. Romano, N. Rojek, M. Goldstein, S. Pyare, J. Frederick, M. Renner, R. GillData contributors:
Photo: Martin Renner
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Aleutian tern fast facts
• What’s in a name?
Photo: Martin Renner
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Aleutian tern fast facts
Photo: Martin Renner
Info gaps
Distribution Colony characteristics
Wintering location
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Worldwide distribution
Distribution map from BirdLife International / IUCN
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Historic distribution in AlaskaHistoric distribution in Alaska
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Why are so few studying Aleutian terns?
Photo: Martin Renner
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A big exception – USFS/UAS study
• Geolocators• Census methods
Photos by Jeff Frederick
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Yakutat
Copper River Delta
Kachemak Bay
Gulf of AlaskaHistoric colonies (pre-1995)
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Yakutat
Copper River Delta
Kachemak Bay
Gulf of AlaskaRed shows
recent counts
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1980 30002008 15002009 pres. through early June, abandoned by early July, no est.2010 5002011 500 (early abandonment, no successful breeding)2012 850 birds in mind June, no presence after mid June
Black Sand Spit Colony
Yakutat Area
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KodiakHistoric colonies (pre-1995)
Photo: Robin Corcoran / USFWS
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KodiakRed shows
recent counts
Photo: Robin Corcoran / USFWS
KodiakRed shows
recent counts
Photo: Robin Corcoran / USFWS
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Aleutian Islands-Bering-Chukchi
Historic colonies (pre-1995)
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Aleutian Islands-Bering-Chukchi
Red shows recent counts
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Historic and recent Aleutian Tern colony counts
Excluding areas not censused since 1995, mostly Bering Sea and Controller Bay
*Yakutat accounts for 80% of Gulf of AK and 54% of AK total
Recent count % total change since 1995Chukchi Sea 22 1 -83%Bering Sea 200 8 -79%Aleutian Islands 250 10 -67%Kodiak 418 16 -94%Gulf of AK 1649* 65 -77%Total 2539 -85%
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Current statewide status
85% decline!
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Photo: Martin Renner
So what’s up?
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Status in Russia
Sakhalin Island
SW Kamchatka Peninsula
Koryak Upland
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Data from North Pacific Pelagic Seabird DatabaseMap /interpolation by M. Renner
Aleutian Tern At-Sea Observations
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Data from NPPSDMap by M. Renner
Anomaly in at-sea observations by decade
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• Breeding grounds• Wintering grounds• Both apparently
declining in AK
Compare to Arctic tern
Photo: Martin Renner
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Photo: Martin Renner
Photo: Jeff Frederick
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Conclusions*Some evidence for 85% decline statewide Lots of caveats on the data Apparently increasing in Russia
*Single statewide coast survey could answer many Q’s*Need for multi-agency support
Photo: Martin Renner