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Volume 43, No. 2

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Assessing the breeding distribution and population trends of the Aleutian Tern Onychoprion aleutica


Authors

HEATHER M. RENNER1, MARC D. ROMANO1, MARTIN RENNER2, SANJAY PYARE3, MICHAEL I. GOLDSTEIN4 & YURI ARTUKHIN5
1Alaska Maritime National Wildlife Refuge, 95 Sterling Hwy, Ste. 1, Homer, AK 99603, USA (heather_renner@fws.gov)
2Tern Again Consulting, 388 E. Bayview Ave, Homer, AK 99603, USA
3University of Alaska Southeast, 11120 Glacier Hwy., Juneau, AK 99801, USA
4US Forest Service, PO Box 21629, Juneau AK 99802, USA
5Kamchatka Branch of Pacific Geographical Institute of Far Eastern Branch RAS, Rybakov Prospekt 19a, Petropavlovsk-Kamchatsky, 683024, Russian Federation

Citation

RENNER, H.M., ROMANO, M.D., RENNER, M., PYARE, S., GOLDSTEIN, M.I. & ARTHUKIN, Y. 2015. Assessing the breeding distribution and population trends of the Aleutian Tern Onychoprion aleutica. Marine Ornithology 43: 179 - 187
http://doi.org/10.5038/2074-1235.43.2.1129

Received 26 February 2015, accepted 19 May 2015

Date Published: 2015/10/15
Date Online: 2017/02/28
Key words: Alaska, Aleutian Tern, colony counts, population change, Russia, world population

Abstract

We compiled survey data on 202 Aleutian Tern colonies throughout Alaska and Russia to assess the current status and colony sizes and to evaluate whether there had been changes in recent decades. We fit a Poisson generalized linear mixed model to all available counts of Alaskan colonies since 1960, excluding colonies in which the temporal spread of counts was < 6 years. Russian data were not included in the trend model due to our inability to resolve dates on a number of counts. We estimate that numbers at known colonies in Alaska have declined 8.1% annually since 1960 or 92.9% over three generations (33 years; 95% CI = 83.3%–97%), with large colonies experiencing greater declines than small colonies. Trends at known colonies within discrete geographic regions of Alaska (Aleutian Islands, Bering Sea, Chukchi Sea, Gulf of Alaska and Kodiak Island) were consistently negative. The most recent counts of all known Alaskan colonies summed to 5 529 birds. This estimate should be considered a rough minimum because it does not account for colonies that have not been surveyed in recent years — the size of which may have changed — or for the fact that the surveys conducted were neither systematic nor inclusive of all potential habitats. In Russia, the sum of the most recent count of all colonies was 25 602 individuals, indicating that Russia may host approximately 80% of the world population. Numbers in some regions in Russia appear to have increased substantially in recent decades, especially on Sakhalin Island and the southern coast of the Koryak Highland. We have no data to identify any population-level stressor that could explain the apparent reduction in numbers in Alaska. However, predation, egging and other anthropogenic disturbances, and degraded habitat may cause population change at local levels. If this overall pattern cannot be explained by other possible but unlikely factors (e.g. establishment of large colonies in new locations within Alaska, or major shifts between Alaska and Russia), then the observed trends in Alaska are, indeed, alarming. Therefore, we urge close monitoring of known colonies within Alaska, studies of dispersal, establishment of management practices to insulate colonies from human disturbance, and more concerted efforts among Alaskan and Russian partners. 

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