ASSESSING THE BREEDING DISTRIBUTION AND POPULATION TRENDS OF THE ALEUTIAN TERN ONYCHOPRION ALEUTICUS
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, e...
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Veröffentlicht in: | Marine ornithology 2015-10, Vol.43 (2), p.179-187 |
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creator | Renner, Heather M Romano, Marc D Renner, Martin Pyare, Sanjay Goldstein, Michael I Artukhin, Yuri |
description | 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 [ |
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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, with large colonies experiencing greater declines than small colonies. 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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, with large colonies experiencing greater declines than small colonies. 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.</abstract><tpages>9</tpages></addata></record> |
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subjects | Marine |
title | ASSESSING THE BREEDING DISTRIBUTION AND POPULATION TRENDS OF THE ALEUTIAN TERN ONYCHOPRION ALEUTICUS |
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