Common Eider Wintering Trends in Nova Scotia, 1970–2019

IF 0.9 4区环境科学与生态学 Q4 BIODIVERSITY CONSERVATION

Journal of Fish and Wildlife Management Pub Date : 2021-07-09 DOI:10.3996/jfwm-20-087

G. Robertson, Sarah N P Wong, Molly D. Tomlik, G. R. Milton, Glen J. Parsons, M. Mallory

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引用次数: 1

Abstract

Common eiders Somateria mollissima have been a focus of conservation and management efforts in eastern North American for over a century; however, the complex population structure and multiple subspecies make assessing the status of populations challenging. The coastlines of Nova Scotia, Canada, are an important wintering area for common eiders, and significant harvests of common eiders occur in the province. We analyzed trends in the number of wintering common eiders using the coasts of Nova Scotia from dedicated waterfowl surveys flown since 1970, and every year since 1992. We used Generalized Additive Models to assess the apparent non-linear trends in the counts of common eiders over the past 50 y. We found that numbers of common eiders wintering in Nova Scotia increased from 1970 to the early 2010s, with strong growth in the 2000s (peaking at 7% growth/y). Since the early 2010s, the growth has stopped, and the numbers are now declining. Recent declines in the population wintering in Nova Scotia corroborate other evidence that common eiders are declining in the region, and may also indicate distributional shifts of common eiders in eastern North America.

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1970年至2019年新斯科舍省常见的开斋节冬季趋势

一个多世纪以来，北美东部的普通绒鸭一直是保护和管理工作的重点;然而，复杂的种群结构和多亚种使得种群状况评估具有挑战性。加拿大新斯科舍省的海岸线是普通绒鸭的重要越冬地区，该省的普通绒鸭产量很高。我们利用新斯科舍省海岸的专用水禽调查分析了自1970年以来和自1992年以来每年进行的越冬普通绒鸭数量的趋势。我们使用广义加性模型来评估过去50年中普通绒鸭数量的明显非线性趋势。我们发现，从1970年到2010年代初，新斯科舍省越冬的普通绒鸭数量有所增加，在2000年代增长强劲(峰值增长率为7% /年)。自2010年代初以来，这种增长已经停止，现在数量正在下降。最近在新斯科舍省越冬的麋鹿数量减少，证实了该地区普通绒鸭数量减少的其他证据，也可能表明北美东部普通绒鸭的分布发生了变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Fish and Wildlife Management BIODIVERSITY CONSERVATION-ECOLOGY

CiteScore

1.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Fish and Wildlife Management encourages submission of original, high quality, English-language scientific papers on the practical application and integration of science to conservation and management of native North American fish, wildlife, plants and their habitats in the following categories: Articles, Notes, Surveys and Issues and Perspectives. Papers that do not relate directly to native North American fish, wildlife plants or their habitats may be considered if they highlight species that are closely related to, or conservation issues that are germane to, those in North America.