Quantifying gull predation in a declining Leach’s Storm-petrel ( Hydrobates leucorhous ) colony

IF 1.4 4区环境科学与生态学 Q3 BIODIVERSITY CONSERVATION

Avian Conservation and Ecology Pub Date : 2023-01-01 DOI:10.5751/ace-02388-180105

A. Bond, S. Wilhelm, Donald Pirie-Hay, G. Robertson, I. Pollet, J. Arany

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引用次数: 2

Abstract

. The effect of gull predation on sympatric seabirds has garnered much attention and management action in recent decades. In Witless Bay, Newfoundland, Canada, gulls depredate significant numbers of Leach’s Storm-petrels ( Hydrobates leucorhous ) annually. We quantified this predation on Gull Island in Witless Bay, and its effects on the storm-petrel population, by estimating the annual gull predation rate using strip transects to count storm-petrel carcasses and predicting storm-petrels’ population growth rate by repeating an island-wide breeding census. Using methods that account for island topography, we found that the Leach’s Storm-petrel breeding population on Gull Island declined to roughly 180,000 pairs in 2012 (95% CI: 130,000–230,000), a decrease of 6% per year since the last census in 2001 (352,000 pairs). Based on carcass counts, gulls, mostly American Herring Gulls ( Larus argentatus smithsonianus ), depredated 118,000–143,000 Leach’s Storm-petrels in 2012. Studies of storm-petrel recruitment, the contribution of the large non-breeding component of the population to gulls’ diets, and the consequences of gulls’ storm-petrel diet on the gulls themselves are needed to better predict the trajectory of both species into the future

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定量海鸥捕食在下降的Leach风暴海燕(Hydrobates leucorhous)群体

．近几十年来，海鸥捕食对同域海鸟的影响引起了人们的广泛关注和管理行动。在加拿大纽芬兰的威特利斯湾，海鸥每年都会大量捕杀利奇风暴海燕(Hydrobates leucorhous)。我们量化了威特斯湾海鸥岛的捕食行为，以及它对风暴海燕种群的影响，方法是利用带状样带估算海鸥的年捕食率，计算风暴海燕的尸体，并通过重复全岛范围的繁殖普查预测风暴海燕的种群增长率。使用考虑岛屿地形的方法，我们发现2012年海鸥岛上的Leach风暴海燕繁殖种群减少到大约18万对(95% CI: 13万- 23万)，自2001年上次人口普查(35.2万对)以来每年减少6%。根据尸体计数，2012年，海鸥，主要是美洲鲱鱼鸥(Larus argentatus smithsonianus)，减少了11.8万至14.3万只利奇风暴海燕。为了更好地预测这两个物种未来的发展轨迹，需要研究风暴海燕的补充、海鸥种群中大量非繁殖成分对海鸥饮食的贡献，以及海鸥的风暴海燕饮食对海鸥自身的影响

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来源期刊

Avian Conservation and Ecology BIODIVERSITY CONSERVATION-ORNITHOLOGY

CiteScore

2.20

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Avian Conservation and Ecology is an open-access, fully electronic scientific journal, sponsored by the Society of Canadian Ornithologists and Birds Canada. We publish papers that are scientifically rigorous and relevant to the bird conservation community in a cost-effective electronic approach that makes them freely available to scientists and the public in real-time. ACE is a fully indexed ISSN journal that welcomes contributions from scientists all over the world. While the name of the journal implies a publication niche of conservation AND ecology, we think the theme of conservation THROUGH ecology provides a better sense of our purpose. As such, we are particularly interested in contributions that use a scientifically sound and rigorous approach to the achievement of avian conservation as revealed through insights into ecological principles and processes. Papers are expected to fall along a continuum of pure conservation and management at one end to more pure ecology at the other but our emphasis will be on those contributions with direct relevance to conservation objectives.