Accurate abundance estimation of cliff-breeding Bounty Island shags using drone-based 2D and 3D photogrammetry

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-02496-180206
Thomas Mattern, Klemens Pütz, Hannah Mattern, David Houston, Robin Long, Bianca Keys, Jeff White, Ursula Ellenberg, Pablo Garcia-Borboroglu
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Abstract

Effective seabird management strategies rely on accurate population estimates, with previous methods typically employing ground counts of a target species. However, difficult and often inaccessible breeding habitats are now able to be explored due to recent technological advancements in Unoccupied Aerial Vehicles (UAVs). This study tested a novel approach by combining high-resolution orthomosaics and 3D models to provide population estimates of the remote cliff-breeding Bounty Island shag (Leucocarbo ranfurlyi) on the sub-Antarctic Bounty Islands in November 2022. Our results report 573 breeding pairs, estimating a total population of approximately 1733 birds, breeding on 13 of the 14 main islands. Given the topographical constraints of surveying the islands by boat, the most comparable assessment in 1978 shows a similar count of breeding pairs, proposing the Bounty Island shag population is stable. However, long-term monitoring and additional research surrounding foraging strategies is crucial for developing conservation efforts for one of the rarest and spatially restricted shag species in the world. Our study demonstrates a reproducible method for estimating elusive wildlife populations that can be used across species with wider applications.
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使用基于无人机的2D和3D摄影测量对悬崖繁殖的邦蒂岛鲨鱼进行准确的丰度估计
有效的海鸟管理策略依赖于准确的种群估计,而以前的方法通常采用目标物种的地面计数。然而,由于无人驾驶飞行器(uav)的最新技术进步,现在能够探索困难且通常无法进入的繁殖栖息地。这项研究测试了一种新方法,将高分辨率正形图和3D模型相结合,提供了2022年11月亚南极邦蒂群岛上偏远悬崖繁殖邦蒂岛鲨(Leucocarbo ranfurlyi)的种群估计。我们的研究结果报告了573对繁殖鸟类,估计总数约为1733只,在14个主要岛屿中的13个岛屿上繁殖。考虑到用船测量岛屿的地形限制,1978年最具可比性的评估显示了相似的繁殖对数量,这表明邦蒂岛的长尾鲨数量是稳定的。然而,长期监测和围绕觅食策略的额外研究对于发展保护工作至关重要,这是世界上最稀有和空间限制的物种之一。我们的研究展示了一种可重复的方法来估计难以捉摸的野生动物种群,这种方法可以跨物种使用,具有更广泛的应用。
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来源期刊
Avian Conservation and Ecology
Avian Conservation and Ecology BIODIVERSITY CONSERVATION-ORNITHOLOGY
CiteScore
2.20
自引率
7.10%
发文量
43
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.
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