Missing piece of top predator‐based conservation: Demographic analysis of an owl population on a remote subtropical island
Missing piece of top predator‐based conservation: Demographic analysis of an owl population on a remote subtropical island
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基于捕食者的顶级保护的缺失：对偏远亚热带岛屿上猫头鹰种群的人口统计分析
DOI：
10.1002/1438-390x.12080
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发表时间：
2021
影响因子：
1.7
通讯作者：
Takagi Masaoki
中科院分区：
文献类型：
--
作者：
Sawada Akira;Iwasaki Tetsuya;Inoue Chitose;Nakaoka Kana;Nakanishi Takumi;Sawada Junpei;Aso Narumi;Nagai Syuya;Ono Haruka;Takagi Masaoki
顶级掠食者经常是保护计划的目标。猫头鹰是这样的掠食者。然而，以往的研究都偏向于在温带地区的物种，而大多数猫头鹰物种发生在热带或亚热带地区，研究不足。此外，猫头鹰往往是岛屿特有的，其保护状况不明。这些物种的人口统计数据特别稀少，尽管它们对于启动和促进养护工作至关重要。作为热带或亚热带地区和岛屿上猫头鹰人口统计分析的案例研究，我们将综合人口模型应用于日本南大东岛琉球角鸮人口的7年监测数据（2012-2018）。我们使用了903个个体的生存史数据，213个育雏的繁殖和性比数据，以及总共2，526个个体的计数数据。成年女性的长期平均年存活率为0.73，成年男性为0.74，尽管性别差异不显著。性别比估计值每年波动，长期平均值略微偏向雄性：雏鸟为0.51，一岁鸽为0.54，成年鸽为0.52。估计长期平均种群规模为273.4名女性和296.8名男性。人口增长率的长期平均值为0.98，表明略有下降趋势。幸运的是，在早期阶段就认识到了下降的趋势。考虑到热带或亚热带地区和岛屿上猫头鹰的基本生态数据普遍缺乏，许多濒临灭绝的猫头鹰种群可能正在等待保护工作。
Top predators are frequently the target of conservation programs. Owls are such predators. However, previous studies of owls are biased to species occurring in temperate regions, whereas most owl species occur in tropical or subtropical regions and are understudied. Furthermore, owls are often endemic to islands and of unknown conservation status. Demographic data for such species are especially scarce although they are essential for initiating and promoting their conservation. As a case study of demographic analysis of owls in a tropical or subtropical area and on islands, we applied an integrated population model to 7‐year monitoring data (2012–2018) of the Ryukyu Scops Owl population on Minami‐daito Island, Japan. We used survival history data from 903 individuals, reproduction and sex ratio data from 213 broods, and count data of 2,526 individuals in total. Long‐term averages of annual survival rates were 0.73 for adult females and 0.74 for adult males, although the sexual difference was not significant. Sex ratio estimates fluctuated annually and long‐term averages were slightly skewed to males: 0.51 among fledglings, 0.54 among yearlings, and 0.52 among adults. Long‐term averages of population size were estimated to be 273.4 females and 296.8 males. The long‐term average of population growth rate was 0.98, suggesting a slightly declining trend. It was fortunate to recognize the declining trend during the early phase. Considering the general lack of fundamental ecological data on owls of tropical or subtropical areas and on islands, it seems likely that many endangered owl populations await conservation efforts.
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DOI：
--
发表时间：
2005
期刊：
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发表时间：
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期刊：
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影响因子：
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DOI：
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发表时间：
2017
期刊：
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