巴西东北部伯南布哥地方中心三种濒危鸟类的种群密度估计

IF 1 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Luiza Carvalho Prado, T. C. Dias, Lahert Willian Lobo-Araújo, L. Silveira, M. Francisco
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引用次数: 0

摘要

摘要确定衰落类群的相对灭绝风险对于确定保护重点和指导保护投资具有重要意义。巴西集中了地球上数量最多的濒危鸟类分类群,但其中大多数缺乏人口统计信息。本文对大西洋森林受干扰最严重的Pernambuco地方中心(PEC)特有的三种濒危鸟类进行了距离抽样种群密度估计。所分析的分类群分别是白肩蚁Thamnophilus aetiops distans(濒危)、褐翅蚁schifornis turdina intermedium(易危)和白腹蚁Hemitriccus griseipectus naumburgae(易危)。在约1000公顷的森林碎片中,估算的个体数分别为0.21、0.14和0.73。我们的发现证实了一个前提,即即使是基于栖息地特征被划分为类似威胁类别的分类群,也可能有不同的种群密度,因此,灭绝的风险也不同。尽管种群密度在不同的片段之间可能存在差异,但我们对整个PEC的数据外推证实了褐翅鸣鸟的脆弱状态,并指出了白肩蚁和白腹蚁的脆弱和最不受关注的类别,这表明对于两个较晚的分类群,当前基于其占用区域的分类(濒危和脆弱)必须占先。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Population density estimates for three endangered bird taxa from the Pernambuco Endemism Center, northeastern Brazil
Abstract Determining the relative risks of extinction of declining taxa is important to delineate conservation priorities and to guide the investments in conservation. Brazil concentrates the greatest number of endangered avian taxa on Earth, yet demographic information is lacking for most of them. Here we present distance-sampling population density estimates for three endangered bird taxa endemic to the Pernambuco Endemism Center (PEC), the most critically disturbed Atlantic Forest region. The analyzed taxa were the White-shouldered Antshrike Thamnophilus aetiops distans (Endangered), the Brown-winged Mourner Schiffornis turdina intermedia (Vulnerable), and the White-bellied Tody-tyrant Hemitriccus griseipectus naumburgae (Vulnerable). The estimated numbers of individuals/ha in an approximately 1,000 ha forest fragment were 0.21, 0.14, and 0.73, respectively. Our findings corroborated the premise that even taxa classified in similar threat categories based on habitat characteristics alone can have different population densities and consequently, divergent risks of extinction. Although population densities can vary among fragments, the extrapolation of our data to the whole PEC confirmed the Vulnerable status of the Brown-winged Mourner, and indicated the Vulnerable and Least Concern categories for the White-shouldered Antshrike and for the White-bellied Tody-tyrant, suggesting that for the two later taxa, the current classifications (Endangered and Vulnerable) based on their Areas of Occupancy must prevail.
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来源期刊
Biota Neotropica
Biota Neotropica BIODIVERSITY CONSERVATION-
CiteScore
2.90
自引率
16.70%
发文量
0
审稿时长
4-8 weeks
期刊介绍: BIOTA NEOTROPICA is an electronic, peer-reviewed journal edited by the Program BIOTA/FAPESP: The Virtual Institute of Biodiversity. This journal"s aim is to disseminate the results of original research work, associated or not to the program, concerned with characterization, conservation and sustainable use of biodiversity within the Neotropical region. Manuscripts are considered on the understanding that their content has not appeared, or will not be submitted, elsewhere in substantially the same form, because once published their copyrights are transferred to BIOTA NEOTROPICA as established in the Copyright Transfer Agreement signed by the author(s).
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