Bluethroats Luscinia svecica namnetum offset landscape constraints by expanding their home range
Bluethroats Luscinia svecica namnetum offset landscape constraints by expanding their home range
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DOI：
10.1007/s10336-015-1172-y
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发表时间：
2015-02
影响因子：
1.3
通讯作者：
L. Godet;Matthieu Marquet;M. Eybert;E. Grégoire;S. Monnet;J. Fournier
中科院分区：
文献类型：
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作者：
L. Godet;Matthieu Marquet;M. Eybert;E. Grégoire;S. Monnet;J. Fournier
众所周知，沿海盐碱地高度分散的景观结构会导致陆地鸟类数量、物种丰富度和多样性减少，但会促进以专门物种为主的原始群落，如蓝喉草Luscinia svecica namnetum。本种主要发现于这些盐碱地的核心，那里的景观特征先验地对陆生鸟类最具敌意。这项研究的目的是测试像蓝眉燕这样的特殊物种的个体是否可以通过扩大它们的家园范围来抵消这种景观限制。因此，我们在2013年和2014年在Marais du Mès（法国西部的Parc Naturel Régional de Brière）的盐沼中无线电跟踪了21名男性。18个最好的监测男性的数据被用来进行方差的层次划分，以测试景观特征，个人特征和距离其他男性对他们的家域大小的相对影响。我们发现，景观特征的因素，最好的解释家庭范围的大小。家域的大小显着较小的潮沟和盐沼补丁组成的多样化景观，往往是较大的景观为主的水生基质组成的池塘。这项研究的结果表明，虽然少数鸟类能够选择先验的敌对景观，他们可以通过扩大自己的家园范围的大小来抵消这种限制。
The highly fragmented landscape structures of coastal salinas are known to result in decreased terrestrial bird abundance, species richness and diversity but to promote original assemblages dominated by specialist species, such as the BluethroatLuscinia svecica namnetum. This species is mainly found at the core of these salinas, where the landscape characteristics are a priori the most hostile for terrestrial birds. The aim of this study was to test whether individuals of a specialized species like the Bluethroat may offset such landscape constraints by expanding their home ranges. We therefore radio-tracked 21 males in 2013 and 2014 in the salinas of the Marais du Mès (Parc Naturel Régional de Brière, Western France). The data of the 18 best-monitored males were used to carry out a hierarchical partitioning of variance to test the relative influence of landscape characteristics, individual characteristics and distance to other males on their home-range sizes. We found that landscape characteristics were the factors that best explained home range sizes. Home-range sizes were significantly smaller in diversified landscapes composed of tidal creeks and salt-marsh patches and tended to be larger in landscapes dominated by the aquatic matrix consisting of water ponds. The results of this study demonstrate that although a few bird species are able to select a priori hostile landscapes, they can offset such constraints by expanding their home-range size.