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首页> 外文期刊>Journal of Avian Biology >Individual flexibility in habitat selection in the ortolan bunting Emberiza hortulana
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Individual flexibility in habitat selection in the ortolan bunting Emberiza hortulana

机译：Ortolan旗布Emberiza hortulana在生境选择方面的个体灵活性

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In order to understand habitat selection in birds, it is important to know how individuals respond when encountering a variety of habitats during dispersal and must choose between them. However, very few field studies have addressed this question. We compared habitat selection of ortolan buntings Emberiza hortulana before and after dispersal events. In Norway, this species has a patchy distribution and breeds in different open habitats of which the two major ones are botanically distinct: raised peat bogs and forest clear-cuts on dry, sandy soil. There was no evidence that habitat selection of males after natal dispersal was influenced by natal habitat, and 83% changed vegetation type. Habitat selection was random when taking the availability of each vegetation type into account, both at the landscape level and among habitats encountered along likely dispersal routes. Habitat selection after breeding dispersal was not influenced by the habitat of the patch of origin, and 62-71% changed habitat during successive dispersal events. Changing habitat did not seem to affect pairing or breeding success, but decreased with age. Lifetime patterns of habitat selection indicated that the majority (86%) changed habitat one or more times. However, the proportion never changing habitat (14%) was significantly higher than expected if settlement after dispersal was random (5%), suggesting that the majority of males were flexible whereas a minority was habitat conservative. These results provide some of the first systematic evidence based on settlement decisions of individuals that habitat selection of birds can be flexible with regard to vegetation type.
机译：为了了解鸟类的栖息地选择，了解个体在传播过程中遇到各种栖息地时的反应方式非常重要，必须在它们之间进行选择。但是，很少有现场研究解决这个问题。我们比较了散布事件发生前后Ortolan旗布Emberiza hortulana的栖息地选择。在挪威，该物种分布不规则，在不同的开放式生境中繁殖，其中两个主要的生境在植物学上是截然不同的：泥炭沼泽和在干燥，沙质土壤上的森林砍伐。没有证据表明，出生后雄性的生境选择会受到生境的影响，其中83％的植被类型发生了变化。考虑到每种植被类型的可利用性，无论是在景观层面还是在可能的传播途径中遇到的栖息地中，栖息地的选择都是随机的。繁殖扩散后的栖息地选择不受原产地栖息地的影响，并且在连续的扩散事件中62-71％的栖息地发生了变化。栖息地的变化似乎并没有影响配对或繁殖的成功，但是随着年龄的增长而下降。生境选择的终生模式表明，大多数（86％）改变了一次或多次生境。但是，如果散布后的沉降是随机的（5％），则永不改变的栖息地比例（14％）显着高于预期，这表明大多数雄性是灵活的，而少数则是保守的。这些结果提供了一些基于个体定居决定的第一批系统证据，表明鸟类的栖息地选择在植被类型方面可以灵活选择。

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