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No place like home? A test of the natal habitat-biased dispersal hypothesis in Scandinavian wolves

机译:没有像家一样的地方?斯堪的纳维亚狼的出生地偏向性传播假设检验

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摘要

Natal dispersal is an important mechanism for the viability of populations. The influence of local conditions or experience gained in the natal habitat could improve fitness if dispersing individuals settle in an area with similar habitat characteristics. This process, defined as ‘natal habitat-biased dispersal’ (NHBD), has been used to explain distribution patterns in large carnivores, but actual studies evaluating it are rare. We tested whether grey wolf Canis lupus territory establishment was influenced by the habitat characteristics of the natal territory using the long-term monitoring of the Scandinavian wolf population. We paired the locations of natal and established territories, accounted for available habitats along the dispersing route, and compared their habitat characteristics for 271 wolves during 1998–2012. Wolves with the shortest dispersal distances established in natal-like habitat types more than expected by chance, whereas wolves that dispersed longer distances did not show NHBD. The pattern was consistent for male and female wolves, with females showing more NHBD than males. Chances to detect NHBD increased with the size of habitat defined as available. This highlights the importance of considering the biological characteristics of the studied species when defining habitat availability. Our methodological approach can prove useful to inform conservation and management to identify habitats to be selected by reintroduced or naturally expanding populations.
机译:纳塔尔扩散是人口生存能力的重要机制。如果散居的人定居在具有相似栖息地特征的区域中,则当地条件或在原始栖息地中获得的经验的影响可以改善健康状况。这个过程被定义为“出生地偏向传播”(NHBD),已被用来解释大型食肉动物的分布模式,但实际的评估工作很少。我们通过对斯堪的纳维亚狼种群的长期监测,测试了灰太狼犬天狼星的领土建立是否受到出生地栖息地特征的影响。我们将出生地和既定领地的位置配对,考虑了分散路线上的可用栖息地,并比较了1998-2012年间271头狼的栖息地特征。在像新生代的栖息地类型中建立的最短传播距离的狼比偶然所期望的要多,而更远距离传播的狼则没有NHBD。雄性和雌性狼的分布规律是一致的,雌性显示的NHBD高于雄性。 NHBD的检出机会随栖息地规模的增加而增加。这突出说明了在定义栖息地可用性时考虑所研究物种的生物学特性的重要性。我们的方法论方法可被证明有助于保护和管理,以识别将被重新引入或自然扩展的种群选择的栖息地。

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