Phenotypic and genetic divergence among harbour porpoise populations associated with habitat regions in the North Sea and adjacent seas
Phenotypic and genetic divergence among harbour porpoise populations associated with habitat regions in the North Sea and adjacent seas
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DOI：
10.1111/j.1420-9101.2012.02461.x
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发表时间：
2012-04
影响因子：
2.1
通讯作者：
C. de Luna;S. Goodman;O. Thatcher;P. Jepson;L. Andersen;K. Tolley;A. R. Hoelzel
中科院分区：
文献类型：
--
作者：
C. de Luna;S. Goodman;O. Thatcher;P. Jepson;L. Andersen;K. Tolley;A. R. Hoelzel
确定种群结构的形成机制对于理解物种形成和生物多样性的进化至关重要。在这里，我们调查的地理范围，横切两个栖息地梯度，北海到北大西洋的过渡，和温带到亚极地地区。我们研究了港口鼠海豚（Phocoena phocoena），一个小齿鲸栖息在亚极地和温带沃茨。为了评估假定的人群之间的分化，我们测量了颅特征（N = 462个人）和变化的8个微卫星位点的338个相同的个人从挪威，英国和丹麦沃茨的形态变化。显著的形态分化反映了颊腔的大小。鼠海豚在相对较浅的沃茨觅食，主要捕食英国和丹麦沃茨的底栖物种，以及挪威沿海的中层和中层鱼类。我们认为，所观察到的分化可能是由资源专业化和适应或发展的反应，以不同的地方栖息地。
Abstract Determining the mechanisms that generate population structure is essential to the understanding of speciation and the evolution of biodiversity. Here, we investigate a geographical range that transects two habitat gradients, the North Sea to North Atlantic transition, and the temperate to subpolar regions. We studied the harbour porpoise (Phocoena phocoena), a small odontocete inhabiting both subpolar and temperate waters. To assess differentiation among putative populations, we measured morphological variation at cranial traits (N = 462 individuals) and variation at eight microsatellite loci for 338 of the same individuals from Norwegian, British and Danish waters. Significant morphological differentiation reflected the size of the buccal cavity. Porpoises forage in relatively shallow waters preying mainly on benthic species in British and Danish waters, and on mesopelagic and pelagic fish off the coast of Norway. We suggest that the observed differentiation may be explained by resource specialization and either adaptation or developmental responses to different local habitats.