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Cryptic sexual dimorphism reveals differing selection pressures on continental islands
Biotropica ( IF 1.8 ) Pub Date : 2020-10-07 , DOI: 10.1111/btp.12852
Fionn Ó Marcaigh 1 , David J. Kelly 1 , Kangkuso Analuddin 2 , Adi Karya 2 , Naomi Lawless 1 , Nicola M. Marples 1
Affiliation  

Birds are well known for their sexual dimorphism. But not all forms of dimorphism are the same, and differences in morphology can be so subtle that they are not detected by casual observation. We report that this is the case with the Sulawesi Babbler (Pellorneum celebense), the first reported instance of sexual dimorphism in this species or any of the ground babblers of the South‐East Asian islands. Our finding is based on a combination of morphometric analyses, genetic sexing, and observation of breeding condition. We highlight the utility of unsupervised clustering approaches, widely used in the biomedical literature, for the investigation of sexual dimorphism in ecological and evolutionary contexts. The sexual dimorphism was weaker on the mainland of Sulawesi and stronger on the continental islands of Kabaena, Muna, and Buton. This suggests that different evolutionary pressures have led the species to partition niches differently in these habitats, which separated only recently in geological history. This kind of intraspecific niche partitioning is an intrinsic part of the ecological niche of such species, one we must not miss if we are to fully understand these endlessly fascinating organisms and systems.

中文翻译:

隐性二态性揭示了大陆岛上不同的选择压力

鸟类因其两性异性而闻名。但是,并非所有形式的双态都是相同的,并且形态上的差异可能非常细微,以至于不能通过随意观察来发现。我们报告说,Sulawesi Babbler(Pellorneum celebense)就是这种情况。),这是该物种或东南亚诸岛的任何地面胡言乱语中第一个报道的性二态性实例。我们的发现是基于形态分析,遗传性别鉴定和繁殖条件观察相结合的结果。我们着重介绍了在生物医学文献中广泛使用的无监督聚类方法在生态和进化环境下调查性二态性的实用性。在苏拉威西岛大陆,两性异性较弱,而在卡巴埃纳,穆纳和布顿等大陆性岛屿上,两性异性较弱。这表明不同的进化压力已导致该物种在这些生境中以不同的方式划分生态位,这些生境只是在地质历史中才刚刚分离。这种种内生态位分配是这类物种生态位的固有部分,
更新日期:2020-10-07
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