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Sharing the Space: Distribution Habitat Segregation and Delimitation of a New Sympatric Area of Subterranean Rodents

机译:共享空间:地下啮齿动物新同伴生区域的分布栖息地隔离和定界

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摘要

Subterranean rodents of the genus Ctenomys usually present an allopatric or parapatric distribution. Currently, two cases of sympatry have been recognized for the genus in the coastal dunes of southern Argentina and southern Brazil. In this context, they are ideal models to test hypotheses about the factors that delimit the patterns of space use and to understand interspecific interactions in small mammals. We investigated the vegetation structure, plant biomass and soil hardness selected by two species of subterranean rodents (Ctenomys flamarioni and C. minutus) when distributed in sympatry and allopatry from nine different areas along the line of coastal dunes in southern Brazil. In addition, our work presents a new record of a third area of sympatry for the genus Ctenomys. Ctenomys flamarioni and C. minutus show habitat segregation in the area where they occur in sympatry. These species show segregation in their selection of microhabitats, differing in relation to soil hardness, plant biomass, and plant cover. Ctenomys flamarioni showed a distinction in habitat selection when occurring in allopatry and sympatry, whereas C. minutus selected the same habitat characteristics under both conditions. A possible explanation to the observed pattern is that these species have acquired different adaptations over time which allows them the ability to exploit different resources and thus avoid competitive interactions all together.
机译:地下类的地下啮齿动物通常表现出同种或异族分布。目前,在阿根廷南部和巴西南部的沿海沙丘中,已经发现了两种共生病例。在这种情况下,它们是检验关于限制空间利用方式的因素的假设并了解小型哺乳动物中种间相互作用的理想模型。我们调查了沿着巴西南部沿海沙丘一带的九个不同区域分布在同生相和异相中的两种地下啮齿动物(Ctenomys flamarioni和C. minutus)选择的植被结构,植物生物量和土壤硬度。此外,我们的工作为宗法学提出了第三种象征法的新记录。 Ctenomys flamarioni和C. minutus在共生的地方显示栖息地隔离。这些物种在选择微生境时表现出隔离性,在土壤硬度,植物生物量和植物覆盖率方面存在差异。当发生在异源石和共生植物中时,Ctenomys flamarioni在生境选择上表现出差异,而在两种情况下,C。minutus选择相同的生境特征。对观察到的模式的一种可能的解释是,这些物种随着时间的流逝获得了不同的适应性,这使它们能够利用不同的资源,从而避免竞争性相互作用。

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