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首页> 外文期刊>Biological Journal of the Linnean Society >Seashore in the mountain: limestone-associated land snail fauna on the oceanic Hahajima Island (Ogasawara Islands, Western Pacific)
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Seashore in the mountain: limestone-associated land snail fauna on the oceanic Hahajima Island (Ogasawara Islands, Western Pacific)

机译：山中的海岸：海洋Hahajima岛（西太平洋小gas原群岛）上与石灰石有关的蜗牛动物群

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摘要

Because land snails inhabiting the seashore are most likely to be carried by ocean currents or by attaching to seabirds, land snail fauna on oceanic islands include species derived from the mainland ancestors inhabiting the seashore. If habitat use of the island descendants is constrained by the ecology of the mainland ancestor, the island species that moved from the coastal habitat to the inland habitat may still be restricted to relatively exposed microhabitats with high pH, calcium carbonate-rich substrates, and poor litter cover. We tested this hypothesis by investigating the association between environmental conditions and species diversity of seashore-derived species of the endemic land snails on the oceanic Hahajima Island (Ogasawara Islands). Seashore-derived species showed higher species richness on limestone outcrops than non-limestone areas, whereas the other species showed no significant increase in species richness in limestone outcrops. There was a higher proportion of seashore-derived species on the limestone ridges than on the soil of dolines, even in the limestone area. Accordingly, the species derived from the seashore of the mainland are restricted to microhabitats with poor vegetation cover, poor litter cover, high pH, and calcium carbonate-rich substrates, which supports the hypothesis that the inland species on an island derived from the mainland seashore still prefer environments similar to the seashore. In addition, the seashore-derived species on the limestone outcrop include cave-dwellers lacking functional eyes. This suggests that the probability of colonizing a cave environment is restricted to seashore-derived species. The findings obtained in the present study suggest that habitat use of the ancestral lineages can constrain habitat use of the descendants, even in the oceanic islands with depauperate fauna. This bias in the species composition on the limestone outcrop constrains lineages that can colonize and adapt to the inside of caves, and therefore, habitat use of the ancestral lineages affects the ability of descendant lineages to colonize novel habitats
机译：由于居住在海边的蜗牛最有可能是洋流或附着在海鸟上，因此，海洋岛屿上的蜗牛动物群包括源自沿海祖先的物种。如果岛屿后代的栖息地使用受到大陆祖先生态的限制，则从沿海栖息地迁移到内陆栖息地的岛屿物种可能仍被限制在相对暴露的微生境中，这些生境具有较高的pH值，富含碳酸钙的底物且贫瘠。垃圾桶盖。我们通过调查环境条件和海洋Hahajima岛（小gas原群岛）上的地方性蜗牛的海岸物种的物种多样性之间的关联来检验该假设。与石灰石露头地区相比，来自沿海的物种在石灰岩露头上的物种丰富度更高，而其他物种在石灰岩露头上的物种丰富度没有显着增加。甚至在石灰石地区，石灰岩山脊上的海岸物种比在漏斗土壤上的比例更高。因此，源自大陆海岸的物种仅限于植被覆盖差，垃圾覆盖差，pH值高和富含碳酸钙的基质的微生境，这支持以下假设：岛屿上的内陆物种源自大陆海岸仍然偏爱类似于海滨的环境。此外，石灰岩露头上的海滨物种包括缺乏功能性眼睛的洞穴居民。这表明在洞穴环境中定殖的可能性仅限于沿海物种。在本研究中获得的发现表明，祖先宗谱的栖息地利用可以限制后代的栖息地利用，即使在动物种群绝灭的海洋岛屿中也是如此。石灰岩露头上物种组成的这种偏向限制了可以定居并适应洞穴内部的世系，因此祖先世系的栖息地使用会影响其后世世系定居新的栖息地的能力。

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