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Species richness of the genus Molgolaimus (Nematoda) from local to ocean scale along continental slopes

机译：大陆坡上从本地到海洋规模的Molgolaimus（Nematoda）属的物种丰富度

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摘要

This study investigated the distribution of Molgolaimus species (Nematoda) at different hierarchical spatial scales and observed the turnover of species along bathymetrical transects and among transects in two separate geographical regions. Samples from six transects (200-2000 m) from the Southern Oceans (SO) and four bathymetric transects (50-2000 m) from the Western Indian Ocean (WIO) were compared. Of the 30 species recorded, only one was common to both regions. WIO had higher local species richness than the SO. In both regions, the local scale was the greatest contributor to the total species richness. In the SO, there was no difference between species turnover at the different spatial scales, however, in the WIO, the turnover along bathymetrical transects was higher than among separated transects. For the particular genus studied, the evidence suggests that the study area in WIO has more widespread species and was better sampled, while the SO has many restricted species and it is most probably characterized by different biogeographical provinces. At the ocean scale (i.e. WIO versus SO), evolutionary histories may have strongly influenced nematodes species composition, while at local and regional scales, ecological processes are probably promoting species co-existence and specia-tion. The high co-existence of certain species at local scale is partially explained by species preference for different sediment layers.
机译：这项研究调查了不同等级空间尺度上的线虫属（线虫）物种的分布，并观察了沿测深样线和两个不同地理区域中的样线之间的物种转换。比较了来自南大洋（SO）的六个样点（200-2000 m）和来自西印度洋（WIO）的四个测深样点（50-2000 m）的样本。在记录的30个物种中，只有两个地区共有。 WIO的本地物种丰富度高于SO。在这两个地区，地方尺度是总物种丰富度的最大贡献。在SO中，不同空间尺度上物种转换之间没有差异，但是在WIO中，沿测深样线的转换比分离样线的转换要高。对于所研究的特定属，证据表明，WIO的研究区域具有更广泛的物种，并且采样效果更好，而SO则具有许多受限制的物种，并且很可能具有不同的生物地理省份。在海洋尺度（即WIO与SO），进化史可能对线虫的物种组成有很大影响，而在地方和区域尺度，生态过程可能促进了物种共存和物种形成。某些物种在局部规模上高度共存，部分原因是物种对不同沉积层的偏好。

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