This research investigates the influence of environmental parameters that are known to affect bdelloid rotifer species richness and composition in temperate zones on the genus Rotaria in tropical zone. Our study analysed species richness and composition of the genus Rotaria from 390 samples collected from several types of aquatic habitats in Thailand. Coordinates, elevation, limnological parameters such as water temperature, conductivity, total dissolved solids, salinity, dissolved oxygen and pH were measured. A total of nine species was recorded. Of these, one species, Rotaria macrura (Ehrenberg, 1832), was a new record for Thailand and new to the oriental region, and was a yet undescribed species, Rotaria sp. The species diversity of this genus increased from eight to 10 species. The presence or absence of the genus Rotaria was significantly influenced by dissolved oxygen and habitat type. For the samples where the genus occurred, species richness was not affected by any of the limnological or bioclimatic variables. Differences in species composition were affected only by habitat type. The results support former suggestions that common abiotic parameters do not seem to strongly influence diversity in bdelloids, whereas major ecological differences between habitats influence bdelloid occurrence.

中文翻译：

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环境变量对泰国轮状轮虫属贝氏轮虫的影响

本研究调查了已知影响温带轮虫物种丰富度和组成的环境参数对该属的影响扶轮社在热带地区。我们的研究分析了该属的物种丰富度和组成扶轮社来自泰国几种类型的水生栖息地收集的 390 个样本。测量坐标、海拔、湖沼学参数，如水温、电导率、总溶解固体、盐度、溶解氧和 pH 值。共记录了九种。其中，一种，大圆轮(Ehrenberg, 1832)，是泰国的新记录，也是东方地区的新记录，是一个尚未描述的物种，扶轮社sp。该属的物种多样性从8种增加到10种。属的存在与否扶轮社受溶解氧和栖息地类型的显着影响。对于出现该属的样品，物种丰富度不受任何湖泊或生物气候变量的影响。物种组成的差异仅受栖息地类型的影响。结果支持以前的建议，即常见的非生物参数似乎不会强烈影响贝类的多样性，而栖息地之间的主要生态差异会影响贝类的发生。