To better understand the sessile rotifer community of a shallow, eutrophic lake, we monitored over a 1‐year period the monthly changes in the density and diversity of rotifers on the roots of the common water hyacinth, Eichhornia crassipes, which served as a representative hydrophyte. Selected physical and chemical parameters of the water were also determined. Mean annual density of all sessile species was 630 individuals per ml. Species of Collothecacea (n = 7) were most abundant. Of the 12 species of Flosculariaceae (Flosculariidae), Sinantherina socialis occurred seasonally, while Ptygura beauchampi was most common across all seasons. The Shannon–Wiener diversity index was highest (H′ = 2.8) in April, but decreased in January (H′ = 1.3). Applying the concept of the guild ratio (functional‐based analysis) we found that raptorial species (Collothecacea) were dominant over most of the year (June–February), while microphagous Flosculariidae were dominant during the warm, drier season (March–May). BEST (optimal matching of biota to environment, including stepwise search) analysis and canonical correspondence revealed that temperature, dissolved oxygen, pH, turbidity, and transparency strongly influenced sessile rotifer dynamics. We also found significant correlations between the density of some species and physicochemical variables. These species included Collotheca ambigua, C. coronetta, C. ornata, C. campanulata, C. tenuilobata, and Stephanoceros millsii in the Collothecacea; and Beauchampia crucigere, Limnias melicerta, L. ceratophylli, Ptygura crystallina, P. melicerta, and Sinantherina ariprepes in the Flosculariidae. Our study shows that the communities of sessile rotifers were structured by abiotic factors and that the guild ratio is useful for understanding the relationship between sessile rotifers and their substrata.

中文翻译：

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无齿轮虫（Rotifera）在墨西哥一个浅水，富营养的拉姆萨尔湿地表现出强烈的季节性

为了更好地了解浅水富营养化湖泊的无柄轮虫群落，我们在1年的时间内监测了常见水葫芦凤眼莲（Eichhornia crassipes）根上轮虫密度和多样性的每月变化，该凤眼莲是代表性的水生植物。 。还确定了水的选定物理和化学参数。所有无柄物种的年平均密度为每毫升630个个体。Collececacea种类（n  = 7）最丰富。在12种大黄藻科中，西奈那利纳种是季节性发生的，而Ptygura beauchampi在所有季节中最常见。香农-维纳多样性指数最高（H ′ = 4月为2.8），但1月为降低（H '  = 1.3）。应用行会比率（基于功能的分析）的概念，我们发现猛禽物种（Collothecacea）在一年中的大部分时间（六月至二月）占主导地位，而微食性小球藻在温暖，干燥的季节（三月至五月）占主导地位。 。BEST（生物群与环境的最佳匹配，包括逐步搜索）分析和规范对应关系表明，温度，溶解氧，pH，浊度和透明度强烈影响无柄轮虫的动力学。我们还发现某些物种的密度与理化变量之间存在显着的相关性。这些品种包括Collotheca ambigua，C. coronetta，C.姬蛙，Collothecacea中的C. campanulata，C。tenuilobata和Stephanoceros millsii；和Beauchampia crucigere，Limnias melicerta，L. ceratophylli，Ptygura crystallina，P. melicerta和Sinantherina ariprepes在Flosculariidae。我们的研究表明，无柄轮虫的群落是由非生物因素构成的，行会比率对于了解无柄轮虫与其下层之间的关系非常有用。