Distribution and community structure of benthic ciliates in the North Eastern part of the Black Sea
Distribution and community structure of benthic ciliates in the North Eastern part of the Black Sea
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发表时间：
2005
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通讯作者：
A. Azovsky;Y. Mazei
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作者：
A. Azovsky;Y. Mazei
在黑海东北（高加索）海岸0 ~ 432 m的8个地点研究了自由生活的底栖毛虫的多样性和分布。3 ~ 10 m深度的非均质滨海次砂多样性最高，粗砂分选较好的裸露滨海滩涂和25 m深度以上的粉质沉积物多样性最低。在硫酸氢带（100 m以下）未发现纤毛虫。随着深度的增加，捕食性动物的种类相对多样化，而下蒸汽滤食性动物的比例下降。在物种组成的基础上，根据深度范围和沉积物性质划分出不同的群落。纤毛虫的点多样性（定义为每个样本的物种数量）主要取决于当地的栖息地条件（深度和沉积物性质），在相似的条件下，其在区域之间的变化不显著。当地多样性（在一个地点发现的物种总数）在很大程度上取决于采样努力，并可能与更大地区的多样性相当。
Summary Diversity and distribution of freeliving benthic ciliates were studied at eight localities at the northeastern (Caucasian) coast of the Black Sea, at the depths from 0 to 432 m. The highest diversity was revealed in the heterogeneous sublittoral sands at 3�10 m depths, the lowest one, at exposed littoral beaches with wellsorted coarse sands and in the silty sediments deeper than 25 m. No ciliates were found in the hydrosulphuric zone (below 100 m). With increasing depth, raptorial feeders became relatively more diverse, while the proportion of downsteam filter feeders decreased. On the basis of species composition, several communities were distinguished corresponding to depth range and sediment properties. Point diversity of ciliates (defined as number of species per sample) depends mainly on local habitat conditions (depth and sediment properties), under similar conditions its variations between regions are insignificant. Local diversity (total number of species found at a site) depends strongly on sampling effort and is potentially comparable with that of larger areas.