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首页> 外文期刊>Estuarine Coastal and Shelf Science >Meiobenthic communities in permanently open estuaries and open/closed coastal lagoons of Uruguay (Atlantic coast of South America)
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Meiobenthic communities in permanently open estuaries and open/closed coastal lagoons of Uruguay (Atlantic coast of South America)

机译：永久开放的河口和乌拉圭（南美大西洋沿岸）的开放/封闭沿海泻湖中的中成骨群落

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This study aimed to determine if estuarine meiofaunal communities of Uruguay (South America) vary between permanently open estuaries and open/closed coastal lagoons, or if they respond to the sediment composition. In Uruguay, estuaries and coastal lagoons vary in the degree of connectivity to the sea and in the sediment composition; sediments in estuaries are characterized by fine-medium sands but sediments vary from lagoon to lagoon (either fine-medium or coarse sand). Taxa richness (total = 16) showed less temporal variability in lagoons than in estuaries, due to patterns of presence/absence of the less abundant taxa. However, no major response to habitat was found in the most abundant groups: polychaetes (6% of total fauna) were on average 5% more abundant in lagoons than in estuaries. Some level of zonation, within estuaries and lagoons, was found in the most abundant groups, nematodes (63% of total fauna) and copepods (15%) in response to medium and fine sands. In addition, sediment type modulated seasonal patterns in the frequency of presence/absence in ostracods, polychaetes and oligochaetes. For instance, in polychaetes and ostracods the increase in the frequency of absences, occurring from summer to winter, was stronger in lagoons and estuaries dominated by fine sands. The lagoon habitat appears to ameliorate the effects of unfavourable (winter) conditions in less abundant meiofaunal taxa. In summary, sediment fractions explain spatial patterns in the average abundance of organisms (e.g. nematodes) as well as the seasonal changes in frequency of presence/absence (e.g. polychaetes). (c) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是确定乌拉圭（南美）的河口河口群落在永久开放的河口和开放/封闭的沿海泻湖之间是否有所不同，或者它们是否对沉积物成分做出反应。在乌拉圭，河口和沿海泻湖与海洋的连通程度和沉积物组成各不相同。河口的沉积物以中细砂为特征，但泻湖之间的沉积物各不相同（细砂或粗砂）。由于存在/不存在较不丰富的分类单元的模式，分类单元丰富度（总计= 16）在泻湖中的时空变异性比河口要小。但是，在最丰富的群体中没有发现对栖息地的重大反应：泻湖中的多毛cha（占总动物群的6％）平均比河口多5％。在河口和泻湖中，对中，细砂的反应最丰富的群体是线虫（线虫（占总动物群的63％）和（足类动物（15％））中的一定程度的分区。此外，沉积物类型调节了在rac类，多毛类和寡毛类中存在/不存在的频率的季节性模式。例如，在多壳类和成骨类中，从夏季到冬季，缺席频率的增加在泻湖和以细沙为主的河口中更为明显。泻湖生境似乎可以减轻在较不丰盛的平原植物类群中不利（冬季）条件的影响。总之，沉积物成分解释了生物体（例如线虫）的平均丰度以及存在/不存在的频率（例如多毛et）的季节性变化的空间格局。 （c）2015 Elsevier Ltd.保留所有权利。

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