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首页> 外文期刊>Aquatic Ecology >Life at the extreme: meiofauna from three unexplored lakes in the caldera of the Cerro Azul volcano, Galápagos Islands, Ecuador
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Life at the extreme: meiofauna from three unexplored lakes in the caldera of the Cerro Azul volcano, Galápagos Islands, Ecuador

机译：极端生活：厄瓜多尔加拉帕戈斯群岛的塞罗·阿祖尔火山火山口的三个未开发湖泊中的鱼类

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摘要

On Isla Isabela, Galápagos Archipelago, three so far unexplored lakes were investigated in the caldera of Cerro Azul, one of the most active volcanoes in the world. The lakes face recurrent desiccation and eruption events and showed distinct differences in their water chemistry. Thirty cores from the upper 15 cm of sediment indicate distinct differences in the composition of meiobenthic communities between the lakes. In total, 27 different aquatic metazoan species could be distinguished. Numerically, rotifers dominated in two of the lakes, with mean densities up to 4.56 × 106 individuals m?2 while the third lake was dominated by a gastrotrich of the genus Chaetonotus (0.67 × 106 individuals m?2). The largest lake harboured up to 14.4 × 106 nematodes m?2, which is the highest nematode density thus far reported for a freshwater habitat. The lakes yielded few nematode species (S = 7, N = 887) and calculation of the Shannon–Wiener index (H′) indicated an exceptionally low nematode diversity. The nematode community of one lake was clearly dominated by an undescribed suction-feeding Mesodorylaimus (59.6%), the community of the other lake by the epistrate feeder Achromadora pseudomicoletzkyi (89.3%), whereas the third lake surprisingly contained no nematodes. The benthic nematode biomasses for the two nematode-containing lakes differed by a factor 50. The food webs of the three lakes are presumed to have an exceptionable simply structure.
机译：在加拉帕戈斯群岛的Isla Isabela上，对世界上最活跃的火山之一塞罗·阿祖尔火山口的三个迄今尚未开发的湖泊进行了调查。湖泊面临经常性的干燥和喷发事件，其水化学性质表现出明显差异。沉积物上部15 cm处的30个岩心表明湖泊之间中底栖动物群落的组成存在明显差异。总共可以区分27种不同的水生后生动物物种。从数量上讲，轮虫在两个湖泊中占主导地位，平均密度高达4.56×106 个个体m？2 ，而第三个湖泊则由Chaetonotus属的胃食虫占主导地位（0.67×106 >个人m？2 ）。最大的湖泊拥有高达14.4×106 线虫m？2 ，这是迄今为止报道的淡水生境中最高的线虫密度。湖泊中的线虫种类很少（S = 7，N = 887），香农-维纳指数（H'）的计算表明线虫的多样性极低。一个湖泊的线虫群落明显地由未描述的吸食性中生香食草（59.6％）占主导地位，另一个湖泊的the虫饲养者假色线虫（Achromadora pseudomicoletzkyi）占89.3％，而第三个湖泊令人惊讶地没有线虫。两个含有线虫的湖泊的底栖线虫生物量相差50倍。假定这三个湖泊的食物网具有异常简单的结构。

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