Spatiotemporal distribution of free-living nematodes in glacial-fed stream reaches (Hohe Tauern, Eastern Alps, Austria)
Spatiotemporal distribution of free-living nematodes in glacial-fed stream reaches (Hohe Tauern, Eastern Alps, Austria)
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DOI：
10.1657/1523-0430(07-062
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发表时间：
2008-08-01
影响因子：
2
通讯作者：
Eisendle, Ursula
中科院分区：
文献类型：
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作者：
Eisendle, Ursula
本研究记录了冰川河流河段（奥地利阿尔卑斯山莫尔河）中自由生活线虫的时空分布，这是冰川河流研究中被广泛忽视的话题。底栖线虫的Meta-和hypokryal，在一个lotic达到内冰川形成的洪泛平原和glacio-rhithral，进行了调查，在春季，夏季和秋季2005年。总体线虫区系多样而密集，有77种，H'为2.7，平均丰度为每10 cm（2）86个个体。线虫群落参数的显着影响的网站，但不是由季节。在Kryal站点，线虫总体平均丰度从后Kryal（8 ind.每10 cm（2））到次Kryal（11 ind.每10 cm（2））略有增加，但物种数量减少（从15种减少到6种）。线虫在冰川-河道（总体平均值：每10 cm（2）49个，共52种）和河漫滩河段（总体平均值：每10 cm（2）251个，共65种）变得更加密集和多样化。4个地点的物种组成和优势种不同。存款饲养者在每个网站的主要喂养类型。最低的成熟度指数反映了最近冰川消退的Meta和hypokryal网站的苛刻的性格。
This study documents the spatiotemporal distribution of free-living nematodes in glacial-fed river reaches (Moll River, Austrian Alps), which is a widely neglected topic in glacial-fed stream research. Benthic nematodes of the meta- and hypokryal, in a lotic reach within a glacially formed floodplain and in the glacio-rhithral, were investigated in spring, summer, and autumn 2005. The overall nematofauna was diverse and dense with 77 species, H' of 2.7, and mean abundance of 86 individuals per 10 cm(2). Nematode community parameters were significantly influenced by sites, but not by seasons. At the kryal sites, nematode overall mean abundances slightly increased from the metakryal (8 ind. per 10 cm(2)) to the hypokryal (11 ind. per 10 cm(2)), but species number decreased (from 15 species to 6 species). Nematodes became more dense and diverse in both the glacio-rhithral (overall mean: 49 ind. per 10 cm(2); 52 total species) and the floodplain reach (overall mean: 251 ind. per 10 cm(2); 65 total species). Species composition and dominant species differed among the four sites. Deposit feeders represented the dominant feeding type at each site. The lowest maturity index reflected the harsh character of the recently deglacierized meta- and hypokryal sites.