Community patterns of the small riverine benthos within and between two contrasting glacier catchments.
Community patterns of the small riverine benthos within and between two contrasting glacier catchments.
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DOI：
10.1002/ece3.679
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发表时间：
2013-09
影响因子：
2.6
通讯作者：
Traunspurger, Walter
中科院分区：
文献类型：
--
作者：
Eisendle-Floeckner, Ursula;Jersabek, Christian D.;Kirchmair, Martin;Hashold, Kerstin;Traunspurger, Walter
关键词：
持续的冰川退缩预计将导致冰川河流的许多变化。本研究记录了冰川河流中迄今为止被广泛忽视的微型和小型底栖生物（MMB：细菌，真菌，藻类，原生生物和小型底栖生物）的群落组成的发展，以响应不同的栖息地条件驱动的（去）冰川化的不同阶段。我们的模型基于奥地利阿尔卑斯山的Möll河（MC）和Kleinelendbach流（KC）的冰川集水区，自1998年以来，冰川化和冰川退缩分别为60%和25%，分别为403和26米。对整个流域多样性和相似性模式的分析表明，无论是强烈的冰川化还是快速的冰川消融都不是MMB的主要决定因素。这归因于MC的特定环境条件，快速退缩的Pasterze冰川形成了一个严酷的不稳定的冰前区，但也是一个良性的洪泛区，前者抑制，后者支持MMB的结构发展。相似年龄的河流栖息地的MC proglacial和KC主通道的比较进一步证明了MMB（64个类群）的快速退缩MC冰川的发展抑制，不像在KC（130个类群）的温和的冰川退缩。生境条件与融化期的相互作用解释了MMB相似模式的差异，这本身就不同地反映了不同冰川活动所施加的时空生境设置。不同的冰川影响表示的冰川指数（GIm）的基础上的水温，电导率和河床稳定性。线虫，轮虫，藻类和硅藻的分类丰富度是明显相关的这个指数，因为最MMB丰度。然而，最强的关系到GIM的线虫丰度和成熟度。我们的观测结果突出了MMB对正在进行的冰川退缩的强烈反应，以及揭示这种模式的简单指数的实用性。
Ongoing glacial retreat is expected to lead to numerous changes in glacier-fed rivers. This study documents the development of community composition of the hitherto widely neglected micro- and meiobenthos (MMB: bacteria, fungi, algae, protists, and meiofauna) in glacier rivers in response to the distinct habitat conditions driven by different stages of (de)glacierization. Our model is based on the glacier catchments of the Möll River (MC) and Kleinelendbach stream (KC), in the Austrian Alps, with 60% and 25% glacierization and glacier retreats of 403 and 26 m, respectively, since 1998. Analyses of overall catchment diversity and resemblance patterns showed that neither intense glacierization nor rapid deglacierization were predominant MMB determinants. This was ascribed to the specific environmental conditions at the MC, where the rapidly retreating Pasterze glacier has formed a harsh unstable proglacial, but also a benign floodplain area, with the former suppressing and the latter supporting the structural development of the MMB. Comparisons of similarly aged riverine habitats of the MC proglacial and the KC main channel further evidenced developmental suppression of the MMB (64 taxa) by the rapidly retreating MC glacier, unlike the moderate glacial retreat in the KC (130 taxa). Habitat conditions interacting with melt periods explained the differences in MMB resemblance patterns, which themselves differentially reflected the spatiotemporal habitat settings imposed by the different glacier activities. The varying glacial influences were represented by a glaciality index (GIm) based on water temperature, electrical conductivity, and stream bed stability. The taxonomic richness of nematodes, rotifers, algae, and diatoms was distinctly related to this index, as were most MMB abundances. However, the strongest relationships to the GIm were those of nematode abundances and maturity. Our observations highlight the intense response of the MMB to ongoing glacier retreat and the utility of a simple index to reveal such patterns.
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影响因子：
3.4
作者：
Dyurgerov, Mark;Meier, Mark F.;Bahr, David B.
通讯作者：
Bahr, David B.
影响因子：
1.9
作者：
Fuereder, Leopold
通讯作者：
Fuereder, Leopold
影响因子：
2
作者：
Eisendle, Ursula
通讯作者：
Eisendle, Ursula
影响因子：
1.2
作者：
Eisendle, Ursula
通讯作者：
Eisendle, Ursula
影响因子：
2.7
作者：
Ilg, C;Castella, E
通讯作者：
Castella, E