Distribution of benthic microcrustaceans along a water depth gradient in an Austrian Alpine lake - Sedimentary evidence for niche separation
Distribution of benthic microcrustaceans along a water depth gradient in an Austrian Alpine lake - Sedimentary evidence for niche separation
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DOI：
10.1016/j.limno.2011.08.003
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发表时间：
2012-02-01
期刊：
影响因子：
1.7
通讯作者：
Nevalainen, Liisa
中科院分区：
文献类型：
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作者：
Nevalainen, Liisa
利用奥地利阿尔卑斯山Niedere Tauern一个高温湖泊中的表层化石组合，用古矿物学方法研究了底栖微型甲壳动物(甲壳纲：枝角类)的分布。20个表层沉积物样品的研究结果表明，沿水深梯度(1.8-6.1m)，脊椎动物的空间分布具有明显的非均质性，浅水(温暖、成矿)生境以四角藻为主，中等深度以球藻占优势，深水(冷、有机)生境以近缘海鞘为主。显然，这些海底枝角类显示出明显的栖息地和资源隔离。分布格局揭示了大约2.5米和4.5米水深的当地群落阈值，这些阈值可能受到栖息地质量(矿质-有机)、食物资源(围生/碎屑)、热性质(暖-冷)和紫外线暴露(高-低)的差异的影响。这些结果强调了古动物学方法在分布调查中的可用性，以及它在为环境变化评估和古生态解释提供物种-环境关系信息方面的适用性。(C)2011年爱思唯尔股份有限公司。版权所有。
Distribution of benthic microcrustacean (Crustacea: Cladocera) was investigated with paleolimnological approach by using their fossil surface sediment assemblages within a thermally extreme lake in the Niedere Tauern, Austrian Alps. The results from 20 surface sediment samples suggested that the spatial distribution of chydorids is clearly heterogeneous along the water depth gradient (1.8-6.1 m); Alona quadrangularis dominated in shallow (warm, minerogenic) habitats, Chydorus sphaericus-type succeeded at intermediate depths, and Alona affinis dominated in deep (cold, organic) sites. Apparently, these benthic cladocerans exhibit clear habitat and resource segregation. The distributional patterns revealed local community thresholds at approximately 2.5 and 4.5 m water depths and these thresholds were likely to be forced by variances in habitat quality (minerogenic-organic), food resources (periphyton/detritus), thermal properties (warm-cold), and UV-exposure (high-low). The results emphasize the usability of the paleolimnological approach in distributional investigations and its applicability in providing information on species-environmental relationships for environmental change evaluations and paleoecological interpretations. (C) 2011 Elsevier GmbH. All rights reserved.