Influence of thermal regime and land use on benthic invertebrate communities inhabiting headwater streams exposed to contrasted shading
Influence of thermal regime and land use on benthic invertebrate communities inhabiting headwater streams exposed to contrasted shading
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DOI：
10.1016/j.scitotenv.2014.10.077
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发表时间：
2015-02-01
影响因子：
9.8
通讯作者：
Ector, Luc
中科院分区：
文献类型：
--
作者：
Dohet, Alain;Hlubikova, Dasa;Ector, Luc
源头占流域淡水河道总长度的很大一部分，是稀有、濒危和特殊物种的重要栖息地。在气候变暖的背景下，即使在温带生态系统中，水温升高也可能对适应寒冷的物种构成最终威胁。气候变化对溪流的影响可能与污染或栖息地破碎化等其他压力相互作用，从而混淆了它们对生物群落的真正影响。在春季和秋季（2010-2012）的三年期间，对暴露于对比阴影和土地利用条件的三条源头溪流进行了采样。在每条河流的上游部分选择了沿纵向连续体分布的五个站点。除了底栖无脊椎动物采样外，还使用数据记录仪连续记录水温。结果表明，与河岸树木覆盖狭窄或缺乏的开放河道相比，整个流域内与林地利用相关的河岸林地明显调节了冬季最低温度、夏季最高温度和热变率。尽管大型无脊椎动物物种分布的变异性主要归因于流域内的人为土地利用，但很大一部分变异性可以通过温度描述符来解释，例如夏季累积度日数和冬季极端温度。喜欢源头和冷水温度的毛翅目物种仅在森林覆盖的未受影响的溪流中发现。讨论了与这些毛翅目冷适应物种未来潜在分布的预测损失相关的保护问题。 (C) 2014 Elsevier B.V. 保留所有权利。
Headwaters account for a high proportion of total freshwater stream-channel length in a drainage basin and are critical habitats for rare, endangered, and specialized species. In the context of climate warming, increasing water temperatures may be an ultimate threat to cold-adapted species even in temperate ecosystems. Climate change effects on streams may interact with other pressures such as pollution or habitat fragmentation, confounding their real impact on biological communities.Three headwater streams exposed to contrasted shading and land use conditions were sampled over a three-year period in spring and autumn (2010-2012). Five stations distributed along the longitudinal continuum were chosen in the upstream part of each stream. In addition to benthic invertebrate sampling, water temperature was recorded continuously using data loggers.Results showed that the riparian woodland associated with forested land use throughout the catchment clearly moderated winter temperature minima, summer temperature maxima and thermal variability compared to open river channels with narrow or absent riparian tree cover. Although, the variability in macroinvertebrate species distribution was mainly attributed to anthropogenic land use in the catchment, a significant part of the variability was explained by temperature descriptors such as the number of cumulative degree-days in summer and extremes in winter temperature. Trichoptera species preferring headwaters and cold water temperatures were found exclusively in the forested unimpacted stream. Conservation issues are discussed in relation to the predicted loss of the potential future distributions of these Trichoptera cold-adapted species. (C) 2014 Elsevier B.V. All rights reserved.