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首页> 外文期刊>Hydrobiologia >Variation in benthic invertebrate abundance along thermal gradients within headwater streams of a temperate basin in Japan
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Variation in benthic invertebrate abundance along thermal gradients within headwater streams of a temperate basin in Japan

机译：日本温带盆地上游水域底栖无脊椎动物的含量随温度梯度的变化

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摘要

To better understand the impacts of water temperature variation on stream invertebrates, we sampled benthic assemblages and measured water temperature monthly in headwater streams located in northeast Japan during 2011 and 2012. The sites in headwater streams had similar hydraulic and topographical settings, were free of man-made structures, and ranged in elevation from 100 to 850 m above sea level. The results of month-by-month analysis on the relationship between temperature and Plecoptera density revealed that the abundance declined with highly elevated temperatures in mid-summer (July, August). The strongest relationship between variation in Plecoptera abundance (June to October in 2012), however, and water temperature occurred during early summer (June). Thus, early summer temperatures contribute to greater seasonal increase in abundance, suggesting that snapshot data may be unreliable for detecting consistent relationships between the abundance and temperature. The degree of similarity in benthic fauna between sites was significantly negatively correlated with differences in water temperature but not correlated with geographical distance. These results suggest that faunal composition varies along the water temperature gradient rather than habitat connectivity in temperate headwater streams.
机译：为了更好地了解水温变化对河流无脊椎动物的影响，我们在2011年至2012年期间对位于日本东北部的上游水流进行了底栖组合采样并每月测量水温。上游水流的站点具有相似的水力和地形环境，没有人为人造结构，海拔范围从海拔100到850 m。对温度与鞘翅目密度之间关系的逐月分析结果表明，随着仲夏（7月，8月）温度的升高，丰度下降。但是，鞘翅目丰度变化（2012年6月至10月）与水温之间的关系最强，发生在初夏（6月）。因此，初夏的温度有助于丰度在更大的季节增加，这表明快照数据对于检测丰度和温度之间的一致关系可能不可靠。地点之间底栖动物群的相似程度与水温差异显着负相关，但与地理距离无关。这些结果表明，动物群的组成沿水温梯度变化，而不是在温带源头水流中的栖息地连通性。

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