Ecological influences affecting the distribution of larval chironomid communities in the lakes on Yunnan Plateau, SW China
Ecological influences affecting the distribution of larval chironomid communities in the lakes on Yunnan Plateau, SW China
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DOI：
10.1127/1863-9135/2011/0179-0103
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
E. Zhang;P. Langdon;Hongqu Tang;Richard T. Jones;Xiangdong Yang;Ji Shen
中科院分区：
文献类型：
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作者：
E. Zhang;P. Langdon;Hongqu Tang;Richard T. Jones;Xiangdong Yang;Ji Shen
对云南高原35个湖泊的表层沉积物样品进行了调查，以探讨表层沉积物中摇蚊亚化石的分布与湖泊环境变量之间的关系。中国的这一地区是独一无二的，因为它包含了从亚热带到喜马拉雅山麓的大温度梯度，但也包含了受到人类活动严重影响的湖泊。摇蚊群落以8个类群为主，占总区系的77.7%.统计分析表明，7月平均气温和水深是影响摇蚊分布的最重要的变量。从坐标数据集的轴1中删除3个主要离群值后，温度失去了意义，但水深和底部溶解氧（DO）的减少仍然是显着的。此外，与世界各地的其他摇蚊训练集相比，该数据集的多样性较低，这表明中国该地区与世界其他地区相比，具有不同的摇蚊丰度和分布特征，因此需要在中国建立区域训练集。这是该地区的第一个亚化石摇蚊数据集，了解对当代动物群的关键环境影响将有助于解释古湖沼学数据集，以重建过去的趋势和一系列时间尺度上的环境变化幅度。
Surface sediment samples were collected from 35 lakes on the Yunnan Plateau as part of an investigation into the relationship between surface sediment subfossil chironomid distribution and lake environmental variables. This region of China is unique as it contains large temperature gradients, from the subtropics to the foothills of the Himalaya, but also contains lakes that have been heavily impacted by anthropogenic activities. The chironomid communities were dominated by 8 taxa, which together accounted for 77.7 % of the fauna. The statistical analyses indicated that mean July air temperature and water depth were the most significant variables affecting the distribution of chironomids across these sites. After removing 3 major outliers from axis 1 in the ordination data set, temperature lost its significance but water depth and reductions in bottom dissolved oxygen (DO) were still found to be significant. In addition the diversity of the dataset was found to be low compared with other chironomid training sets throughout the world, suggesting that this region in China has different characteristics governing the abundance and distribution of chironomids compared with other parts of the world, hence the need for regional training sets within China. This is the first subfossil chironomid data set from this region and the understanding of key environmental influences on contemporary faunas will aid interpretations of palaeolimnological data sets to reconstruct past trends and magnitude of environmental change over a range of timescales.