Effects of the 2003 heatwave and climatic warming on mollusc communities of the Saône: a large lowland river and of its two main tributaries (France)
Effects of the 2003 heatwave and climatic warming on mollusc communities of the Saône: a large lowland river and of its two main tributaries (France)
复制标题
2003 年热浪和气候变暖对索恩河软体动物群落的影响：一条大型低地河流及其两条主要支流（法国）
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Daufresne
中科院分区：
文献类型：
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作者：
J. Mouthon;M. Daufresne
多年来，对索恩河及其两个主要支流----杜布河和奥尼翁河----的软体动物种群动态的研究为我们提供了一个机会，突出了气候变暖，特别是2003年热浪对这些生物的影响。从1987年到2003年，里昂（库宗）上游索恩河沃茨的平均温度上升了1.5°C。此外，2003年的夏天至少是1500年以来最热的。我们使用对应分析，以确定从1996年9月至2004年12月的软体动物数据的结构变化。结果显示：（1）1996年9月至2003年7月期间，里昂上游索恩河软体动物群落结构发生了显著的渐进性变化，这可能与温度升高有关;（2）2003年7月至8月热浪期间，软体动物群落结构发生了突变，腹足类和双壳类的物种丰富度和密度显著下降。在2004年，软体动物的密度，特别是豌豆的密度仍然非常低。在索恩河沿着的其他四个地点及其两条主要支流的下游也进行了类似的观测。这表明软体动物种群的恢复力（即，它们返回到扰动前状态的速度）对热浪的影响是低的。这样，由于不同的气候模型预测，在本世纪，像2003年那样炎热的夏天的频率会增加，目前栖息在索恩河、杜布斯河和奥尼翁河以及其他大河的河流地区的软体动物物种中，有一半以上可能直接面临灭绝的威胁。
The study of the dynamics of mollusc populations of the Saône and its two main tributaries, the Doubs and Ognon, over several years has provided us with the opportunity of highlighting the consequences of climatic warming and especially of the heatwave of 2003 on these organisms. From 1987 to 2003, the mean temperature of the waters of the Saône upstream of Lyon (Couzon) increased by 1.5°C. In addition, the summer of 2003 was the hottest since 1500 at least. We used correspondence analysis to identify structure change in mollusc data dating from September 1996 to December 2004. The results revealed: (1) during the period from September 1996 to July 2003, a significant progressive change in the mollusc community structure of the Saône upstream of Lyon, probably linked to the increase of temperature; (2) from July to August 2003 during the heatwave, a sudden change in the structure of mollusc communities and a significant decrease of species richness and density of gastropods and bivalves. During 2004, mollusc density and particularly that of Pisidium remained dramatically low. Similar observations were performed at four other sites along the Saône and in the lower reaches of its two main tributaries. This suggests that the resilience of the mollusc populations (i.e., the speed with which they return to a predisturbance state) to the heatwave is low. In this way, as different climatic models have predicted an increase in the frequency of summers as hot as that of 2003 during this century, more than half the mollusc species currently inhabiting the potamic area of the Saône, Doubs and Ognon, and probably other large rivers, are probably directly threatened with extinction.