全球氣候變化和非氣候性人為擾動如何影響生物群落中動植物數量、群落結構以及生態(tài)系統(tǒng)機能已成為生態(tài)學研究的一大挑戰(zhàn),。為此,，科學家通過對河流中魚群的研究從側面對該問題進行了探討。
法國一研究小組收集了法國主要河流上7個不同研究區(qū)域內15至25年間的歷年數據,，通過定義魚種豐度,、均勻度指數等生物學變量，運用整合分析和線性回歸等方法對構建的多采樣點,、多魚種數據庫進行分析,。研究結果表明，魚類繁殖期內上游的水溫逐年上升,。繁殖期內的水溫同總豐度和暖水魚類所占比例成正比,，同均勻度成反比關系；水電和核電建設項目對氣候變化的影響沒有明顯抑制或推動作用,，說明氣候變化對生物群落的影響超過了非氣候性人為擾動的作用,。因此，研究長期生態(tài)模式時,，甚至在已受到非氣候性人為擾動的區(qū)域內，有必要將全球氣候變化系統(tǒng)地加以考慮,。
相關論文發(fā)表在《全球變化生物學》（Global Change Biology）上。（科學新聞雜志 王冰/編譯）
生物谷推薦原始出處：
（Global Change Biology）,，Volume 13 Issue 12 Page 2467-2478，MARTIN DAUFRESNE,，PHILIPPE BO?T
Climate change impacts on structure and diversity of fish communities in rivers
MARTIN DAUFRESNE and PHILIPPE BOËT
It is widely accepted that climate change constrains biota. Yet, because of the lack of consistent multisite and multitaxon surveys, few studies have addressed general rules about how climate change impacts on structure and diversity of animal communities. Especially, the relative influence of nonclimatic anthropogenic disturbances on this impact is fairly unknown. Here, we present for the first time a meta-analysis assessing the effect of global warming on stream organisms. Fish communities of large rivers in France undergoing various anthropogenic pressures showed significant increase in proportions of warm-water species and of specific richness during the last 15–25 years. Conversely, the equitability decreased, indicating a gradual decrease of the number of dominant species. Finally, the total abundance increased, coupled with rejuvenation and changes in size-structure of the communities. Interestingly, most of these effects were not depressed by the strength of nonclimatic anthropogenic disturbances. Conversely, geographical location of communities and especially closeness of natural barriers to migration could influence their response to climate change. Indeed, increase in the proportion of southern species seemed hindered at sites located close to the southern limit of the European species' geographical ranges. This work provides new evidence that climate change have deep impacts on communities which, by overtaking the effects of nonclimatic anthropogenic disturbances, could be more substantial than previously thought. Overall, our results stress the importance of considering climate change impacts in studies addressing community dynamics, even in disturbed sites.
