法國(guó)農(nóng)業(yè)和環(huán)境工程研究所研究人員的最新研究發(fā)現(xiàn)，受全球氣候變暖影響,，歐洲水域中魚(yú)類(lèi)的“塊頭”在幾十年間縮小了一半,。
該機(jī)構(gòu)研究人員在美國(guó)《國(guó)家科學(xué)院學(xué)報(bào)》上發(fā)表報(bào)告說(shuō)，過(guò)去二三十年間,，歐洲水域里各種魚(yú)類(lèi)的體積平均縮小了50％,，小巧魚(yú)類(lèi)所占比例正在逐漸升高。
研究人員說(shuō),，水溫升高對(duì)魚(yú)群的遷徙和繁衍都會(huì)產(chǎn)生影響,。通常情況下，在溫度較高水域里生活的魚(yú)類(lèi)體積較小,。
研究負(fù)責(zé)人之一馬丁·多弗雷納說(shuō),，雖然過(guò)度捕撈可導(dǎo)致魚(yú)類(lèi)個(gè)頭變小，但這絕不是唯一原因,，他們的研究結(jié)果表明,，氣候變暖也是原因之一。
多弗雷納特別提醒說(shuō),，魚(yú)類(lèi)體積變小會(huì)對(duì)生態(tài)環(huán)境產(chǎn)生嚴(yán)重影響,，如體積變小將使魚(yú)類(lèi)的產(chǎn)卵量下降，從而打破食物鏈和生態(tài)系統(tǒng)的平衡,。（生物谷Bioon.com）
生物谷推薦原始出處：
PNAS doi: 10.1073/pnas.0902080106
Global warming benefits the small in aquatic ecosystems
Martin Daufresnea,b,1, Kathrin Lengfellnera and Ulrich Sommera
aFB3–Marine ?kologie, Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), 24105 Kiel, Germany; and
bHYAX–Lake Ecosystems Laboratory, Cemagref, 13182 Aix-en-Provence, France
Understanding the ecological impacts of climate change is a crucial challenge of the twenty-first century. There is a clear lack of general rules regarding the impacts of global warming on biota. Here, we present a metaanalysis of the effect of climate change on body size of ectothermic aquatic organisms (bacteria, phyto- and zooplankton, and fish) from the community to the individual level. Using long-term surveys, experimental data and published results, we show a significant increase in the proportion of small-sized species and young age classes and a decrease in size-at-age. These results are in accordance with the ecological rules dealing with the temperature–size relationships (i.e., Bergmann's rule, James' rule and Temperature–Size Rule). Our study provides evidence that reduced body size is the third universal ecological response to global warming in aquatic systems besides the shift of species ranges toward higher altitudes and latitudes and the seasonal shifts in life cycle events.
