法国农业和环境工程研究所研究人员的最新研究发现，受全球气候变暖影响，欧洲水域中鱼类的“块头”在几十年间缩小了一半。
该机构研究人员在美国《国家科学院学报》上发表报告说，过去二三十年间，欧洲水域里各种鱼类的体积平均缩小了50％，小巧鱼类所占比例正在逐渐升高。
研究人员说，水温升高对鱼群的迁徙和繁衍都会产生影响。通常情况下，在温度较高水域里生活的鱼类体积较小。
研究负责人之一马丁·多弗雷纳说，虽然过度捕捞可导致鱼类个头变小，但这绝不是唯一原因，他们的研究结果表明，气候变暖也是原因之一。
多弗雷纳特别提醒说，鱼类体积变小会对生态环境产生严重影响，如体积变小将使鱼类的产卵量下降，从而打破食物链和生态系统的平衡。（生物谷Bioon.com）
生物谷推荐原始出处：
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.
