Why do fish fail at high temperatures?

GSTDTAP

项目编号	NE/R001510/1
	Why do fish fail at high temperatures?
	Neil Benedict Metcalfe
主持机构	University of Glasgow
项目开始年	2018
	2018-02-05
项目结束日期	2021-02-04
资助机构	UK-NERC
项目类别	Research Grant
项目经费	523409(GBP)
国家	英国
语种	英语
英文摘要	There is increasing evidence that fish will be badly affected by increases in global temperatures due to their body temperatures matching that of the surrounding water. This is a particular problem for freshwater fishes since they have little scope for moving to colder water. The widely-quoted mechanistic explanation for the upper temperature limit for fish is that, as the temperature rises, there comes a point where the animal cannot supply sufficient oxygen to meet the increasing metabolic demands of its cells. However, recent tests of this hypothesis have found that it often does not correctly predict upper temperature limits, with fish failing at a temperature when their supply of oxygen is still adequate. This suggests that the currently-adopted hypothesis is inadequate. In this project we will use newly-developed methods to provide the first comprehensive test of an alternative hypothesis, and in so doing potentially provide the physiological mechanism that will underpin predictions of the consequences of warming temperatures for the distribution and functioning of fish species - and potentially other cold-blooded aquatic species. We will test whether the upper temperature limit for fish is determined by the point at which their mitochondria - the powerhouses of animal cells - fail to deliver enough of the energy molecule ATP to allow their cells to function properly. Using Brown trout as a test species we will investigate whether the changing functioning of their mitochondria allows us to predict the upper temperature at which they can still feed and grow. We will also test whether fish living at high temperatures age faster, as is predicted by this alternative hypothesis. Information from this project will allow us to predict what types of species of fish will be most vulnerable to high temperatures and which features of the temperature regime are most critical to survival (e.g. whether it is the daily average or the peak temperature). This information is needed if we are to prioritise species or sites for protection measures.
来源学科分类	Natural Environment Research
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/87030
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Neil Benedict Metcalfe.Why do fish fail at high temperatures?.2018.