globalchange  > 气候变化事实与影响
DOI: doi:10.1038/nclimate2670
Title:
Response of chinook salmon to climate change
Author: Nathan J. Mantua
Source Publication: Nature Climate Change
ISSN: 1758-853X
EISSN: 1758-6973
Publishing Year: 2015-06-24
Volume: Volume:5, Pages:Pages:613;615 (2015)
Language: 英语
Keyword: Phenology ; Evolutionary ecology ; Animal migration
English Abstract:

To the Editor —

Muñoz et al.1 present some interesting and valuable experimental data about the physiological responses of chinook salmon (Oncorhynchus tshawytscha) to changes in developmental temperature. Especially notable is the way they develop quantitative genetic data to evaluate the adaptive potential of cardiac performance to different temperature regimes. Pacific salmon clearly have the ability to develop population-specific adaptations in cardiac performance over evolutionary time scales2, but they found relatively little capacity for adaptive genetic or plastic responses in one key performance measure, the arrhythmic temperature, in the population they studied. However, we raise concerns about their extrapolation from a small study to broad conclusions about vulnerability of the entire species to climate change. They claim that “rising temperatures now threaten the persistence of [salmon]1. While it is true that many individual salmon populations and some regional population groups are at risk, threats to persistence are multifaceted and population-specific3. Moreover, the premise that persistence of the genus, or any one of the Oncorhynchus species, is now threatened by rising temperature is not supported by other empirical evidence. We are also concerned that this study ignored the documented capability of salmonids to respond to environmental change with plastic and evolutionary changes in behaviour, such as upstream (adult) and downstream (juvenile) migration timing4. Changes in phenology, rather than physiological tolerances, provide greater capacity for resilience to climate change in salmonids5 and other taxa more generally6, although the two clearly interact and the relative importance of behavioural and physiological responses may vary across taxa or contexts (such as geographic locations)7.

The Quinsam River population used in the experiment by Muñoz et al. inhabits a watershed where average water temperatures seasonally increase by about 7 °C from April to June8. Warmer temperatures are associated with more rapid development and earlier downstream migration for juvenile salmonids4. If juvenile migration advanced by a month, which is well-within the capacity for a rapid plastic response in chinook salmon, this behavioural shift would prevent exposure to 4 °C of warming in June temperature. A four-year study of juvenile migration timing in chinook salmon in Oregon's Umpqua River showed that median migration dates in two tributaries advanced 40 days when spring water temperatures were 5 °C higher9. Given that egg development is also likely to be advanced under warmer temperatures (Muñoz et al. themselves found that entry into the juvenile phase occurred 50 days earlier in their +4 °C treatment group), juvenile development in fresh water need not be cut short by earlier ocean entry. Of course, timing changes at any one life stage may pose fitness challenges in subsequent life stages, so advanced ocean migration timing might come with fitness costs10.

In addition to immediate plastic responses, evolution of reaction norms (the phenotypic response of a single genotype across a range of environments), as observed in Columbia River sockeye salmon (O. nerka) adult migration timing11, allows further modification of these traits. Taking evolution in adult migration timing into account greatly reduces the simulated probability of extinction in a population of sockeye salmon in the Fraser River, British Columbia, Canada, under climate warming scenarios10 (Fig. 1).

Related Link: http://www.nature.com/nclimate/journal/v5/n7/full/nclimate2670.html
Citation statistics:
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/4681
Appears in Collections:气候变化事实与影响
科学计划与规划
气候变化与战略

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
nclimate2670.pdf(150KB)期刊论文作者接受稿开放获取View Download

Recommended Citation:
Nathan J. Mantua. Response of chinook salmon to climate change[J]. Nature Climate Change,2015-06-24,Volume:5:Pages:613;615 (2015).
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Nathan J. Mantua]'s Articles
百度学术
Similar articles in Baidu Scholar
[Nathan J. Mantua]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Nathan J. Mantua]‘s Articles
Related Copyright Policies
Null
收藏/分享
文件名: nclimate2670.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.