期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 219, 期 11, 页码 1705-1716出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.134528
关键词
Longfin smelt; Spirinchus thaleichthys; Delta smelt; Hypomesus transpacificus; Transcriptomics; Endangered fishes
类别
资金
- California Department of Water Resources [4600010040]
- State and Federal Contractors Water Agency [16-13-1]
- University of California Agricultural Experiment Station [2098-H, 2252-H, 2253-RR]
- Delta Science Doctoral Fellowship from Delta Stewardship Council [R/SF-56]
- Delta Science Postdoctoral Fellowship grant from Delta Stewardship Council [R/SF-60]
Climate change and associated increases in water temperatures may impact physiological performance in ectotherms and exacerbate endangered species declines. We used an integrative approach to assess the impact of elevated water temperature on two fishes of immediate conservation concern in a large estuary system, the threatened longfin smelt (Spirinchus thaleichthys) and endangered delta smelt (Hypomesus transpacificus). Abundances have reached record lows in California, USA, and these populations are at imminent risk of extirpation. California is currently impacted by a severe drought, resulting in high water temperatures, conditions that will become more common as a result of climate change. We exposed fish to environmentally relevant temperatures (14 degrees C and 20 degrees C) and used RNA sequencing to examine the transcriptome-wide responses to elevated water temperature in both species. Consistent with having a lower temperature tolerance, longfin smelt exhibited a pronounced cellular stress response, with an upregulation of heat shock proteins, after exposure to 20 degrees C that was not observed in delta smelt. We detected an increase in metabolic rate in delta smelt at 20 degrees C and increased expression of genes involved in metabolic processes and protein synthesis, patterns not observed in longfin smelt. Through examination of responses across multiple levels of biological organization, and by linking these responses to habitat distributions in the wild, we demonstrate that longfin smelt may be more susceptible than delta smelt to increases in temperatures, and they have little room to tolerate future warming in California. Understanding the species-specific physiological responses of sensitive species to environmental stressors is crucial for conservation efforts and managing aquatic systems globally.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据