气候变化领域集成服务门户(CCPortal): Impacts of sequential salinity and heat stress are recovery time-specific in freshwater crustacean, Daphnia pulicaria

CCPortal

DOI	10.1016/j.ecoenv.2023.115899
	Impacts of sequential salinity and heat stress are recovery time-specific in freshwater crustacean, Daphnia pulicaria
	Sun, Xinyu; Arnott, Shelley E.; Little, Alexander G.
发表日期	2024
ISSN	0147-6513
EISSN	1090-2414
起始页码	269
卷号	269
英文摘要	Stressors can interact to affect animal fitness, but we have limited knowledge about how temporal variation in stressors may impact their combined effect. This limits our ability to predict the outcomes of pollutants and future dynamic environmental changes. Elevated salinity in freshwater ecosystems has been observed worldwide. Meanwhile, heatwaves have become more frequent and intensified as an outcome of climate change. These two stressors can jointly affect organisms; however, their interaction has rarely been explored in the context of freshwater ecosystems. We conducted lab experiments using Daphnia pulicaria, a key species in lakes, to investigate how elevated salinity and heatwave conditions collectively affect freshwater organisms. We also monitored the impacts of various recovery times between the two stressors. Daphnia physiological conditions (metabolic rate, Na+-K+-ATPase (NKA) activity, and lipid peroxidation level) and life history traits (survival, fecundity, and growth) in response to salt stress as well as mortality in heat treatment were examined. We found that Daphnia responded to elevated salinity by upregulating NKA activity and increasing metabolic rate, causing a high lipid peroxidation level. Survival, fecundity, and growth were all negatively affected by this stressor. These impacts on physiological conditions and life history traits persisted for a few days after the end of the exposure. Heat treatments caused mortality in Daphnia, which increased with rising temperature. Results also showed that individuals that experienced salt exposure were more susceptible to subsequent heat stress, but this effect decreased with increasing recovery time between stressors. Findings from this work suggest that the legacy effects from a previous stressor can reduce individual resistance to a subsequent stressor, adding great difficulties to the prediction of outcomes of multiple stressors. Our work also demonstrates that cross-tolerance/ susceptibility and the associated mechanisms remain unclear, necessitating further investigation.
英文关键词	Freshwater; Salinization; Heatwaves; Phenotypic plasticity; Multiple stressors
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Toxicology
WOS类目	Environmental Sciences ; Toxicology
WOS记录号	WOS:001152488400001
来源期刊	ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302209
作者单位	Queens University - Canada; McMaster University
推荐引用方式 GB/T 7714	Sun, Xinyu,Arnott, Shelley E.,Little, Alexander G.. Impacts of sequential salinity and heat stress are recovery time-specific in freshwater crustacean, Daphnia pulicaria[J],2024,269.
APA	Sun, Xinyu,Arnott, Shelley E.,&Little, Alexander G..(2024).Impacts of sequential salinity and heat stress are recovery time-specific in freshwater crustacean, Daphnia pulicaria.ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY,269.
MLA	Sun, Xinyu,et al."Impacts of sequential salinity and heat stress are recovery time-specific in freshwater crustacean, Daphnia pulicaria".ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 269(2024).