气候变化领域集成服务门户(CCPortal): The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot

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DOI	10.1111/jpy.13434
	The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot
	James, Cody; Layton, Cayne; Hurd, Catriona L.; Britton, Damon
发表日期	2024
ISSN	0022-3646
EISSN	1529-8817
起始页码	60
结束页码	2
卷号	60 期号:2
英文摘要	Kelps are in global decline due to climate change, which includes ocean warming. To identify vulnerable species, we need to identify their tolerances to increasing temperatures and determine whether tolerances are altered by co-occurring drivers such as inorganic nutrient levels. This is particularly important for those species with restricted distributions, which may already be experiencing thermal stress. To identify thermal tolerance of the range-restricted kelp Lessonia corrugata, we conducted a laboratory experiment on juvenile sporophytes to measure performance (growth, photosynthesis) across its thermal range (4-22(degrees)C). We determined the upper thermal limit for growth and photosynthesis to be similar to 22-23(degrees)C, with a thermal optimum of similar to 16(degrees)C. To determine if elevated inorganic nitrogen availability could enhance thermal tolerance, we compared the performance of juveniles under low (4.5 mu mol center dot d(-1)) and high (90 mu mol center dot d(-1)) nitrate conditions at and above the thermal optimum (16-23.5(degrees)C). Nitrate enrichment did not enhance thermal performance at temperatures above the optimum but did lead to elevated growth rates at the thermal optimum. Our results indicate L. corrugata is likely to be extremely susceptible to moderate ocean warming and marine heatwaves. Peak sea surface temperatures during summer in eastern and northeastern Tasmania can reach up to 20-21(degrees)C, and climate projections suggest that L. corrugata's thermal limit will be regularly exceeded by 2050 as southeastern Australia is a global ocean-warming hotspot. By identifying the upper thermal limit of L. corrugata, we have taken a critical step in predicting the future of the species in a warming climate.
英文关键词	kelp; multiple drivers; nitrate; nutrients; ocean warming; thermal optimum; thermal performance curves
语种	英语
WOS研究方向	Plant Sciences ; Marine & Freshwater Biology
WOS类目	Plant Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001178697100001
来源期刊	JOURNAL OF PHYCOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290230
作者单位	University of Tasmania
推荐引用方式 GB/T 7714	James, Cody,Layton, Cayne,Hurd, Catriona L.,et al. The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot[J],2024,60(2).
APA	James, Cody,Layton, Cayne,Hurd, Catriona L.,&Britton, Damon.(2024).The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot.JOURNAL OF PHYCOLOGY,60(2).
MLA	James, Cody,et al."The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot".JOURNAL OF PHYCOLOGY 60.2(2024).