气候变化领域集成服务门户(CCPortal): Seasonal effects and trophic pressure shape the responses of species interactions in a tropical seagrass meadow to marine heatwaves

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DOI	10.1111/oik.10382
	Seasonal effects and trophic pressure shape the responses of species interactions in a tropical seagrass meadow to marine heatwaves
	Bass, Alissa V.; Falkenberg, Laura J.
发表日期	2024
ISSN	0030-1299
EISSN	1600-0706
英文摘要	Species interactions are influenced by changes to the environment, such as seasonal variations in temperature, and human-driven warming including marine heatwaves (MHWs). Alteration of species interactions, particularly those involving foundation species, can shape ecosystem structure, stability and dynamics. Marine habitats, notably seagrass meadows, are threatened by human-driven environmental changes including MHWs which have the potential to alter trophic interactions through effects on various community members including seagrasses, epiphytic algae, and epiphytic algae grazers. Here we examined the effects of a simulated marine heatwave (control versus + 4 degrees C) in different seasons and grazer occurrence on seagrass traits, epiphytic algae growth, grazer biomass and grazing rate. We found the season in which the MHW occurred affected the seagrass response and grazer influence. In winter, the MHW had positive effects on seagrass growth and nitrogen content and caused significant decreases in epiphytic algae growth. However, in summer, grazer presence increased seagrass growth and biomass, but growth was reduced by the interaction with the MHW. The season in which the MHW occurred affected the magnitude of change in leaf tissue isotopic values and C:N ratio, with greater changes occurring in summer. Epiphytic algal growth was markedly reduced by the interaction between all three factors, leading to the near lack of epiphyte growth in summer with grazers present under the MHW. Summer was also associated with a greater increase in snail biomass (most notably under MHW conditions), and increased snail grazing rate. From these results, we show that winter MHWs can drive increased growth of seagrasses but minimal impacts on grazers, while in summer increased grazer activity can interact with elevated temperatures from a MHW to increase their algal consumption. By examining responses across multiple trophic levels and distinct seasons, we achieve a more representative and realistic depiction of human-induced environmental impacts on ecosystems.
英文关键词	climate change; epiphytes; grazers; Halophila ovalis; seagrass community
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001209812900001
来源期刊	OIKOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/291069
作者单位	Chinese University of Hong Kong; University of South Australia
推荐引用方式 GB/T 7714	Bass, Alissa V.,Falkenberg, Laura J.. Seasonal effects and trophic pressure shape the responses of species interactions in a tropical seagrass meadow to marine heatwaves[J],2024.
APA	Bass, Alissa V.,&Falkenberg, Laura J..(2024).Seasonal effects and trophic pressure shape the responses of species interactions in a tropical seagrass meadow to marine heatwaves.OIKOS.
MLA	Bass, Alissa V.,et al."Seasonal effects and trophic pressure shape the responses of species interactions in a tropical seagrass meadow to marine heatwaves".OIKOS (2024).