期刊
MARINE ENVIRONMENTAL RESEARCH
卷 173, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2021.105529
关键词
Laminaria; Ecosystem change; Benthic processes; Carbon cycling; Detritus
资金
- UKRI Future Leaders Fellowship [MR/S032827/1]
This study found that the degradation rate of detrital material is influenced by light availability and temperature. Overall, degradation rates were faster under lower light conditions and at higher temperatures, although responses varied between plants and fragments.
Kelp detritus fuels coastal food webs and may play an important role as a source of organic matter for natural carbon sequestration. Here, we conducted ex situ and in situ manipulations to evaluate the role of temperature and light availability in the breakdown of detrital material. We examined degradation rates of two North Atlantic species with contrasting thermal affinities: the 'warm water' kelp Laminaria ochroleuca and the 'cool water' Laminaria hyperborea. Detrital fragments were exposed to different temperatures in controlled conditions and across an in situ gradient of depth, corresponding to light availability. Overall, degradation rates (i.e. changes in Fv/Fm and biomass) were faster under lower light conditions and at higher temperatures, although responses were highly variable between plants and fragments. Crucially, as L. ochroleuca degraded faster than L. hyperborea under some conditions, a climate-driven substitution of the 'cool' for the 'warm' kelp, which has been observed at some locations, will likely increase detritus turnover rates and alter detrital pathways in certain environments. More importantly, ocean warming combined with decreased coastal water quality will likely accelerate kelp detritus decomposition, with potential implications for coastal food webs and carbon cycles.
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