The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions.

摘要: The northeast Atlantic has warmed significantly since the early 1980s, leading to shifts in species distributions and changes structure functioning of communities ecosystems. This study investigated effects increased temperature on two co-existing habitat-forming kelps: Laminaria digitata, a northern boreal species, ochroleuca, southern Lusitanian shed light mechanisms underpinning responses trailing edge populations warming. Kelp sporophytes collected from southwest United Kingdom were maintained under 3 treatments: ambient (12 °C), +3 °C (15 °C) +6 (18 for 16 days. At higher temperatures, L. digitata showed decline growth rates Fv/Fm, an increase chemical defence production decrease palatability. In contrast, ochroleuca demonstrated superior photosynthesis at temperatures than current levels, was more heavily grazed. Whilst observed decreased palatability held could reduce top-down pressure marginal populations, field observations grazer densities suggest that this may be unimportant within system. Overall, our suggests will primarily driven by ecophysiological high experienced during predicted thermal maxima, although compensatory is unlikely important biogeographical context. Better understanding climate-driven range like kelps, which provide organic matter, create biogenic alter environmental conditions associated communities.