Environmental factors influencing primary productivity of the forest‑forming kelp Laminaria hyperborea in the northeast Atlantic

Smale, DA; Pessarrodona, A; King, N; Burrows, MT; Yunnie, A; Vance, T; Moore, P. 2020 Environmental factors influencing primary productivity of the forest‑forming kelp Laminaria hyperborea in the northeast Atlantic. Scientific Reports, 10, 12161. https://doi.org/10.1038/s41598-020-69238-x

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Abstract/Summary

Rates and drivers of primary productivity are well understood for many terrestrial ecosystems, but remain poorly resolved for many marine ecosystems, particularly those within in coastal benthic environments. We quantified net primary productivity (NPP) using two methods as well as carbon standing stock within kelp forests (Laminaria hyperborea) at multiple subtidal habitats in the United Kingdom (UK). Study sites spanned 9° in latitude and encompassed a gradient in average temperature of ~ 2.5 °C. In addition to temperature, we measured other factors (e.g. light intensity, water motion, nutrients, sea urchin density) that may influence productivity. Although estimates of NPP were highly variable between sites, ranging from 166 to 738 g C m-2 yr-1, our study-wide average of 340 g C m-2 yr-1 indicated that L. hyperborea forests are highly productive. We observed clear differences between NPP and carbon standing stock between our cold northernmost sites and our warm southernmost sites, with NPP and standing stock being around 1.5 and 2.5 times greater in the northern sites, respectively. Ocean temperature was identified as a likely driver of productivity, with reduced NPP and standing stock observed in warmer waters. Light availability was also strongly linked with carbon accumulation and storage, with increased light levels positively correlated with NPP and standing stock. Across its geographical range, total NPP from L. hyperborea is estimated at ~ 7.61 Tg C yr-1 .This biomass production is likely to be important for local food webs, as a trophic subsidy to distant habitats and for inshore carbon cycling and (potentially) carbon sequestration. However, given the strong links with temperature, continued ocean warming in the northeast Atlantic may reduce primary productivity of this foundation species, as optimal temperatures for growth and performance are surpassed.

Item Type: Publication - Article
Additional Keywords: Biogeochemistry, climate-change ecology, Ecosystem ecology, Marine biology, Population dynamics
Subjects: Marine Sciences
Divisions: Marine Biological Association of the UK > Ecosystems and Environmental Change > Global environmental change and marine ecosystems
Depositing User: Emily Smart
Date made live: 10 Sep 2021 11:12
Last Modified: 10 Sep 2021 11:12
URI: http://plymsea.ac.uk/id/eprint/9347

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