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Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate.
Miller, Cale A; Gazeau, Frédéric; Lebrun, Anaïs; Gattuso, Jean-Pierre; Alliouane, Samir; Urrutti, Pierre; Schlegel, Robert W; Comeau, Steeve.
Affiliation
  • Miller CA; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France; Department of Earth Sciences, Geosciences, Utrecht University, Utrecht, the Netherlands. Electronic address: c.a.miller@uu.nl.
  • Gazeau F; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
  • Lebrun A; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
  • Gattuso JP; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France; Institute for Sustainable Development and International Relations, Sciences Po, 27 rue Saint Guillaume, 75007 Paris, France.
  • Alliouane S; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
  • Urrutti P; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
  • Schlegel RW; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
  • Comeau S; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 181 chemin du Lazaret, 06230 Villefranche-sur-Mer, France.
Sci Total Environ ; 930: 172571, 2024 Jun 20.
Article in En | MEDLINE | ID: mdl-38663592
ABSTRACT
Arctic fjords are considered to be one of the ecosystems changing most rapidly in response to climate change. In the Svalbard archipelago, fjords are experiencing a shift in environmental conditions due to the Atlantification of Arctic waters and the retreat of sea-terminating glaciers. These environmental changes are predicted to facilitate expansion of large, brown macroalgae, into new ice-free regions. The potential resilience of macroalgal benthic communities in these fjord systems will depend on their response to combined pressures from freshening due to glacial melt, exposure to warmer waters, and increased turbidity from meltwater runoff which reduces light penetration. Current predictions, however, have a limited ability to elucidate the future impacts of multiple-drivers on macroalgal communities with respect to ecosystem function and biogeochemical cycling in Arctic fjords. To assess the impact of these combined future environmental changes on benthic productivity and resilience, we conducted a two-month mesocosm experiment exposing mixed kelp communities to three future conditions comprising increased temperature (+ 3.3 and + 5.3°C), seawater freshening by ∼ 3.0 and ∼ 5.0 units (i.e., salinity of 30 and 28, respectively), and decreased photosynthetically active radiation (PAR, - 25 and - 40 %). Exposure to these combined treatments resulted in non-significant differences in short-term productivity, and a tolerance of the photosynthetic capacity across the treatment conditions. We present the first robust estimates of mixed kelp community production in Kongsfjorden and place a median compensation irradiance of ∼12.5 mmol photons m-2 h-1 as the threshold for positive net community productivity. These results are discussed in the context of ecosystem productivity and biological tolerance of kelp communities in future Arctic fjord systems.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Climate Change / Estuaries / Kelp Country/Region as subject: Europa Language: En Journal: Sci Total Environ Year: 2024 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Climate Change / Estuaries / Kelp Country/Region as subject: Europa Language: En Journal: Sci Total Environ Year: 2024 Document type: Article