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The thermal journey of macroalgae: Four decades of temperature-induced changes in the southeastern Bay of Biscay
Arriaga, O.; Wawrzynkowski, P.; Muguerza, N.; Díez, I.; Gorostiaga, J.M.; Quintano, E.; Becerro, M.A. (2024). The thermal journey of macroalgae: Four decades of temperature-induced changes in the southeastern Bay of Biscay. Mar. Environ. Res. 195: 106351. https://dx.doi.org/10.1016/j.marenvres.2024.106351
In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, meer
Peer reviewed article  

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Trefwoorden
    ANE, Biscay Bay
    Composition > Community composition
    Global warming
    Temperature
    Bay of Biscay [Marine Regions]
    Marien/Kust
Author keywords
    Macroalgae; Subtidal; Community Temperature Index (CTI); Temporal variability; Bay of Biscay

Auteurs  Top 
  • Arriaga, O.
  • Wawrzynkowski, P.
  • Muguerza, N.
  • Díez, I.
  • Gorostiaga, J.M.
  • Quintano, E.
  • Becerro, M.A.

Abstract
    Global warming is triggering significant shifts in temperate macroalgal communities worldwide, favoring small, warm-affinity species over large canopy-forming, cold-affinity species. The Cantabrian Sea, a region acutely impacted by climate change, is also witnessing this shift. This study delved into the impacts of increasing sea surface temperature on the subtidal macroalgal communities in the southeastern Bay of Biscay over the last four decades, by using data from the years 1982, 2007, 2014, and 2020. We found that temperature has shaped the community structure, with warm-affinity species steadily displacing their cold-affinity counterparts. Notably, new communities exhibited a profusion of smaller algal species, explaining the observed increased biodiversity within the area. In the last period investigated (2014–2020), we observed a partial recovery of the communities, coinciding with cooler sea surface temperatures. Shallow algal communities were more reactive to temperature variations than deeper communities, possibly associated with higher exposure to increased temperatures. Our study offered insights into the intricate relationship between the changes in ocean temperature and algal species in the southeastern Bay of Biscay, shedding light on the ongoing ecological shifts in this region.

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