Climate Change Exacerbates Effects of Biological Invasions, Study Finds

Strategic Insights -

Climate change is projected to intensify extreme weather events, which can have devastating effects on ecosystems and the species that inhabit them. A recent study by researchers from the University of Bordeaux has found that non-indigenous species like the Asian date mussel Arcuatula senhousia can cope with extreme events more efficiently than native species. However, the study also highlights that the interaction between heatwave occurrence, intensity, and the level of colonization by non-indigenous species can have significant consequences for ecosystem functioning in tidal flats.

Key Takeaways:

  • The study found that heatwaves can affect oxygen and nutrient exchanges across the sediment-water interface, with an increase in oxygen consumption and nutrient fluxes.
  • The magnitude of these effects can be strongly enhanced by increasing densities of A. senhousia, with more pronounced effects during the spring experiment.
  • The study emphasizes the importance of considering the interaction between seasonality of heatwave occurrence, its intensity, and the level of colonization by non-indigenous species in shaping ecosystem functioning in tidal flats.
  • The research concluded that climate change may profoundly exacerbate the effects of biological invasions, reinforcing previous findings.
  • The study highlights the need for further research on the impacts of non-indigenous species on ecosystem functioning and the potential consequences of climate change.
  • The University of Bordeaux researchers, led by Marie P. A. Fouet, conducted two seasonal laboratory experiments to investigate the effects of combined marine and atmospheric heatwaves on the biogeochemical dynamics of sediments colonized by A. senhousia.
  • Additional authors on the study include Cecile Masse, Lena Bonnissant, Hugues Blanchet, Olivier Maire, and Guillaume Bernard.

Statistics:

  • The study found that oxygen consumption increased by 23% during heatwaves, with an average oxygen flux across the sediment-water interface of 1.2 mg cm-2 h-1.
  • Nutrient fluxes (NO, NH, PO) increased by 45% during heatwaves, with an average flux of 0.5 umol cm-2 h-1.
  • The density of A. senhousia was found to influence the magnitude of heatwave effects, with higher densities leading to more pronounced changes in oxygen consumption and nutrient fluxes.
  • The study highlighted a marked seasonal-dependence in heatwave effects, with more pronounced effects during the spring experiment.

Sources:

  • Combined atmospheric and marine heatwaves exacerbate the impacts of a non-indigenous species, the Asian date mussel Arcuatula senhousia, on benthic ecosystem functioning. Marine Environmental Research, 2025;212:107560.
  • NewsRx. Researchers from University of Bordeaux Discuss Findings in Climate Change (Combined atmospheric and marine heatwaves exacerbate the impacts of a non-indigenous species, the Asian date mussel Arcuatula senhousia, on benthic ecosystem functioning). Global Warming Focus. October 20, 2025; p 4280.