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No bacterial-mediated alleviation of thermal stress in a brown seaweed suggests the absence of ecological bacterial rescue effects

Soria Delva (UGent) , Bernard De Baets (UGent) , Jan Baetens (UGent) , Olivier De Clerck (UGent) and Willem Stock (UGent)
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Abstract
While microbiome alterations are increasingly proposed as a rapid mechanism to buffer organisms under changing environmental conditions, studies of these processes in the marine realm are lagging far behind their terrestrial counterparts. Here, we used a controlled laboratory experiment to examine whether the thermal tolerance of the brown seaweed Dictyota dichotoma, a common species in European coastal ecosystems, could be enhanced by the repeated addition of bacteria from its natural environment. Juvenile algae from three genotypes were subjected for two weeks to a temperature gradient, spanning almost the entire thermal range that can be tolerated by the species (11-30 degrees C). At the start of the experiment and again in the middle of the experiment, the algae were inoculated with bacteria from their natural environment or left untouched as a control. Relative growth rate was measured over the two-week period, and we assessed bacterial community composition prior to and at the end of the experiment. Since the growth of D. dichotoma over the full thermal gradient was not affected by supplementing bacteria, our results indicate no scope for bacterial-mediated stress alleviation. The minimal changes in the bacterial communities linked to bacterial addition, particularly at temperatures above the thermal optimum (22-23 degrees C), suggest the existence of a barrier to bacterial recruitment. These findings indicate that ecological bacterial rescue is unlikely to play a role in mitigating the effects of ocean warming on this brown seaweed.
Keywords
Climate change, Ocean warming, Thermal response curves, Optimal growth, Seaweed microbiome, Bacterial rescue, CLIMATE-CHANGE, MARINE, GROWTH, HABITAT, MORPHOGENESIS, DICTYOTALES, ECOSYSTEM, PATTERNS, EUROPE, IMPACT

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MLA
Delva, Soria, et al. “No Bacterial-Mediated Alleviation of Thermal Stress in a Brown Seaweed Suggests the Absence of Ecological Bacterial Rescue Effects.” SCIENCE OF THE TOTAL ENVIRONMENT, vol. 876, 2023, doi:10.1016/j.scitotenv.2023.162532.
APA
Delva, S., De Baets, B., Baetens, J., De Clerck, O., & Stock, W. (2023). No bacterial-mediated alleviation of thermal stress in a brown seaweed suggests the absence of ecological bacterial rescue effects. SCIENCE OF THE TOTAL ENVIRONMENT, 876. https://doi.org/10.1016/j.scitotenv.2023.162532
Chicago author-date
Delva, Soria, Bernard De Baets, Jan Baetens, Olivier De Clerck, and Willem Stock. 2023. “No Bacterial-Mediated Alleviation of Thermal Stress in a Brown Seaweed Suggests the Absence of Ecological Bacterial Rescue Effects.” SCIENCE OF THE TOTAL ENVIRONMENT 876. https://doi.org/10.1016/j.scitotenv.2023.162532.
Chicago author-date (all authors)
Delva, Soria, Bernard De Baets, Jan Baetens, Olivier De Clerck, and Willem Stock. 2023. “No Bacterial-Mediated Alleviation of Thermal Stress in a Brown Seaweed Suggests the Absence of Ecological Bacterial Rescue Effects.” SCIENCE OF THE TOTAL ENVIRONMENT 876. doi:10.1016/j.scitotenv.2023.162532.
Vancouver
1.
Delva S, De Baets B, Baetens J, De Clerck O, Stock W. No bacterial-mediated alleviation of thermal stress in a brown seaweed suggests the absence of ecological bacterial rescue effects. SCIENCE OF THE TOTAL ENVIRONMENT. 2023;876.
IEEE
[1]
S. Delva, B. De Baets, J. Baetens, O. De Clerck, and W. Stock, “No bacterial-mediated alleviation of thermal stress in a brown seaweed suggests the absence of ecological bacterial rescue effects,” SCIENCE OF THE TOTAL ENVIRONMENT, vol. 876, 2023.
@article{01GVZ7KSXEJZQABDKTHFEXTBX0,
  abstract     = {{While microbiome alterations are increasingly proposed as a rapid mechanism to buffer organisms under changing environmental conditions, studies of these processes in the marine realm are lagging far behind their terrestrial counterparts. Here, we used a controlled laboratory experiment to examine whether the thermal tolerance of the brown seaweed Dictyota dichotoma, a common species in European coastal ecosystems, could be enhanced by the repeated addition of bacteria from its natural environment. Juvenile algae from three genotypes were subjected for two weeks to a temperature gradient, spanning almost the entire thermal range that can be tolerated by the species (11-30 degrees C). At the start of the experiment and again in the middle of the experiment, the algae were inoculated with bacteria from their natural environment or left untouched as a control. Relative growth rate was measured over the two-week period, and we assessed bacterial community composition prior to and at the end of the experiment. Since the growth of D. dichotoma over the full thermal gradient was not affected by supplementing bacteria, our results indicate no scope for bacterial-mediated stress alleviation. The minimal changes in the bacterial communities linked to bacterial addition, particularly at temperatures above the thermal optimum (22-23 degrees C), suggest the existence of a barrier to bacterial recruitment. These findings indicate that ecological bacterial rescue is unlikely to play a role in mitigating the effects of ocean warming on this brown seaweed.}},
  articleno    = {{162532}},
  author       = {{Delva, Soria and De Baets, Bernard and Baetens, Jan and De Clerck, Olivier and Stock, Willem}},
  issn         = {{0048-9697}},
  journal      = {{SCIENCE OF THE TOTAL ENVIRONMENT}},
  keywords     = {{Climate change,Ocean warming,Thermal response curves,Optimal growth,Seaweed microbiome,Bacterial rescue,CLIMATE-CHANGE,MARINE,GROWTH,HABITAT,MORPHOGENESIS,DICTYOTALES,ECOSYSTEM,PATTERNS,EUROPE,IMPACT}},
  language     = {{eng}},
  pages        = {{10}},
  title        = {{No bacterial-mediated alleviation of thermal stress in a brown seaweed suggests the absence of ecological bacterial rescue effects}},
  url          = {{http://doi.org/10.1016/j.scitotenv.2023.162532}},
  volume       = {{876}},
  year         = {{2023}},
}

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