Tolerant Larvae and Sensitive Juveniles: Integrating Metabolomics and Whole-Organism Responses to Define Life-Stage Specific Sensitivity to Ocean Acidification in the American Lobster

Metabolites

Kumiko Azetsu-Scott¹  Piero Calosi²  Fanny Noisette²  Mathilde Chemel²  Kayla Menu-Courey²  Sarah Piedalue²  Diana Madeira³  Dounia Daoud⁴  Helen Gurney-Smith⁵ 

[1] Bedford Institute Oceanography, Fisheries and Oceans, Dartmouth, NS B2Y 4A2, Canada;Département de Biologie, Chimie et Géographie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1, Canada;ECOMARE-Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada do Porto de Pesca Costeira, 3830-565 Gafanha da Nazaré, Portugal;Homarus Inc., 408 rue Main, Shediac, NB E4P 2G1, Canada;Saint Andrews Biological Station, Fisheries and Oceans Canada, 125 Marine Science Drive, Saint Andrews, NB E5B 0E4, Canada;

关键词: crustacean;    early life stages;    ontogeny;    pH;    pCO₂;    CCS;   

DOI  :  10.3390/metabo11090584

来源: DOAJ

【 摘 要 】

Bentho-pelagic life cycles are the dominant reproductive strategy in marine invertebrates, providing great dispersal ability, access to different resources, and the opportunity to settle in suitable habitats upon the trigger of environmental cues at key developmental moments. However, free-dispersing larvae can be highly sensitive to environmental changes. Among these, the magnitude and the occurrence of elevated carbon dioxide (CO₂) concentrations in oceanic habitats is predicted to exacerbate over the next decades, particularly in coastal areas, reaching levels beyond those historically experienced by most marine organisms. Here, we aimed to determine the sensitivity to elevated pCO₂ of successive life stages of a marine invertebrate species with a bentho-pelagic life cycle, exposed continuously during its early ontogeny, whilst providing in-depth insights on their metabolic responses. We selected, as an ideal study species, the American lobster Homarus americanus, and investigated life history traits, whole-organism physiology, and metabolomic fingerprints from larval stage I to juvenile stage V exposed to different pCO₂ levels. Current and future ocean acidification scenarios were tested, as well as extreme high pCO₂/low pH conditions that are predicted to occur in coastal benthic habitats and with leakages from underwater carbon capture storage (CCS) sites. Larvae demonstrated greater tolerance to elevated pCO₂, showing no significant changes in survival, developmental time, morphology, and mineralisation, although they underwent intense metabolomic reprogramming. Conversely, juveniles showed the inverse pattern, with a reduction in survival and an increase in development time at the highest pCO₂ levels tested, with no indication of metabolomic reprogramming. Metabolomic sensitivity to elevated pCO₂ increased until metamorphosis (between larval and juvenile stages) and decreased afterward, suggesting this transition as a metabolic keystone for marine invertebrates with complex life cycles.

【 授权许可】

Unknown