Shark critical life stage vulnerability to monthly temperature variations under climate change

TitleShark critical life stage vulnerability to monthly temperature variations under climate change
Publication TypeJournal Article
Year of Publication2024
AuthorsCoulon, N, Pilet, S, Lizé, A, Lacoue-Labarthe, T, Sturbois, A, Toussaint, A, Feunteun, E, Carpentier, A
JournalMarine Environmental Research
Volume198
Pagination106531
Date PublishedJan-06-2024
ISSN01411136
KeywordsAcidification, Ecological traits, Elasmobranch, Embryos, Global warming, Hatching success, IPCC, scenarios
Abstract

In a 10-month experimental study, we assessed the combined impact of warming and acidification on critical life stages of small-spotted catshark (Scyliorhinus canicula). Using recently developed frameworks, we disentangled individual and group responses to two climate scenarios projected for 2100 (SSP2-4.5: Middle of the road and SSP5-8.5: Fossil-fueled Development). Seasonal temperature fluctuations revealed the acute vulnerability of embryos to summer temperatures, with hatching success ranging from 82% for the control and SSP2-4.5 treatments to only 11% for the SSP5-8.5 treatment. The death of embryos was preceded by distinct individual growth trajectories between the treatments, and also revealed inter-individual variations within treatments. Embryos with the lowest hatching success had lower yolk consumption rates, and growth rates associated with a lower energy assimilation, and almost all of them failed to transition to internal gills. Within 6 months after hatching, no additional mortality was observed due to cooler temperatures.

DOI10.1016/j.marenvres.2024.106531
Catégorie HCERES
ACL - Peer-reviewed articles
Publication coopération et recherche SUD
Non