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Northeast Atlantic elasmobranch community on the move: Functional reorganization in response to climate change
Coulon, N.; Elliott, S.; Teichert, N.; Auber, A.; McLean, M.; Barreau, T.; Feunteun, E.; Carpentier, A. (2024). Northeast Atlantic elasmobranch community on the move: Functional reorganization in response to climate change. Glob. Chang. Biol. 30(1): e17157. https://dx.doi.org/10.1111/gcb.17157
In: Global Change Biology. Blackwell Publishers: Oxford. ISSN 1354-1013; e-ISSN 1365-2486
|   |
| Trefwoorden |
Climate change
Marien/Kust |
| Author keywords |
community, elasmobranch, joint species distribution modeling, range shift, species traits |
| Auteurs | | Top |
- Coulon, N.
- Elliott, S.
- Teichert, N.
- Auber, A.
|
- McLean, M.
- Barreau, T.
- Feunteun, E.
- Carpentier, A.
|
|
| Abstract |
While spatial distribution shifts have been documented in many marine fishes under global change, the responses of elasmobranchs have rarely been studied, which may have led to an underestimation of their potential additional threats. Given their irreplaceable role in ecosystems and their high extinction risk, we used a 24-year time series (1997–2020) of scientific bottom trawl surveys to examine the effects of climate change on the spatial distribution of nine elasmobranch species within Northeast Atlantic waters. Using a hierarchical modeling of species communities, belonging to the joint species distribution models, we found that suitable habitats for four species increased on average by a factor of 1.6 and, for six species, shifted north-eastwards and/or to deeper waters over the past two decades. By integrating species traits, we showed changes in habitat suitability led to changes in the elasmobranchs trait composition. Moreover, communities shifted to deeper waters and their mean trophic level decreased. We also note an increase in the mean community size at maturity concurrent with a decrease in fecundity. Because skates and sharks are functionally unique and dangerously vulnerable to both climate change and fishing, we advocate for urgent considerations of species traits in management measures. Their use would make it better to identify species whose loss could have irreversible impacts in face of the myriad of anthropogenic threats. |
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