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Within- and trans-generational responses to combined global changes are highly divergent in two congeneric species of marine annelids

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Thibault, Cynthia et Massamba-N'Siala, Gloria et Noisette, Fanny et Vermandele, Fanny et Babin, Mathieu et Calosi, Piero (2020). Within- and trans-generational responses to combined global changes are highly divergent in two congeneric species of marine annelids. Marine Biology, 167 .

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Résumé

Trans-generational plasticity (TGP) represents a primary mechanism for guaranteeing species persistence under rapid global changes. To date, no study on TGP responses of marine organisms to global change scenarios in the ocean has been conducted on phylogenetically closely related species, and we thus lack a true appreciation for TGP inter-species variation. Consequently, we examined the tolerance and TGP of life-history and physiological traits in two annelid species within the genus Ophryotrocha: one rare (O. robusta) and one common (O. japonica). Both species were exposed over two generations to ocean acidification (OA) and warming (OW) in isolation and in combination (OAW). Warming scenarios led to a decrease in energy production together with an increase in energy requirements, which was lethal for O. robusta before viable offspring could be produced by the F1. Under OA conditions, O. robusta was able to reach the second generation, despite showing lower survival and reproductive performance when compared to control conditions. This was accompanied by a marked increase in fecundity and egg volume in F2 females, suggesting high capacity for TGP under OA. In contrast, O. japonica thrived under all scenarios across both generations, maintaining its fitness levels via adjusting its metabolomic profile. Overall, the two species investigated show a great deal of difference in their ability to tolerate and respond via TGP to future global changes. We emphasize the potential implications this can have for the determination of extinction risk, and consequently, the conservation of phylogenetically closely related species.

Type de document : Article
Validation par les pairs : Oui
Information complémentaire : Voici la version suivant la révision par les pairs, mais précédant la mise en page officielle d’un article publié dans Marine Biology. La version finale et authentifiée est disponible en ligne : https://doi.org/10.1007/s00227-019-3644-8 This is a post-peer-review, pre-copyedit version of an article published in Marine Biology. The final authenticated version is available online at:https://doi.org/10.1007/s00227-019-3644-8
Version du document déposé : Post-print (version corrigée et acceptée)
Départements et unités départementales : Institut des sciences de la mer de Rimouski (ISMER)
Déposé par : DIUQAR UQAR
Date de dépôt : 11 mars 2021 16:11
Dernière modification : 11 mars 2021 16:11
URI : http://semaphore.uqar.ca/id/eprint/1753

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