A step towards measuring connectivity in the deep sea: elemental fingerprints of mollusk larval shells discriminate hydrothermal vent sites - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biogeosciences Année : 2024

A step towards measuring connectivity in the deep sea: elemental fingerprints of mollusk larval shells discriminate hydrothermal vent sites

Résumé

Deep-sea hydrothermal vent systems are under investigation for base and precious metal exploitations. The impact of mining will depend critically on the ability of larval dispersal to connect and replenish endemic populations. However, assessing connectivity is extremely challenging, especially in the deep sea. Here, we investigate the potential of elemental fingerprinting of mollusk larval shells to discriminate larval origins between multiple hydrothermal sites in the southwest Pacific Ocean. The gastropod Shinkailepas tollmanni represents a suitable candidate as it uses capsules to hold larvae before dispersal, which facilitates sampling and ensures mineralization occurs on the site of origin. Multielemental microchemistry was performed using cutting-edge femtosecond laser ablation inductively coupled plasma mass spectrometry analysis to obtain individual measurements on 600 encapsulated larval shells. We used classification methods to discriminate the origin of individuals from 14 hydrothermal sites spanning over 3500 km, with an overall success rate of 70 %. When considering fewer sites within more restricted areas, reflecting dispersal distances reported by genetic and modeling approaches, the success rate increased up to 86 %. We conclude that individual larval shells register site-specific elemental signatures that can be used to assess their origin. These results open new perspectives to get direct estimates on population connectivity from the geochemistry of pre-dispersal shells of recently settled juveniles.
Fichier principal
Vignette du fichier
Mouchi et al. 2024_Biogeosciences.pdf (4.02 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY - Paternité

Dates et versions

hal-04494834 , version 1 (07-03-2024)

Licence

Paternité

Identifiants

Citer

Vincent Mouchi, Christophe Pécheyran, Fanny Claverie, Cécile Cathalot, Marjolaine Matabos, et al.. A step towards measuring connectivity in the deep sea: elemental fingerprints of mollusk larval shells discriminate hydrothermal vent sites. Biogeosciences, 2024, 21 (1), pp.145-160. ⟨10.5194/bg-21-145-2024⟩. ⟨hal-04494834⟩
28 Consultations
4 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More