Ecomorphological correlates of twenty dominant fish species of Amazonian floodplain lakes

Fishes inhabiting Amazonian floodplain lakes exhibits a great variety of body shape, which was a key advantage to colonize the several habitats that compose these areas adjacent to the large Amazon rivers. In this paper, we did an ecomorphological analysis of twenty abundant species, sampled in May and August 2011, into two floodplain lakes of the lower stretch of the Solimões River. The analysis detected differences among species, which could be probably associated with swimming ability and habitat use preferences. © 2017, Instituto Internacional de Ecologia. All rights reserved

High-resolution 87/86Sr analyses in freshwater mussels : time-series and cartography using femto-laser MC-ICP-MS [résumé]

Goldschmidt 2019, Barcelone, ESP, 18-/08/2019 - 23/08/201

Can we reconstruct river 87/86Sr variations using freshwater mussel geochemistry ? : first insight using femto-Laser MC-ICP-MS analyses

Workshop Latinoamericano de Otolitos y Otras Estructuras Calcificadas, Buenos Aires, ARG, 28-/08/2019 - 30/08/201

Freshwater Amazonian bivalve shells as archive of river hydrogeochemistry variations, insight from oxygen isotopes [résumé]

Workshop Latinoamericano de Otolitos y Otras Estructuras Calcificadas, Buenos Aires, ARG, 28-/08/2019 - 30/08/201

Seasonal oxygen isotope variations in freshwater bivalve shells as recorders of Amazonian rivers hydrogeochemistry

Freshwater bivalve shell oxygen isotope values (δ 18 OS) may act as a recorder of river δ 18 O variations that can then be interpreted in terms of hydrology (e.g. precipitation-evaporation balance, precipitation and river discharge patterns). We investigated the potential of this proxy measured across the hinge of South American unionid shells: Anodontites elongatus collected in Peru and A. trapesialis in Brazil. The isotopic signatures were reproducible between individuals of the same species. A. trapesialis clearly showed a strong δ 18 OS cyclicity in accordance with its growth patterns while A. elongatus presented less clear δ 18 OS with lower amplitude. We confirm that the deposition of successive growth lines and increments is annual, with growth line corresponding to the wet season. Also, we suggest that low amplitude of δ 18 OS in the A. elongatus shells indicates a habitat close to the river while large amplitude of δ 18 O cycles observed in A. trapesialis shells would reflect a floodplain lake habitat, seasonally disconnected from the river and thus subjected to higher seasonal fluctuations in water δ 18 O. Considering these promising first results, future studies could be directed towards the use of fossil shells to reconstruct the past and present hydrological and geochemical conditions of the Amazon