@article {6107, title = {Seasonal oxygen isotope variations in freshwater bivalve shells as recorders of Amazonian rivers hydrogeochemistry}, journal = {Isotopes in Environmental and Health Studies}, year = {2019}, pages = {1-15}, type = {Journal Article}, abstract = {

Freshwater bivalve shell oxygen isotope values (δ18OS) may act as a recorder of river δ18O variations that can then be interpreted in terms of hydrology (e.g. precipitation{\textendash}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 δ18OS cyclicity in accordance with its growth patterns while A. elongatus presented less clear δ18OS 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 δ18OS in the A. elongatus shells indicates a habitat close to the river while large amplitude of δ18OS 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 δ18O. 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.

}, keywords = {Amazon basin, freshwater bivalve shells, hydroclimate, isotope ecology, isotope hydrology, oxygen isotopes}, issn = {1025-6016 1477-2639}, doi = {10.1080/10256016.2019.1666120}, url = {https://hal.archives-ouvertes.fr/hal-02314885v1}, author = {Gaillard, Blandine and Claire E. Lazareth and Lestrelin, Hugo and Dufour, Elise and Santos, Roberto V. and Carlos E.C. Freitas and Marc Pouilly} } @article {5629, title = {Review of fisheries resource use and status in the Madeira River basin (Brazil, Bolivia and Peru) before the hydroelectric dam{\textquoteright}s completion}, journal = {Reviews in Fisheries Science \& Aquaculture }, volume = {26}, year = {2018}, pages = {494-514}, abstract = {

The Madeira River, which drains one of the major tributary river basins of the upper Amazon, contributes to small-scale fisheries in Peru, Bolivia, and Brazil. This paper provides a base-line of fisheries resources and their status in six sub-basins of the Madeira River: upper Madre de Dios River basin (Peru), Beni and Mamor{\'e} River basins (Bolivia), It{\'e}nez or Guapor{\'e} River basin (Bolivia and Brazil), middle Madeira, and (two sections of the) lower Madeira River (Brazil). Data were collected between 2009 and 2011, before the completion of two hydroelectric dams in the Brazilian portion of the basin. Biophysical, social, and biological indicators were used to characterize the fisheries. The results show an overall small-scale multispecies fisheries pattern but with notorious differences between the Madeira sub-basins. The Beni and Mamor{\'e} sub-basin shows the largest flooded area, with associated higher total fisheries yields. Trophic level of the catch, diversity, and mean weight of fish caught were shown to be very sensitive to exploitation level, river water type (white or clear water), flooded area, and the introduction of\ Arapaima gigas in Bolivia. The Bolivian fisheries are characterized by less exploited stocks, whereas stocks in Peru and Brazil show signs of intensive exploitation, resulting in fisheries of smaller bodied, lower trophic-level species. Landing data in the upper basin show a predominant reliance on migrating fish resources, which might be vulnerable to the construction of dams. These data serve as a baseline to evaluate anthropogenic impacts on the Madeira River basin fisheries in the future.

KEYWORDS:\ Amazon,\ freshwater ecosystem,\ trophic level,\ diversity,\ fish catch

}, doi = {The goliath catfish Brachyplatystoma rousseauxii has crucial economical and ecological functions in the Amazon basin. Although its life history characteristics have been studied in the Amazon, there is little information in the Madeira River basin, which }, author = {Doria, C R C and Fabrice Duponchelle and Lima, M A L and Garc{\'\i}a V{\'a}squez, A and Carvajal-Vallejos, F and Coca M{\'e}ndez, C and Catarino, M F and Carlos E.C. Freitas and Vega, B and Van Damme, P A} } @article {5922, title = {Trophic ecology of speckled peacock bass Cichla temensis Humboldt 1821 in the middle Negro River, Amazon, Brazil}, journal = {Ecology of Freshwater Fish}, volume = {27}, year = {2018}, pages = {1076{\textendash}1086}, doi = {10.1111/eff.12416}, url = {https://doi.org/10.1111/eff.12416}, author = {Jamerson Aguiar-Santos and Pieter A. P. deHart and Marc Pouilly and Carlos E.C. Freitas and Fl{\'a}via K. Siqueira-Souza} } @article {4679, title = {Trophic opportunism of central Amazon floodplain fish}, journal = {Freshwater Biology}, volume = {60}, year = {2015}, pages = {1659{\textendash}1670}, author = {Jean-Michel Mortillaro and Marc Pouilly and Wach, M and Carlos E.C. Freitas and Gwena{\"e}l Abril and Tarik Meziane} }