Odinetz Collart Olga auteur aut IRD text journalArticle fre text/pdf reformatted digital access The reproduction strategy of the Palaemonid shrimp, Macrobrachium Amazonicum, has been studied on Careiro Island in a floodplain lake in Central Amazonia. Ovigerous females have been observed all year round. Howether, three periods of the hydrological cycle were significantly more favourable to gonad ripening : the middle of the rising and of the falling of the water level, as well as the low level. This suggests the direct effect of two factors : the current velocity and the phytoplankton production. At the population level, the maximum reproduction velocity has been observed during low waters, and during rising waters. This strategy increases the survival of planktonic larvae during the highest phytoplankton production period, and reduces the intraspecific competition, increasing the larval dispersion in the floodplain. In the lake, the percentage of ovigerous females was always higher regardless of size class of the adult prawns and of season, than in the channels or in the river, suggesting that the lacustrine environment is the more favourable to M. amazonicum reproduction. In Eastern Amazonia, M. amazonicum shows a typical reproduction pattern of littoral Palaemonids : mass spawning occurs during the falling water, increasing the larval dispersion towards the estuary. The reproduction flexibility of M. amazonicum explains its success in colonizing a variety of environments in a wide geographical range in South America. (Résumé d'auteur) specialized CREVETTE EAU DOUCE REPRODUCTION FECONDITE MATURITE SEXUELLE PONTE LARVE CYCLE DE DEVELOPPEMENT ABONDANCE VARIATION SAISONNIERE ADAPTATION RELATION ESPECE ENVIRONNEMENT BRESIL 036EAUCON03 61 3 253-270 1991 0011-216X https://www.documentation.ird.fr/hor/fdi:40947 10.1163/156854091X00146 0011-216X [F B40947] https://www.documentation.ird.fr/hor/fdi:40947 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40947.pdf IRD - Base Horizon / Pleins textes 1995-01-17 2015-07-02 fdi:40947 fre