Odinetz Collart Olga. (1991). Stratégie de reproduction de Macrobrachium amazonicum en Amazonie centrale (Decapoda, Caridea, Palaemonidae). Crustaceana, 61 (3), p. 253-270. ISSN 0011-216X.
Titre du document
Stratégie de reproduction de Macrobrachium amazonicum en Amazonie centrale (Decapoda, Caridea, Palaemonidae)
Année de publication
1991
Type de document
Article
Auteurs
Odinetz Collart Olga
Source
Crustaceana, 1991,
61 (3), p. 253-270 ISSN 0011-216X
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)
