Tito de Morais A. auteur aut IRD Tito de Morais Luis auteur aut IRD text journalArticle eng text/pdf reformatted digital access The larval and juvenile fish of the Cayenne river estuary (French Guiana, South America) were sampled at two stations from June 1989 until October 1990. A total of 52989 individuals from 59 species, some still incompletely identified, were collected. Three families, Engraulidae, Gobiidae and Scianidae, accounted for over 97% of the total number of juveniles. The analysis of data over this period showed low diversity, and a difference in diversity between the two sampling locations (H' = 1.24 and 1.68). The results conform to some theoretical models of abundance that suggest a relative equilibrium of juvenile assemblages. In contrast, the seasonal variations in diversity and abundance and the results of a correspondence analysis showed significant differences in species distribution and in their relative abundance at the two sampling locations at certain periods, mainly in the rainy season. Our study indicates that, in spite of an apparent stability, the year to year variation in salinity and freshwater inputs could affect juvenile recruitment of some species and induces modifications in the composition of larval and juvenile estuarine fish assemblages. (Résumé d'auteur) specialized ESTUAIRE POISSON LARVE JUVENILE ECHANTILLONNAGE ABONDANCE VARIATION SAISONNIERE GUYANE FRANCAISE 036EAUCON01 17 18 216-225 1994 0160-8347 https://www.documentation.ird.fr/hor/fdi:42250 10.2307/1352571 0160-8347 [F B42250] https://www.documentation.ird.fr/hor/fdi:42250 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/42250.pdf IRD - Base Horizon / Pleins textes 1995-08-17 2015-07-02 fdi:42250 fre