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Titre :	Settlement patterns of brachyuran megalopae in a Louisiana estuary
Auteurs :	B. E. Hasek, Auteur ; N. N. Rabalais, Auteur
Type de document :	Article
Dans :	Estuaries (24(6A) DEC 2001)
Article en page(s) :	796-807
Résumé :	Artificial substrate collectors were used to sample settled brachyuran megalopae in Terreboune Bay, Louisiana. northern Gulf of Mexico. Three taxa, Callinectes sapidus, Uca spp., and Rhithropanopeus harrisii, were the most common settlers. Settlement occurred almost year-round, although settlement densities were highest in late summer and early fall. In 1990, all three taxa had several simultaneous settlement peaks; in 1991, one simultaneous Settlement peak occurred. Fewer C. sapidus and Uca spp. settled in 1991 than in 1990, but settlement abundance of R. harrissii was similar between years. Local weather events, such as heavy precipitation, may have influenced the lower abundances of C. sapidus and Uca spp. in 1991. The megalopae of C. sapidus and Uca spp., which re-invade the estuary from higher salinity offshore waters where larval development occurs, may have been more affected by the lower 1991 estuarine salinity values than the larvae of R. harrissii, which are retained within the estuary throughout larval development. Settlement of C. sapidus and Uca spp. was correlated with maximum tidal height, tidal amplitude, salinity, temperature, and lunar phase. In 1990, settlement of C. sapidus was correlated with lunar declination cycles, settlement peaks occurred during equatorial minimum amplitude tides. The settlement of R. harrisii was associated with tidal amplitude and lunar phase. Associations between environmental variables and settlement of megalopac were not consistent between die two years sampled. The opposing or reinforcing effects of various environmental variables on settlement, e.g., tidal height and rainfall, arc superimposed on long-term hydrologic cycles so that dramatically altered cycles of settlement occur among years.

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