Production of the rotifer Brachionus plicatilis (Ploimida: Brachionidae) in a Brazilian coastal lagoon

• Main Authors: Maria Stela Maioli Castilho, Marlene Sofia Arcifa
• Format: Article
• Language: English
• Published: Vicerractoría Investigación 2000-12-01
• Series: Revista de Biología Tropical
• Subjects: coastal lagoon; zooplankton; Brachionus plicatilis; secondary production; mictic phase; South America
• Online Access: http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442000000400010

Secondary production, density and biomass fluctuations, and some reproductive aspects of the rotifer Brachionus plicatilis were studied weekly for two years in a Brazilian coastal lagoon. Food (and secondarily temperature) seemed to be the main factor involved in the summer increments. In the first summer, a mass mortality of fish caused changes in the phytoplankton, which switched from the dominance of Cyanophyceae to Chlorophyceae and other groups. For two months, production, density and biomass were relatively high until the recovery of the Cyanophyceae dominance. In the second summer, peaks of shorter duration and higher values of production, in comparison to the first one, were found. The contribution of resting eggs hatching, in the first summer, and the increment in parthenogenetic reproduction, in the second summer, would account for the population increases observed. Males and mictic females occurred when densities were high.