INVESTIGADORES
GABELLONE Nestor Adrian
artículos
Título:
SEASONAL CHANGES IN THE VERTICAL DISTRIBUTION OF ROTIFERS IN A EUTROPHIC SHALLOW LAKE WITH CONTRASTING STATES OF CLEAR AND TURBID WATER
Autor/es:
CLAPS, MARÍA CRISTINA; GABELLONE, N A; BENITEZ, HERNÁN
Revista:
ZOOLOGICAL STUDIES
Editorial:
ACAD SINICA INST ZOOLOGY
Referencias:
Lugar: TAIPEI; Año: 2011 vol. 50 p. 454 - 465
ISSN:
1021-5506
Resumen:
Monthly zooplankton samples were taken from a shallow Argentine lake during 1997-1998 and the spatial-temporal changes of rotifers in the water column examined. The most abundant and frequent species were: Brachionus calyciflorus, B. caudatus, B. havanaensis, Keratella tropica, Filinia longiseta, and Polyarthra vulgaris. These perennial species are considered to be common in eutrophic waters, are eurytopic, and are widely distributed. The phytoplankton composition, competition for food with other grazers, and predation pressure—plus the occurrence of different periods including a turbid phase, a phase with coverage of submerged macrophytes (Potamogeton pectinatus), and a flooding phase—defined the annual planktonic rotifer succession of the lake. The small-scale vertical distribution of rotifers in this homothermal lake was related to both biotic and abiotic forces. The presence of macrophytes favored an increase in planktonic-rotifer densities along with a specific richness associated with the possibilities of refuge, the incorporation of littoral species, and food diversification.