Abstract

GONZALEZ ANGARITA, ADRIANA DEL PILAR; ARANGUREN RIANO, NELSON JAVIER  and  GAVIRIA MELO, SANTIAGO. Changes Of The Population Structure Of Boeckella gracilis (Crustacea, Centropagidae) In The Plankton From Lago de Tota, Boyaca - Colombia. Acta biol.Colomb. [online]. 2008, vol.13, n.2, pp.61-72. ISSN 0120-548X.

The population of Boeckella gracilis Daday, 1902 of the lago de Tota, Boyacá, Colombia , was studied during a period of six months forthnightly starting in May 2004. The population density with a mean of 11.968 nd.m^-3 showed a progressive increase to the end of the period of study corresponding to high values of rain intensity in the region and high water level of the lake. Mature males dominated in density and biomass, achieving 32.5% and 35.8% respectively. Fecundity indicated a mean of 0.32 eggs for female. In the period of high water level an increase of the reproductive activity occured and was evidenced by the increment on fecundity and the highest copepodite density. The analysis of main components showed that transparency, pH and dissolved oxygen were the decisive variables for the temporal expression of the habitat. Biomass variation was positively associated to adult and copepodit density variation and negatively related to oxygen dissolved concentration in the lake.

Keywords : Boeckella gracilis; Copepoda Calanoida; Andean lake; zooplankton.

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