Abstract
The vertical distribution of Bomina, Daphnia, Ceriodaphnia, Diaptomus and cyclopoids was studied for a 48 hours period in Arenal Reservoir, Costa Rica. In general the zooplankton decreased during day time across the water colurnn. Daphnia, Diaptomus and the cyclopoids had a constant depth distribution with time, whereas Bosmina, and Ceriodaphnia showed slight evidence of vertical migration. Due to the scarcity of planktivorous fishes in the lirnnetic zone of the reservoir, the migration of small-sized cladocerans is purpoudtely explained by invertebrate predation pressure (e.g. cyclopoids).
Highlights
Abstraet: The vertical distribution oC Bomina, Daphnia, Ceriodaphnia, Diaptomus and cyclopoids was studied Cor a 48 hours period in Arenal Reservoir, Costa Rica
Las larvas Nauplio, Ceriodaphnia y Bosmina fueron los organismos más abundantes en todas las muestras recolectadas
La hipótesis que plantea una mayor eficiencia metabólica y reproductiva por migrar a zonas de mayor temperatura durante la noche no parece aplicarse aquí pues la temperatura mínima no baja de los 23 oc
Summary
Abstraet: The vertical distribution oC Bomina, Daphnia, Ceriodaphnia, Diaptomus and cyclopoids was studied Cor a 48 hours period in Arenal Reservoir, Costa Rica. La distribución vertical del zooplancton ha sido ampliamente estudiada y se ha notado que tanto en agua dulce como en el mar muestra un comportamiento migratorio (Murtauhg 1985, Vinogradov et al 1985). La clorofila a mostró una distribución vertical con un pico a 7 m (Fig. 1C).
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