INVESTIGADORES
QUEIMALIÑOS claudia Patricia
artículos
Título:
The coexistence of Bosmina and Ceriodaphnia in a South Andes lake: an analysis of the demographic responses
Autor/es:
BALSEIRO, EG; MODENUTTI, BE; QUEIMALIÑOS, CP
Revista:
FRESHWATER BIOLOGY (PRINT)
Editorial:
Blackwell Publishing
Referencias:
Lugar: Oxford; Año: 1992 vol. 28 p. 93 - 101
ISSN:
0046-5070
Resumen:
1. The coexistence of Bosmina and Ceriodaphnia was studied in relation to phytoplankton succession in a small lake (Laguna Ezquerra) in the araucanian region of Argentina. 2. The study involved field sampling and single species cultures of each of the two cladocerans in lake water under laboratory conditions. 3. Ceriodaphnia showed a unimodal cycle while Bosmina had a bimodal pattern during 4 months of coexistence. Ceriodaphnia exhibited a direct relationship between clutch size and biovolume of edible algae, whereas Bosmina's fecundity was related to the density of flagellates. 4. We found that the fecundity of these spedes responded differently to laboratory and field conditions. The fecundity of Ceriodaphnia followed the same pattern in both the field and laboratory, whereas Bosmina showed higher fecundity values in laboratory experiments. 5. Our results are in good agreement with predictions derived from Northern Hemisphere studies, indicating that food-limited populations of daphnids and Bosmina can coexist for extended periods in spatially homogeneous environments. 6. The variation in food availability, measured as biovolume of edible algae, determinesthe loss of Ceriodaphnia and the persistence of Bosmina.