QUEIMALIÑOS claudia Patricia
congresos y reuniones científicas
Nutrient recycling and shifts in N:P ratio by different zooplankton structures in a South Andes lake.
BALSEIRO, EG; MODENUTTI, BE; QUEIMALIÑOS, CP
Congreso; II Southern Connection Congress; 1997
In southern Andean lakes, zooplankton succession is characterized by a change in the dominance from the calanoid copepod Boeckella gracilipes in winter and spring, to the cladoceran Bosmina longirostris in mid-summer, and the rotifer Polyarthra vulgaris in late summer. We performed three series of field experiments at different times: late spring, summer and late summer to examine the role of zooplankton constitution in the released N:P ratio. We observed that changes in the zooplankton constitution over the annual cycle may change the nutrient supply ratio. In southern Andean lakes B. gracilipes would decrease P limitations lowering the N:P ratio, whereas B. longirostris tends to increase the N:P ratio and therefore increases P limitation during summer.