ISSN:
1573-5117
Keywords:
plankton
;
feeding interference
;
Bosmina
;
Asterionella
;
south Andes lake
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Intensive sampling of a small temperate lake of the Araucanian region (Argentina), revealed changes in the demography of Bosmina longirostris when the diatom Asterionella formosa density increased (to 54 000 cells ml−1). Bosmina population behaviour in the field was consistent with the idea that large numbers of Asterionella caused its starvation. Individuals were actually colourless and fecundity dropped to zero, as was evident when Asterionella reached 99.4% of total phytoplankton biovolume. Since cyanophytes, as a whole, are scarce in these lakes, we propose that the flagellate/diatom ratio has a direct effect on cladoceran demography.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00006867
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