Feeding behaviour of Acanthocyclops americanus (Marsh) (Copepoda: Cyclopoida)
Por:
Enriquez-Garcia, C, Nandini, S, Sarma, SSS
Publicada:
1 mar 2013
Categoría:
Ecology, Evolution, Behavior and Systematics
Resumen:
We evaluated the feeding rates and functional responses of A. americanus
using different concentrations and food types of Scenedesmus acutus
(Chlorophyceae), Brachionus havanaensis (Rotifera), Moina micrura
(Cladocera) and nauplii of A. americanus. The nauplii consumed only
algae, thereby competing with cladoceran neonates because their grazing
rates of 0.43x10(6) cells h(1) and 0.54x10(6) cells h(1) respectively,
are similar. The functional response of A. americanus showed similar
rates of consumption of prey nauplii (2.55 ind. h(1)) and cladoceran
neonates (2.73 ind. h(1)). The copepods had a higher preference for the
rotifer B. havanaensis regardless of its availability with regard to
other tested prey species. Nauplii of A. americanus could be strong
competitors of cladoceran neonates since both these crustaceans feed on
similar diets while the adult copepods are voracious predators consuming
their own nauplii, rotifers and cladocerans. Thus, A. americanus exerts
considerable impact on zooplankton communities through different
developmental stages.
Filiaciones:
Enriquez-Garcia, C:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Mexico City, DF, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Mexico City, DF, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Mexico City, DF, Mexico
|