Effects of allelochemicals released by vertebrates (fish, salamander and tadpole) on Moina macrocopa (Cladocera)
Por:
Gama-Flores, JL, Huidobro-Salas, ME, Sarma, SSS, Nandini, S
Publicada:
1 abr 2013
Resumen:
We studied the survivorship (average lifespan, life expectancy at birth and generation time) and reproduction (gross and net reproductive rates, and the rate of population increase) of Moina macrocopa, a common cladoceran found in many freshwater bodies of Mexico. We used 3-conditioned-media obtained from (a) fish (Poeciliopsis occidentalis), (b) axolotl (Ambystoma mexicanum) and (c) frog tadpole (Hyla eximia). Standard life table demography experiments were done at laboratory temperature (22°C) on neonates from a single parthenogenetic female of M. macrocopa and fed Chlorella at 1.0x106 cells ml-1. Compared with survivorship variables, the age-specific reproduction of M. macrocopa was more dramatically influenced by the predator conditioned-medium. Compared with controls, there was a significant increase in the offspring production in all three treatments involving the vertebrate conditioned medium; the highest was observed in the tadpole conditioned medium while the lowest was with Ambystoma-conditioned medium. Average lifespan (ALS), gross (GRR) and net reproductive rates (NRR), generation time (GT) and the rate of population increase (r) were all significantly affected depending on the vertebrate-conditioned medium. For example, ALS was adversely affected due to Ambystoma while, it was stimulated due to fish-conditioned medium. Gross and net reproductive rates were lowest in control than in conditioned media from fish, frog tadpoles and axolotl. Generation time was lowest (6 days) in controls and in axolotlconditioned medium but longer (9 days) in treatments containing fish or frog tadpoleconditioned medium. The three conditioned-media from the predators induced the differential changes in life traits of M. macrocopa. The effects of kairomones in Ambystoma-conditioned medium, however, than other two on the measured demographic variables of M. macrocopa.
Filiaciones:
Gama-Flores, JL:
Univ Nacl Autonoma Mexico, Tlalnepantla 54090, State Mexico, Mexico
Huidobro-Salas, ME:
Univ Nacl Autonoma Mexico, Tlalnepantla 54090, State Mexico, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Tlalnepantla 54090, State Mexico, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Tlalnepantla 54090, State Mexico, Mexico
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