Demographic responses of Heterocypris incongruens (Ostracoda) related to stress factors of competition, predation and food
Por:
Fernandez, Rocio, Nandini, Sarma, Sarma, S. S. S., Elena Castellanos-Paez, Maria
Publicada:
1 ene 2016
Resumen:
Heterocypris incongruens is a widely distributed ostracod which can
maintain its populations under stressful conditions such as those in
temporary ponds and under low-quality diets, for example, detritus. It
often co-occurs with cladocerans and fish living in shallow water
bodies. Nevertheless, little is known about its response to the presence
of predators, its consumption capacity of cyanobacteria typically
present in eutrophic systems, and its interaction with other species in
similar habits. We studied here the demographic responses of H.
incongruens fed the green alga Scenedesmus acutus, two strains of
microcystis cf. aeruginosa and limnothrix sp. Experiments were conducted
separately and together in the presence of the cladoceran Simocephalus
vetulus and the cichlid fish, Oreochromis kairomones. The ostracod
maintained growth in all treatments, the reproductive output decreased
on dietary limnothrix sp., and its life expectancy was significantly
lower with the toxic strain of microcystis. The coexistence of both
crustacean species increased the rate of population growth (similar to
0.33 day(-1)) of S. vetulus and life expectancy (36-44 days) of H.
incongruens on the test diets compared with controls (23-33 days). Our
study suggests facilitation affects the interaction between the two
microcrustaceans, especially on poor quality cyanobacterial diets.
Filiaciones:
Fernandez, Rocio:
Univ Autonoma Metropolitana, Programa Doctorado Ciencias Biol & Salud, Campus Xochimilco, Mexico City 04960, DF, Mexico
Nandini, Sarma:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Div Invest & Posgrad, Campus Iztacala,Ave Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Div Invest & Posgrad, Campus Iztacala,Ave Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
Elena Castellanos-Paez, Maria:
Univ Autonoma Metropolitana, Lab Rotiferol & Mol Biol Plankton, Campus Xochimilco,Calzada Hueso 1100, Mexico City 04960, DF, Mexico
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