Demographic responses of Heterocypris incongruens (Ostracoda) related to stress factors of competition, predation and food

https://doi.org/10.4081/jlimnol.2016.1367

Authors

  • Rocio Fernandez Autonomous Metropolitan University, Mexico.
  • Sarma Nandini | nandini@unam.mx National Autonomous University of Mexico, Mexico.
  • S.S.S. Nandini National Autonomous University of Mexico, Mexico.
  • Maria E. Castellanos-Páez Autonomous Metropolitan University, Mexico.

Abstract

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 (~ 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.

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Published
2016-03-22
Info
Issue
Section
6th National Congress of Limnology
Supporting Agencies
Autonomous Metropolitan University, CONACyT, SNI, UNAM
Keywords:
Cladocera, fish kairomones, cyanobacteria, facilitation, demography.
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How to Cite
1.
Fernandez R, Nandini S, Nandini S, Castellanos-Páez ME. Demographic responses of Heterocypris incongruens (Ostracoda) related to stress factors of competition, predation and food. J Limnol [Internet]. 2016 Mar. 22 [cited 2021 Oct. 18];75(s1). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2016.1367