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标题：Demographic responses of Heterocypris incongruens (Ostracoda) related to stress factors of competition, predation and food
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作者：Rocio Fernandez ; Sarma Nandini ; S.S.S. Nandini 等
期刊名称：Journal of limnology
印刷版ISSN：1129-5767
电子版ISSN：1723-8633
出版年度：2016
卷号：75
期号：s1
页码：31-38
DOI：10.4081/jlimnol.2016.1367
出版社：Istituto italiano di idrobiologia
摘要：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.
关键词：Cladocera;fish kairomones;cyanobacteria;facilitation;demography.