Species and clone-dependent effects of tilapia fish (Cichlidae) on the morphology and life-history of temperate and tropical Daphnia
| Autor: | Jayme M. Santangelo, Monique Tolardo, Aloysio da S. Ferrão-Filho |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Phenotypic plasticity education.field_of_study food.ingredient Ecology 010604 marine biology & hydrobiology Aquaculture of tilapia fungi Population Tilapia Interspecific competition Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Daphnia Predation food Temperate climate sense organs education human activities Ecology Evolution Behavior and Systematics |
| Zdroj: | Ecological Research. 31:333-342 |
| ISSN: | 1440-1703 0912-3814 |
| DOI: | 10.1007/s11284-016-1337-z |
| Popis: | In aquatic systems, tilapia introductions may result in marked changes in the structure of prey communities. In this study, we experimentally examined the effects of tilapia-mediated water at the individual and population levels of prey by exposing three Daphnia species to predation cues. We hypothesized that tilapia-mediated water determines reduced age and size at primipara, greater and faster reproduction, enhanced intrinsic rates of population increase (r), and longer tail spines in Daphnia; but that the magnitude of these changes would be species and clone-dependent. When three tropical D. laevis and one temperate D. similis clones were exposed to predation cues, adaptive changes were observed in some of the aforementioned parameters for each clone. The three D. laevis clones exhibited changes in all life-history and morphological measures. Temperate Daphnia spinulata displayed no changes but decreased r values in the presence of predators. The observed changes in the species and clones tested here suggest that, overall, both temperate and tropical Daphnia can detect and adaptively react to the risk of tilapia predation. However, only a fraction of the possible defenses may be displayed by individual clones. In contrast, D. spinulata seems more vulnerable to tilapia predation, given its long body length and absence of adaptive changes. Our study indicates that Daphnia can respond to tilapia-mediated water, and that interspecific and clonal variation exists between temperate and tropical species. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|