Tática reprodutiva e estrutura da população de Cichla monoculus Spix & Agassiz, 1831 (Perciformes, Cichlidae) em ambientes com diferentes regimes hidrológicos.
This study assumed that some species are able to change the reproductive tactic depending on currently environmental conditions. The tested hypothesis is that the peacock bass Cichla monoculus, an introduced species of Amazonian region, presents a differential reproductive tactic that depends on the...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | Brasil |
| Institución: | Universidade Estadual de Maringá (UEM) |
| Repositorio: | Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
| Idioma: | portugués |
| OAI Identifier: | oai:localhost:1/4916 |
| Acceso en línea: | http://repositorio.uem.br:8080/jspui/handle/1/4916 |
| Access Level: | acceso abierto |
| Palabra clave: | Tucunaré Espécie introduzida Reprodução Planície de inundação Reservatório Cichla monoculus Spix & Agassiz, 1831 Brasil. Peacock bass Introduced species Reproduction Floodplain Reservoir Brazil. Ciências Biológicas Ecologia |
| Sumario: | This study assumed that some species are able to change the reproductive tactic depending on currently environmental conditions. The tested hypothesis is that the peacock bass Cichla monoculus, an introduced species of Amazonian region, presents a differential reproductive tactic that depends on the variation of the hydrometric level on the upper Paraná River floodplain and Corumbá Reservoir. The hydrological analysis showed that the level on the floodplain was very irregular compared to the level on the reservoir, presenting often potamophases. Limnophases were less frequent and of long duration. Because of the short retention time, hydrometric level variations on reservoir were of less than 9 cm above and below the overflow level, with the same number of potamophases and limnophases, both of them of similar duration. Either in the floodplain as in the reservoir, abundance peaks of juveniles occurred on potamophases. In the floodplain, these peaks were associated to sharp increase of short duration of the hydrometric level, especially in February 2000 and March 2003. In the reservoir, the occurrence of juveniles was registered practically in all samplings, with two peaks in April and December 1998, corresponding to the rainfall period. In both systems, juvenile abundance was positively correlated with the hydrometric level. It was concluded that C. monoculus changes its reproductive tactic responding to variations of hydrometric level and environmental seasonality. |
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