Ichthyofauna diversity and water quality in rivers in the southern zone of Costa Rica where dikes and channels were built to contain floods
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| Autor: | |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2023 |
| Descripción: | Introduction: Freshwater fish can be negatively affected by human disturbances like infrastructure, dikes or canals, and extensive agriculture, which affect forest cover and promote sedimentation. Objetive: To evaluate the spatio-temporal composition of freshwater fish and its relationship with some physical-chemical water variables in three tropical rivers. Methods: I worked in the Grande de Térraba y Esquinas basins, Costa Rica, in three control sites and three sites with dike and channel influence. I sampled twice a month at the end of the rainy season (October-December, 2010) and the beginning of the dry season (January-March, 2011). I measured water quality variables and determined the type of environment or substrate, speed and altitude. Results: I captured 742 fish (24 species, 12 families). The most representative were Astyanax aeneus (44%), Poeciliopsis retropinna (14%), Dormitator latifrons (8%), Priapichthys panamensis (7%), Cryptotheros sajica (6%) and Brachyrhaphis roseni (4%). There were no statistically significant differences among sites. Conclusion: The fluctuations of environmental variables, and the trends in fish abundance, richness, and distribution, did not differ among control sites and anthropologically affected sites. |
| País: | Portal de Revistas UNED |
| Institución: | Universidad Estatal a Distancia |
| Repositorio: | Portal de Revistas UNED |
| Lenguaje: | Español |
| OAI Identifier: | oai:revistas.investiga.uned.ac.cr:article/4584 |
| Acceso en línea: | https://revistas.uned.ac.cr/index.php/cuadernos/article/view/4584 |
| Palabra clave: | fish infrastructure biodiversity abundance richness Osa Peces infraestructura biodiversidad abundancia riqueza |