Diversidad de condricthyes y osteichthyes en tres ecosistemas marinos: manglar, arrecife coralino y rocoso de la zona submareal de la isla San Cristóbal
Fecha
2011
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Universidad de Guayaquil Facultad de Ciencias Naturales Escuela de Biología
Resumen
El presente trabajo fue realizado en San Cristóbal- Galápagos, empleando la metodología de transectos lineales de peces en tres tipos de ecosistemas: coral, rocoso y manglar, se utilizó un carrete con una cinta de 50 metros para realizar transectos lineales en donde se registraron las especies de peces y número de individuos para cada una. Se escogieron cinco sitios de la isla representantes de los tres ecosistemas: Isla Lobos, Las Negritas, La Tortuga, Rosa Blanca Manglar, Rosa Blanca Coral y Punta Pitt, desde Febrero hasta Agosto del 2010. Se identificaron un total de 66 especies distribuidas en 32 familias, de las cuales tan solo en 10% resultaron ser especies endémicas a Galápagos, la mayor parte de especies registradas en este estudio fueron especies de amplia distribución y panámicas.
Se detectaron diferencias significativas en los índices de dominancia y riqueza específica entre los ecosistemas manglar-rocoso y manglar-coral, al comparar las diferencias temporales para cada sitio, sólo en las Negritas se evidenciaron estas diferencias (ANOVA dos vías, Tukey P< 0,05). A nivel de la estructura comunitaria de peces, los corales y ecosistemas rocosos fueron similares, mientras que los manglares resultaron diferentes con respecto a los otros dos ecosistemas.
The present research was done in San Cristóbal – Galápagos applying the lineal transects methodology in three types of ecosystems which are coral, rocky and mangrove, using a 50 meters line to do the transects and taking the fish data about specie and number of individuals. There were chosen five sub tidal places around the island: Isla Lobos, Las Negritas, La Tortuga, Rosa Blanca and Punta Pitt, since February to August 2010. We identified a total of 66 species between 32 families, just the 10% resulted to be endemic to Galápagos, the most part of the species registered for this research were wide distribution species and panamic. There were detected differences between diversity, dominance and specific richness between mangrove – rocky and mangrove – coral ecosystems, comparing the temporal differences for each site, just in Las Negritas were evidence of these differences (two ways ANOVA, Tukey P< 0,05). The fish community structure, the corals and rocky ecosystems were similar, while the mangroves resulted different referring to the other ecosystems
The present research was done in San Cristóbal – Galápagos applying the lineal transects methodology in three types of ecosystems which are coral, rocky and mangrove, using a 50 meters line to do the transects and taking the fish data about specie and number of individuals. There were chosen five sub tidal places around the island: Isla Lobos, Las Negritas, La Tortuga, Rosa Blanca and Punta Pitt, since February to August 2010. We identified a total of 66 species between 32 families, just the 10% resulted to be endemic to Galápagos, the most part of the species registered for this research were wide distribution species and panamic. There were detected differences between diversity, dominance and specific richness between mangrove – rocky and mangrove – coral ecosystems, comparing the temporal differences for each site, just in Las Negritas were evidence of these differences (two ways ANOVA, Tukey P< 0,05). The fish community structure, the corals and rocky ecosystems were similar, while the mangroves resulted different referring to the other ecosystems
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TRANSECTOS, ISLA SAN CRISTÓBAL, ECOSISTEMAS MARINOS, CONDRICTHYES Y OSTEICHTHYES