Palabras clave
niche
reservoir
threatened species
life history theory
especie migratoria
nicho
especie amenazada
teoría de historia de vida
Cómo citar
Resumen
Introducción: Los embalses hidroeléctricos tienen varios impactos en los peces migratorios, como la disminución de su abundancia, extinciones locales y cambios en la estructura del ensamblaje. Objetivo: Investigar las estrategias tróficas y reproductivas de Leporinus piau en aguas arriba y aguas abajo de un embalse hidroeléctrico en el río Parnaíba. Métodos: Para caracterizar la estrategia de alimentación, identificamos los alimentos consumidos y calculamos la amplitud del nicho trófico en ambos sitios. Para determinar diferencias en la dieta entre los sitios, realizamos un análisis Permutacional Multivariado de Varianza (PERMANOVA), seguido de un análisis SIMPER para mostrar cuales elementos generaron las diferencias. Para caracterizar la estrategia reproductiva, analizamos relación longitud/peso, factor de condición, índice gonadosomático y talla en la primera madurez. Resultados: Leporinus piau se clasificó como omnívoro con una dieta predominantemente de origen vegetal en ambos sitios. La dieta y la amplitud de nicho variaron entre sitios. El factor de condición difirió entre sitios mientras que la talla en la primera madurez difirió entre sitios y sexos. Conclusiones: Las variaciones de Leporinus piau aguas arriba y aguas abajo del embalse hidroeléctrico en el río Parnaíba, son resultado de diferencias en los rasgos de historias de vida, como es propuesto en la teoría de historia de vida que aclara las diferencias en las estrategias tróficas y reproductivas.
Citas
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