Data/hora: 08/06/2024 16:19:26

Provedor de dados: | 20
País: | Belgium
Título: | Alteraciones de indicadores biológicos de   Gambusia puncticulata (Poey, 1854) en sitios muy contaminados del río Almendares
Autores: | Cabrera Páez, Y.
Data: | 2014-06-20
Ano: | 2007
Palavras-chave: | Fishes; Biological contamination; Eutrophication.
Resumo: | Se realizó una investigación con el objetivo de evaluar las alteraciones de los  procesos biológicos en los peces que viven en sitios muy contaminados. Se  aplicó una metodología basada en los efectos acumulativos de agentes  estresantes múltiples a nivel de individuo en la especie  Gambusia  puncticulata (Poey, 1854).   Este estudio se efectuó en tres sitios del río  Almendares: El Rodeo, considerado como  sitio de referencia, y dos sitios  altamente contaminados, el Bosque de La Habana y el Puente 23.  Se  encontró un incremento en el largo y el peso de las hembras, y en el factor  de condición para ambos sexos en los sitios más impactados.  Este resultado  se atribuye a la mayor disponibilidad de alimento debido a la eutrofización. El  índice gonadosomático, el índice de fecundidad específica y el número de  embriones por hembra, tuvieron valores significativamente más altos en el  sitio de referencia. El largo relativo del gonopodio no mostró diferencia  significativa entre sitios. A partir de los indicadores reproductivos analizados,  se puede concluir que la reproducción de  G. puncticulata se encuentra  comprometida en las zonas más contaminadas del río.  El índice  hepatosomático, presentó valores más altos en las hembras provenientes de  los sitios más contaminados. Las diferencias encontradas para δ13 C y δ15 N  entre los sitios contaminados y el de referencia sugieren que las fuentes de  alimento no son las mismas.  La metodología empleada permitió verificar la  existencia de alteraciones notables de  varios procesos biológicos en peces  que fueron colectados en sitios con un grado alto de contaminación.
Tipo: | Theses and Dissertations
Idioma: | Espanhol
Identificador: | http://hdl.handle.net/1834/5516
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Formato: | 105
Fonte: | http://creativecommons.org/licenses/by-nc/3.0/