Variación estacional del zooplancton del embalse Ignacio Allende, Guanajuato, México y su relación con el fitoplancton y factores ambientales

Revista de Biología Tropical

关键词: Seasonality;    phytoplankton;    zooplankton;    reservoir;    tropical;    México;   

DOI  :  

来源: DOAJ

【 摘 要 】

Se estudiaron las comunidades planctónicas y los factores ambientales del embalse Ignacio Allende de julio de 1990 a junio de 1991. Se presentó una proliferación de cianofíceas en el verano coincidente con el mayor nivel de agua, seguido por la dominacia de bacilariofíceas en los meses fríos, en primavera con el incremento en la temperatura las cloroficeas alcanzaron sus mayores densidades. Las dinofíceas y euglenofíceas presentaron la menor riqueza específica. La proliferación de Anabaena variabilis en el verano y la alta frecuencia de Ceratium hirundinella, Aulacosseira granulata y Fragilaria crotonensis se asocian con cuerpos de agua tropicales eutróficos. Se encontraron 39 taxones zooplanctónicos, de los cuales Diaphanosoma birgei, Bosmina longirostris, Daphnia parvula, Diaptomus (Mastigodiaptomus) montezumae, Acanthocyclops vernalis, Keratella cochlearis, Polyarthra vulgaris y Asplanchna priodonta, fueron persistentes en todo el ciclo. Un análisis de correspondencias canónicas mostró las relaciones que guardan los cambios en composición del zooplancton con las características físicas y químicas del embalse.
The plankton communities and environmental factors of the Ignacio Allende reservoir were surveyed from July 1990 to June 1991. A total of 57 phytoplankton species were identified. There was a blue green algae bloom in the summer, simultaneously with highest water levels, followed by the dominance of diatoms in the coldest months (February and March). Chlorophyceans became dominant in the spring, consonant with highest temperature records. Bacillariophyceans and cyanophyceans had the greater species richness, while dinophyceans and euglenophyceans had the lowest values. The summer bloom of Anabaena variabilis and the abundance of Ceratium hirundinella, Aulacosseira granulata and Fragilaria crotonensis are associated with tropical eutrophic waters. The zooplankton was composed by 39 species, from these, Diaphanosoma birgei, Bosmina longirostris, Daphnia parvula, Diaptomus (Mastigodiaptomus) montezumae, Acanthocyclops vernalis, Keratella cochlearis, Polyarthra vulgaris and Asplanchna priodonta occurred throughout the annual cycle. A canonical correspondence analysis showed a succesional pattern associated to several environmental processes. The lowest species richness occurred during the dry season, in the coldest months. In the wet season, species richness increased and population densities decreased, consonant with the blue-green algae bloom, the highest values of suspended solids and the highest water levels in the reservoir.

【 授权许可】

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