Variaciones espacio-temporales del zooplancton en el embalse Chongón durante la estación seca del 2018
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El objetivo de este trabajo fue el de analizar la composición, abundancia y riqueza de
especies del zooplancton del embalse Chongón, Guayas, Ecuador y su relación con las
variables ambientales durante la estación seca (mayo-agosto) de 2018. Se identificaron
12 especies pertenecientes a tres grupos principales: nueve cladóceros, un ostrácodo y
dos copépodos. Las especies más frecuentes y abundantes fueron el cladócero Daphnia
mendotae (51,8%) y el ostrácodo Heterocypris incongruens (22,2%). La distribución de
especies fue homogénea en todos los puntos muestreados; sin embargo, existieron
diferencias significativas (p= < 0,0001) a nivel temporal, donde se observó una marcada
sucesión de especies. Las variables más relacionas con la comunidad de zooplancton
fueron los nutrientes, específicamente los compuestos nitrogenados, lo cual estaría
asociado a la disponibilidad de alimento, considerando que los nutrientes tienen una
relación directa con la producción primaria, a su vez, la riqueza de especie tiende a
aumentar con el incremento del oxígeno disuelto.
The aim of this work was to analyze the composition, abundance and richness of the zooplankton species and its relationship with the environmental variables during the dry season (May-August) of 2018 in Chongón reservoir, Guayas, Ecuador. A total of 12 species were identified and belonged to three main groups: nine cladocerans, one ostrocod and two copepods. The most frequent and abundant species were the cladocera Daphnia mendotae (51.8%) and the ostracod Heterocypris incongruens (22.2%). Species distribution was homogeneous in all sampling points; however, there were significant differences (p = <0.0001) at temporal level, where a marked succession of species was observed. The most related variables to the zooplankton community were nutrients, specifically nitrogen compounds, which would be associated to food availability, considering that nutrients have a direct relationship with primary production, at the same time, species richness tended to increase with the increasing of dissolved oxygen.
The aim of this work was to analyze the composition, abundance and richness of the zooplankton species and its relationship with the environmental variables during the dry season (May-August) of 2018 in Chongón reservoir, Guayas, Ecuador. A total of 12 species were identified and belonged to three main groups: nine cladocerans, one ostrocod and two copepods. The most frequent and abundant species were the cladocera Daphnia mendotae (51.8%) and the ostracod Heterocypris incongruens (22.2%). Species distribution was homogeneous in all sampling points; however, there were significant differences (p = <0.0001) at temporal level, where a marked succession of species was observed. The most related variables to the zooplankton community were nutrients, specifically nitrogen compounds, which would be associated to food availability, considering that nutrients have a direct relationship with primary production, at the same time, species richness tended to increase with the increasing of dissolved oxygen.
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ZOOPLANCTON, DAPHNIA MENDOTAE, HETEROCYPRIS INCONGRUENS, EMBALSE CHONGÓN