Abstract

VILLALBA DURE, Gustavo Adolfo; BENITEZ RODAS, Gilberto Antonio  and  NUNEZ GORALEWSKI, Karina Beatriz. Influence of environmental factors on the zooplankton community of the artificial lagoons in Ñu Guasú Park, Central Department, Paraguay. Investig. Agrar. [online]. 2018, vol.20, n.1, pp.58-66. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2018.junio.58-66.

Zooplankton is an important component in the biotic community in an aquatic ecosystem because they act as bio-indicators. The aim of this study was to determine the effect of environmental factors on zooplankton diversity in the lagoons of the ÑuGuasú Park. Water samples were taken and were measured in situ pH, conductivity, temperature and dissolved oxygen; in the laboratory and BOD5, COD, turbidity, total nitrogen and total phosphorus. For biological analysis, species richness and abundance were determined with Pearson correlation coefficient and canonical redundancy analysis (RDA). 10 species were recorded being rotifers the most abundant with 9 species in Laguna 1 and 8 species in Laguna 2. The abundance in Laguna 1 and 2 was identified 90 and 87 individuals respectively. The environmental factors had greater influence on the species in Lagoon 1 were Total Phosphorus, tansparency and temperature compared to Philodina sp. Macrothrixelegans and Sidacrystallina, while in Laguna 2, Total Nitrogen, Total Phosphorus and pH had greater relationship with the species Keratellacochlearis, Alona sp., Sidacrystallina and Eudiaptomusgracilis concluding the zooplankton community of both lagoons responded in different ways to environmental factors.

Keywords : environmental factors; diversity; ÑuGuasú Park; zooplankton.

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