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Limnological parameters and communities associated in the aquaculture wetland

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Author(s):
Aline Marcari Marques
Total Authors: 1
Document type: Master's Dissertation
Press: Jaboticabal. 2016-07-29.
Institution: Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal
Defense date:
Advisor: Lúcia Helena Sipaúba Tavares
Abstract

The aquatic plants are a relevant component of a constructed wetland for the treatment of aquaculture effluents due to their capacity in absorbing nutrients from water. The macrophytes provide better conditions for aquatic microorganisms to improve water quality. Current research evaluated the growth, chemicals composition and fauna associated with Eichhornia crassipes, the physical and chemical conditions of water, and sediment within the system for effluent treatment on an aquaculture farm (21°11´S; 48°18´W) at two growth periods of aquatic plant growth (February to May and July to October 2014). Fauna associated to E. crassipes were sampled with floating quadrants (0.09 m²); the macrophytes were washed and the plankton and macrofauna were fixed with 4% formalin; the specimens were then identified and counted. Diptera, Odonata, Rotifera, Copepoda, Protozoa, Ostracoda and Nematoda occurred at all collections in both periods of E. crassipes growth. Vorticella sp. was the predominant genus in the two periods; Protozoa and Rotifera species were the most abundant. The first period of growth revealed higher nitrogen and phosphorus rates in the water, whilst in the second period there was a greater nutrient retention in the sediment in front of the stand of macrophyte. Results showed that 60 days is the maximum time that E. crassipes may be maintained in the wetland to retain wastes from aquaculture; after this period biomass and the accumulation of nutrients in the vegetal tissue decreased. Total removal is mandatory after this period. Increased diversity and species richness followed the growth of biomass of aquatic plant in period of low rainfall, but with no relationship with water quality and sediment. The role of macrophytes is important for maintaining high diversity of organisms, but also to maintaining desirable water-effluent quality due to the accumulation of nutrients in the vegetal biomass. (AU)

FAPESP's process: 14/08186-9 - Limnological parameters and communities associated in the aquaculture wetland
Grantee:Aline Marcari Marques
Support type: Scholarships in Brazil - Master