Dinâmica espaço-temporal do microfitoplâncton em viveiro de cultivo de LITOPENAEUS VANNAMEI (boone, 1931) e sua área de influência em um estuário amazônico.

Abstract

In order to formulate a better use of aquatic ecosystems it is necessary to evaluate the body of water, integrating and interacting simultaneously with the terrestrial environment, thus, in aquaculture activity is of extreme importance the study of the planktonic community, pointeding the phytoplankton, that representes an important role as a primary producer in aquatic ecosystems. The objective of this work was to characterize the structure of the microphytoplankton community of a marine shrimp nursery Litopenaeus vannamei and its adjacent area, during two periods, relating the abiotic and biotic factors that influence the spatiotemporal variation of microphytoplankton. For qualitative and quantitative analyzes, five points were collected delimited, using a plankton net (64μm) and was collected 200 mL of water directly from the water surface. The datas were submitted a treatment non-parametric tests (Mann-Whitney and Kruskal-Wallis, p<0,05). The indicator species were determined using the method (IndVal) and to evaluate the influence of the abiotic variables about microphytoplankton community, a RDA was performed. The microphytoplankton community contributed a total of 205 taxa (194 in the estuary and 107 in the nursery) Bacillariophyta with higher contribution mainly in the estuary. The environments were different in relation to the total density, once that the estuary presented higher density compared with nursery.