Efeitos da hidrodinâmica sobre a comunidade fitoplanctônica e grupos funcionais no Lago Grande do Curuai, PA

Abstract

The present study evaluated the structure of the phytoplankton community in Lago Grande de Curuai in different phases of a hydrological cycle, using different approaches: Taxonomic Classes, Functional Groups (GFs) and Functional Groups Based on morphology (GBFM), in Grande de Curuai, PA, in a hydrological cycle. The collections were performed monthly in a period of one year, in three sampling stations. The phytoplankton was quantified by the sedimentation method and the biovolume was measured by the specific geometric form method. A total of 101 taxa registered in the Great Lake of Curuai, distributed in eight major taxonomic categories: Chlorophyceae (31 taxa), Cyanobacteria (27 taxa), Bacillariophyceae (17 taxa), Coscinodiscophyceae (7 taxa), Zygnemaphyceae (7 taxa), Euglenophyceae (4 taxa), Dinophyceae (4 taxa), Cryptophyceae (3 taxa) and Synurophyceae (1 taxa). The 32 descriptive species (5% of total biomass) in relation to hydroperiods were categorized into 14 Functional Groups (K; H1; M; S1; L0; X2; Y; C; P; MP; A; W1; W2 and J ) and members of 5 Functional Groups Based on Morphology (MBFG): III, IV, V, VI and VII and 14 Functional Groups. The GFBM classification is a useful tool in the evaluation of ecological standards with robust ability to express the temporal dynamics of phytoplankton structure in this lake of várzeas.