Data/hora: 02/06/2024 12:17:38

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 03/08/2000
Data da última atualização: | 31/03/2017
Autoria: | OLIVEIRA, M. D. de; CALHEIROS, D. F.
Afiliação: | EMBRAPA Pantanal (Corumba, MS).
Título: | Flood pulse influence on phytoplankton communities of the south Pantanal floodplain, Brazil.
Ano de publicação: | 2000
Fonte/Imprenta: | Hydrobiologia, v.427, 101-112, 2000.
Idioma: | Inglês
Conteúdo: | Four sites situated on the Pantanal floodplain (Paraguay River and floodplain) were sampled throught the annual cycle, mainly during the rising water period, with the aim of evaluating the effects of the flood pulse on the composition and population densities of the phytoplanktonic communities. Comprehensive water chemistry data were collected. Eighty-two taxa were found, numerically dominated by Chlorophyceae (23 taxa). Cryptophyceae (principal Cryptomonas brasiliensis) occurred in all samples, and were responsible for 47-58% of the phytoplankton abundance in the studied area. Highest phytoplanktonic population density was at the rising water period, when the limnological changes are most marked as the river water first enters into contact with the floodplain. During this period, when intense decomposition occurs, the Cryptothyceae decreased and the Euglenophyceae increased, except at site 1 (Castelo Lake), where this group were more stable during the year, representing 35-56% of the phytoplankton. In the falling water period (September and October), the phytoplankton was also represented by Bacillariophyceae and Cyanophyceae. In the pantanal, the great abundance and sometimes dominance of Cryptophyceae, may be due largely to adverse conditions for the development of other groups; the former are adapted to low availability of dissolved nutrients, and high water transparency, such conditions prevailing during the high water period.
Palavras-Chave: | Castelo Lake; Lago Castelo; Pantanal floodplain; Phytoplancton; Planicie de inundacao; Rio Paraguai.
Thesagro: | Fitoplâncton.
Thesaurus Nal: | Pantanal; Paraguay River.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (45266-1) - UPC - SP - PP - SP16176 -  - 16176 - DIS