The effect of environmental parameters and cyanobacterial blooms on phytoplankton dynamics of a Portuguese temperate lake

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Daniela R de Figueiredo (Autor) Outra; Ana S S P Reboleira (Autor) Outra; Sara C Antunes (Autor) Outra; Nelson Abrantes (Autor) Outra; Ulisses Azeiteiro (Autor) Outra; Fernando Goncalves (Autor) Outra; Mario J Pereira (Autor) Outra

Revista

Título: Hydrobiologia

Vol. 568

Páginas: 145-157

ISSN: 0018-8158

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 81 Citações

Scopus - 94 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: P-004-HH7

DOI: 10.1007/s10750-006-0196-y

Abstract (EN): The increasing occurrence of cyanobacterial blooms in freshwaters is of great concern due to the ability of many cyanobacteria to produce cyanotoxins. In the present work, the eutrophied Vela Lake (Central Portugal), used for recreational purposes and as a water source for agriculture, was monitored every fortnight between 2000 and 2001. Phytoplankton diversity and densities were measured and correlated to environmental parameters. A seasonal phytoplanktonic succession was observed and it was mainly correlated with conductivity, temperature, total suspended solids and nutrients availability (particularly phosphorus). Diatoms were dominant during winter months (inferior temperatures and higher nutrients availability) followed by green algae in early spring and then cyanobacteria from late spring until early autumn (less nutrient availability and higher temperatures). A massive cyanobacterial bloom of Aphanizomenon flos-aquae occurred early in May 2001 and was preceded by the lowest nitrogen levels measured in the water during all the study period. At the time of this bloom senescence, dissolved oxygen was severely depleted and a massive death of ichthyofauna was recorded. A Microcystis aeruginosa bloom was also detected in July 2001 and it occurred following a rapid decrease in abundance of green algae and diatoms. By considering not only the environmental parameters but also the occurrence of cyanobacterial blooms as explanatory variables in a canonical correspondence analysis, the variance explained for the phytoplanktonic assemblage during the study period was increased in about 7% achieving a total of 61.0%, indicating a correlation that may be due to the known competitive advantage and/or allelopathy of the bloom-forming cyanobacteria towards microalgae.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13