Cianobactérias planctônicas de um lago artificial urbano na cidade de Goiânia, GO

Abstract

-(Planktonic cyanobacteria from an artificial urban lake in the city of Goiânia, Goiás State). Fish farms are numerous in Goiás State and they are under intense recreational activity. However, studies about cyanobacteria in these environments are scarce, a concerning situation, since the occurrence of intense proliferation of phytoplankton in this kind of environments is common and there is the risk of blooms of toxic species. this paper aims to carry out the inventory of planktonic species of cyanobacteria occurring in a fishery pond (lake Jaó-a shallow artificial lake) in the city of Goiânia (16°39'13" S-49°13'26" W). Sampling was carried out during dry (2003 to 2008) and rainy periods (2009), when it was visually evident the occurrence of blooms. Climatic, morphometric and limnological variables were measured. The dry period was representative in the sampled years presenting a maximum of 50 mm of monthly precipitation in 2005. Thirty-one taxa of cyanobacteria were found belonging to the genera Dolichospermum (5 spp.), Aphanocapsa (4 spp.), Microcystis (3 spp.), Pseudanabaena (3 spp.), Radiocystis (2 spp.), Oscillatoria (2 spp.), and Bacularia,

Permanent occurrence of Raphidiopsis raciborskii and cyanotoxins in a subtropical reservoir polluted by domestic effluents (Itupararanga reservoir, São Paulo, Brazil)

“…For quantitative analysis of phytoplankton, integrated samples of the water column were collected with a plastic hose (1 m length) and were xed with 1% acetic lugol. The identi cation of cyanobacteria was based on the studies of Komárek & Anagnostidis (1999, 2005), Sant'Anna et al (2004, and Nogueira et al (2011). Counting was performed as described by Utermöhl (1958), using an inverted Zeiss AxioVert microscope.…”

Is it possible to evaluate the ecological status of a reservoir using the phytoplankton community?

“…For the phytoplankton sampling, mesh net with 20 µm was used in horizontal trawls at the water surface (one point per zone), and fixed with formaldehyde (4%); and by direct collection in the photic zone, fixed with 1% acetic lugol, the material was subsequently identified according to current works (Sant'anna et al, 2006;Biolo et al, 2008;Dellamano-Oliveira et al, 2008;Menezes et al, 2011;Nogueira et al, 2011;Ramos et al, 2012;Rosini et al, 2013;Aquino et al, 2014;Souza & Felisberto, 2014;Alves-da-Silva & Klein, 2015), and counted according to Utermöhl (1958) methodology, in sedimentation chambers (Lund et al, 1958) and inverted microscope Zeiss (Axiovert 40C). The density of the phytoplankton community (cel.L -1 ) was obtained from the count of the organisms in relation to the area of the used sample container (INAG, I.P., 2009), following the Equation 1.…”

Cyanobacteria de pesqueiros da região metropolitana de São Paulo, Brasil

“…61: 128. 1923 De acordo com Komárek & Anagnostidis (1999) e McGregor et al (2007, esta espécie é comumente encontrada no plâncton de lagos tropicais, confirmando a ampla distribuição desta espécie no Brasil (Uherkovich 1981;Peres & Senna 1998;Sant'Anna et al 2004;Sant'Anna et al 2007;Delazari-Barroso et al 2007;Borges et al 2008;Nogueira et al 2011;Martins et al 2012). As populações estudadas concordam com o material descrito por Johansen et al (2008), quanto aos tricomas constritos e grânulos nos septos, mas discordam do material descrito por Komárek & Anagnostidis (2005), quanto aos tricomas levemente ou indistintamente constritos.…”