Cyanobacteria from coastal lagoons in southern Brazil: non-heterocytous filamentous organisms

Abstract

-(Cyanobacteria from coastal lagoons in southern Brazil: non-heterocytous fi lamentous organisms). This study describes and illustrates non-heterocytous fi lamentous cyanobacteria found in lagoon systems on the coastal plains of Rio Grande do Sul State. Collections were carried out in different freshwater bodies along the eastern (Casamento Lake area) and western (Tapes City area) margins of the Patos Lagoon (UTM 461948-6595095 and 542910-6645535) using a plankton net (25 μm mesh) in pelagic and littoral zones as well as by squeezing submerged parts of aquatic macrophytes, during both the rainy and dry seasons, from May to December/2003. Twenty two species belonging to the families Phormidiaceae (eight taxa), Pseudanabaenaceae (seven taxa), Oscillatoriaceae (six taxa), and Spirulinaceae (one taxon) were identifi ed. Among these species, fi ve are reported for the fi rst time from Rio Grande do Sul State: Leptolyngbya cebennensis, Microcoleus subtorulosus, Oscillatoria cf. anguina, O. curviceps and Phormidium formosum.

A new species of Trichodesmium (Cyanobacteria) from freshwaters, Brazil

“…Thus, Komárek & Anagnostidis (2005) analyzed and identified the material just as Trichodesmium sp. Comparing the Brazilian population with the literature data, and with the additional material recovered from Brazilian Herbaria, we conclude that the specimens presented by Martins et al (2012) as T. lacustre to South Brazil and those from Komárek & Komárková-Legnerová (2007) referred as T. cf lacustre to São Paulo state, are identical to our studied population and should be resigned into Trichodesmium brasiliense. As we could see, these materials also do not present attenuated trichomes, what is a quite common feature to T. lacustre.…”

“…Trichodesmium brasiliense Sant´Anna et al Fig. 1a-j Synonymous: Trichodesmium lacustre sensu Martins et al (2012) and Trichodesmium cf. lacustre sensu Komárek & Komárková-Legnerová (2007).…”

“…The type material is kept in the Herbarium of Institute of Botany, São Paulo, Brazil, under the accession number SP469314. Sample aliquots of analyzed material by Martins et al (2012) and Komárek & Komárková-Legnerová (2007) were recovered from Herbaria to compare the population described by these authors with the herein proposed species.…”

“…The first is restricted to tropical regions and the second occurs in temperate, tropical and subtropical areas (Komárek & Anagnostidis 2005). There are few references about freshwater Trichodesmium in Brazil and all of them refer to T. lacustre (Komárek & Komárková-Legnerová 2007;Martins et al 2012). However, the species has been problematic since its description, when Klebahn pointed out its similarity to heterocyst-free Aphanizomenon representatives (Klebahn 1895).…”

Cyanobacteria from a Brazilian subtropical freshwater water body

“…Anagnostidinema amphibium is commonly distributed in Brazilian tropical and subtropical regions, designated Geitlerinema amphibium (e.g., Torgan and Paula 1994, Nogueira 1999, Martins et al 2012b, and Rosini 2013 or Oscillatoria amphibia (e.g., Sant'Anna et al 1978, Senna and Ferreira 1986, Senna 1996, Werner and Rosa 1992, Azevedo et al 1996, and Torgan 1997. It was found in fresh and brackish water aquatic biotopes (plankton and periphyton), and also on moist soil, in north (Pernambuco state), central-west (Federal District and Goiás state), southeastern (Rio de Janeiro, São Paulo states) and southern (Rio Grande do Sul state) regions.…”