Desmídias filamentosas (Conjugatophyceae) de um lago de inundação de águas pretas na Amazônia Central

Abstract

RESUMOCom base em 109 amostras coletadas em diferentes fases do ciclo hidrológico nos anos de 2002 a 2004 Filamentous desmids (Conjugatophyceae) from a floodpulse black water lake in Central Amazon ABSTRACTA taxonomic survey regarding the filamentous desmids species was carried out made based on 109 samples collected in different phases of the hydrological cycle between the years of 2002 and 2004 in Cutiuaú lake, an black water system located in Jau National Park in the Negro river basin. A total of 15 filamentous desmids species distributed in seven genera were identified. Desmidium C. Agardh ex Ralfs, with seven species, was the genera with more species richness, being D. quadratum mentioned for first time in Amazonas State. Three Groenbladia Teiling species and one of Bambusina Kützing ex Kützing, Hyalotheca Ehrenberg ex Ralfs, Phymatodocis Nordstedt, Spondylosium Brébisson ex Kützing and Teilingia Bourrelly were registered. In relation to hydrological cycle, three taxa were registered in the low water period, six in the decreasing water period, eight in the high water period and 15, all of identified taxa, in the increasing water period.

Some interesting desmids (Desmidiaceae, Zygnematophyceae): first records, taxonomic notes, and distribution for the Amazon Brazilian flora

“…conducted in several aquatic ecosystems, including floodplains, shallow lakes, wetlands, and rivers. Especially for flood plains, the three types of water-clear, white, and black-are important in the dynamics and structure of the algal community (Junk et al 1989;Souza and Melo 2010). In clear-and white-water floodplains there are more species reported in the literature as the result of the greater number of studies in these environments (Melo and Souza 2009).…”

“…In addition, high temperatures and low dissolved oxygen (<5.5 mg•L −1 ) were dominant (Table 1). Acidity and low conductivity of water are very common in the aquatic ecosystems of the Amazon region (Melo and Souza 2009;Souza and Melo 2010), especially during the rainy season.…”