Flutuação anual e interanual da riqueza de espécies de desmídias (Chlorophyta – Conjugatophyceae) em um lago de inundação amazônico de águas pretas (Lago Cutiuaú, Estado do Amazonas, Brasil)

Abstract

Annual and interannual fluctuation of desmids species in a black water Amazon floodplain lake (Lago Cutiuaú, Amazonas State, Brazil). In this study, the seasonal and interannual fluctuations of desmids species richness was investigated for three years in an Amazon black water floodplain lake in the Negro River basin, Amazon State. The studied environment showed a great annual fluctuation of water column depth and high temperature values with little seasonal fluctuations. In general, pH and electrical conductivity values were low. One hundred five desmids species were identified distributed among families Closteriaceae, Gonatozygaceae and Desmidiaceae. Twenty three species are new references to Amazon State and are illustrated in this study. A marked seasonal fluctuation of desmids species was registered in association with the inundation pulse. The increased water level was the period of more species richness; on the other hand, the others periods showed low and similar species number. An interannual fluctuation of desmids species number was also registered, with the highest number in 2003, especially in the increased water level. Staurastrum Meyen and Closterium Nitzch were the genera with the highest species numbers. Based on this occurrence, the majority of species registered was rare or sporadic, registered in less than 10% or between 10 and 30% of total analyzed sample, respectively.

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

“…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.…”

“…The Amazon region has had a considerable number of studies carried out during the mid-20 th century by foreign researchers such as Grönblad (1945), Thomasson (1955Thomasson ( , 1971Thomasson ( , 1977, Förster (1963Förster ( , 1964Förster ( , 1969Förster ( , 1974, Scott et al (1965), Schmidt and Uherkovich (1973), Uherkovich and Schmidt (1974), Uherkovich and Rai (1979), and Uherkovich (1981). Only since the 1980s have the main contributors been Brazilian, such as Martins (1980Martins ( , 1982Martins ( , 1986aMartins ( , 1986b, Bittencourt-Oliveira (1990, 1993a, 1993b, Lopes (1992), Suarez-Mera (1995), Sophia and Huszar (1996), Ibañez (1998), Lopes and Bicudo (2003), Martins-da-Silva and Bicudo (2007), Souza et al (2007), Souza (2008Souza ( , 2012, Melo and Souza (2009), and Melo (2010, 2011). The most recent Brazilian researchers are Holanda et al (2019), Araújo et al (2020), and Saturnino et al (2020).…”

Contribuição ao conhecimento de Cosmarium Corda ex Ralfs (Desmidiaceae, Zygnematophyceae) para a Bahia e o Brasil

“…(HUEFS125604). Distribuição geográfica no Brasil: Amazonas (Melo & Souza 2009, Förster 1969, Goiás , Paraná (Cetto et al 2004).…”

Cosmarium (Desmidiaceae, Zygnemaphyceae) da ficoflórula perifítica do reservatório de Rosana, bacia do rio Paranapanema, Paraná/São Paulo, Brasil

“…Excluindo tais estados, as demais somam 15 publicações, sendo um para Mato Grosso (Souza & Bleich 2007) e Maranhão (Dellamano-Oliveira et al 2008), dois para Goiás (Felisberto & Rodrigues 2002, Felisberto & Rodrigues 2004, cinco para Rio Grande do Sul (Borge 1903, Ungaretti (1981a, b, Bicudo & Ungaretti 1986, Sophia et al 2005) e seis para Amazônia (Förster 1969, 1974, Huszar & Sophia 1996, Lopes & Bicudo 2002, Melo & Souza 2009). …”