Pinnularia (Bacillariophyta) do curso inferior do rio Negro, Amazonas, Brasil: taxonomia e distribuição temporal

Abstract

RESUMOEste estudo relata a taxonomia e distribuição temporal do gênero Pinnularia ocorrente no curso inferior do rio Negro (03º02'46,5"S e 60º15'13,1"W) ao longo de um ciclo anual. O trabalho foi conduzido a partir da análise de amostras coletadas na coluna d'água, em escala mensal, entre os meses de outubro de 2002 a setembro de 2003. As espécies foram descritas e comentadas com base na sua morfologia e morfometria. Onze espécies e quatro variedades foram identificadas, ilustradas e incluídas em chave taxonômica. Dois táxons registrados neste estudo, P. sterrenburgii var. sterrenburgii Metzeltin & Lange-Bertalot e P. subgibba var. capitata Metzeltin & Krammer, constituem primeira citação de ocorrência para o rio Negro. Temporalmente, a maior riqueza de espécies ocorreu entre os meses de outubro a dezembro de 2002, período de águas baixas, quando houve provavelmente maior interação entre água e sedimento possibilitando aporte de indivíduos da região bentônica. Considerando a ocorrência dos táxons ao longo do estudo, somente P. confirma foi considerada frequente, estando presente em mais de 50% das amostras analisadas. PALAVRAS-CHAVE: águas pretas, diatomáceas, plâncton, região amazônica Pinnularia (Bacillariophyta) from the lower course of Negro river (Amazon, Brazil): taxonomy and temporal distribution ABSTRACTThis study reports the taxonomy and temporal distribution of the Pinnularia genus occurring in the lower course Negro river (03º02'46,5"S e 60º15'13,1"W) along an annual cycle. Samples were collected in the water column monthly, from October 2002 to September 2003. The species were described and commented based on their morphology and morphometry. Eleven species and four varieties are registered, illustrated and incorporated in a taxonomic key. P. sterrenburgii var. sterrenburgii Metzeltin & Lange-Bertalot and P. subgibba var. capitata Metzeltin & Krammer are the first references to Negro river. Temporally, the highest species richness occurred from October and December 2002, low water period, when happened more interaction between water and sediment, and the contribution of the benthos individuals. On base in taxa occurrence during this study, only P. confirma was frequently, with occurrence in more than 50% of sample analyzed.

The genus Pinnularia (Bacillariophyta, Pinnulariaceae) from Lago dos Tigres, Britânia, Goiás, Brazil

“…These specimens presented similar outlines compared to the Metzeltin & Lange-Bertalot's (1998, 2007 material. Although the P. perumbrosa sensu Pereira et al (2012) was larger than the type population, this agreed with those specimens illustrated by Metzeltin & Lange-Bertalot (2007).…”

Pinnularia caprichosa sp. nov.: a diatom from a black water Brazilian Amazon system

“…Pinnularia is a benthic genus (Round et al 1990) and its presence in the plankton is unusual (Pereira et al 2012). The new species has not been observed during rising and high water periods.…”

“…is one of the richest genera in the Brazilian Amazon, and to date 49 species have already been discovered in a wide range of aquatic environments such as rivers, lakes and 'igarapés' (narrow and not very deep water streams inside the tropical forest), as recorded by Hustedt (1965), Metzeltin & Lange-Bertalot (1998, 2007 and Pereira et al (2012Pereira et al ( , 2013Pereira et al ( , 2014. The current report is the third in a series of contributions to the knowledge of the genus Pinnularia from Tupé Lake.…”

Four new Pinnularia Ehrenberg (Bacillariophyta, Pinnulariaceae) species from Amazonian black water (Tupé Lake, Amazonas State, Brazil)

“…Currently, a total of 127 taxa in Pinnularia are recorded from the lakes, rivers and 'igarapés' in the Amazonian region ( Table 1). The first records were published in taxon lists and were eventually illustrated by Uherkovich (1976Uherkovich ( , 1981, Uherkovich & Rai (1979), Uherkovich & Franken (1980), Melo et al (2004Melo et al ( , 2005, Aprile & Mera (2007) and Raupp et al (2009); few studies presented descriptions and comments (Hustedt 1965, Fukushima & Xavier 1988, Díaz-Castro et al 2003, Metzeltin & Lange-Bertalot 1998, and Pereira et al 2012.…”