Vertical Distribution of Bacterial Communities in the Indian Ocean as Revealed by Analyses of 16S rRNA and nasA Genes

Abstract

Bacteria play an important role in the marine biogeochemical cycles. However, research on the bacterial community structure of the Indian Ocean is scarce, particularly within the vertical dimension. In this study, we investigated the bacterial diversity of the pelagic, mesopelagic and bathypelagic zones of the southwestern Indian Ocean (50.46°E, 37.71°S). The clone libraries constructed by 16S rRNA gene sequence revealed that most phylotypes retrieved from the Indian Ocean were highly divergent from those retrieved from other oceans. Vertical differences were observed based on the analysis of natural bacterial community populations derived from the 16S rRNA gene sequences. Based on the analysis of the nasA gene sequences from GenBank database, a pair of general primers was developed and used to amplify the bacterial nitrate-assimilating populations. Environmental factors play an important role in mediating the bacterial communities in the Indian Ocean revealed by canonical correlation analysis.

Oricola thermophila sp. nov., a marine bacterium isolated from tidal flat sediment and emended description of the genus Oricola Hameed et al. 2015

“…Bacteria affiliated with the genus Oricola have been reported from diverse environments such as coastal seawater and sediments ( Fig. S1, available in the online version of this article) [1][2][3][4], freshwater sediments (KX809757), marine organisms such as sea anemone [5], microalgae (MF289171, KT720455) and seaweeds [6,7], a microbial mat in a hydrothermal vent area [8], terrestrial wetland [9], etc. Members affiliated with the closely related genus Oceaniradius have also been reported from micro-or macro-algae [10][11][12][13].…”

Efeito do uso do solo ao longo do tempo em comunidades microbianas do ciclo do nitrogênio em solos tropicais

“…Os micro-organismos estão presentes nos mais variados ambientes em nosso planeta e são capazes de sobreviver em condições ambientais extremas como, por exemplo, no fundo de oceanos, fontes termais e até mesmo cavernas vulcânicas (JIANG;JIAO, 2016;McCLIMENT et al, 2006;HATHAWAY et al, 2014). Os micro-organismos podem ainda viver dentro de outros organismos como, por exemplo, o intestino de mamíferos e insetos (ECKBURG et al, 2005;DILLON;DILLON, 2004), em associação com plantas através de nódulos (JONES et al, 2007) ou ainda em superfícies de raízes e no próprio solo (TATE, 2017).…”