The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

Abstract

Tryblionella is a large epipelic genus, widespread from fresh to marine waters. Most of the studies including the genus are based only in light microscopy. Few recent studies are exclusively dedicated to Tryblionella and the ultrastructure of some species is still little known. In this paper we present eleven species of Tryblionella found in epiphyton and microphytobenthos in Patos Lagoon salt marshes. All the species are described, illustrated in light and scanning electron microscopy and comments about their taxonomy, distribution and ecology are provided. Two taxa are reported for the first time in the State of Rio Grande do Sul and one in Southern Brazil. The number of species registered in this study comprises nearly a half of the number of species registered in the country. The high richness observed may be related to the dynamics of the salt marshes, which provides both the mixing of fresh and marine waters communities and the diversity of microhabitats. The great variability among the species analyzed allowed to extend the general concept of Tryblionella, adding features which were not considered in the previous characterizations of the genus.

Diatom-based inference model for conductivity reconstructions in dryland river systems from north Patagonia, Argentina

“…Critical identifications were confirmed using a scanning electron microscope (SEM; Jeol JSM-6460 LV) operated at 15 kV. Each specimen was identified to the lowest taxonomic level according to Ayestarán and Sastre (1995), Bertolli et al (2020), Bey and Ector (2013), Echazú (2012), Jahn et al (2009), Krammer and Lange-Bertalot (1986), Krammer and Lange-Bertalot (1988), Lange-Bertalot (2001), Levkov (2009), Li et al (2018), Morales (2005), Morales et al (2019), Romero and Jahn (2013), Sar et al (2007), and Witkowski et al (2000). The online taxonomic catalogue DiatomBase (diatombase.org) was consulted to assess the validity status of the taxa.…”