Diatom assemblage in a tropical lake of northeastern Brazil

Abstract

The composition and spatial variation of diatom assemblage in surface sediments of Caçó Lake (shallow, mesotrophic and weakly acid lake -Maranhão State, Brazil) were analyzed in order to know the distribution pattern of the species along the lake during rainy season (April 1999

Criptógamos do Parque Estadual das Fontes do Ipiranga, São Paulo, SP, Brasil. Algae 45: Bacillariophyceae (Naviculales: Brachysira)

“…No PEFI esse táxon foi encontrado, principalmente, nas amostras de material epifítico de ambientes caracterizados como rasos, com águas levemente ácidas e de concentração de nutrientes leve a moderada (Fernandes 2008). Brachysira brebissonii é comumente citada para as regiões sul (Schneck et al 2007, Tremarin et al 2009, Marra et al 2016, Faria et al 2019) e sudeste (Almeida & Bicudo 2014, Faustino et al 2016, Costa et al 2017, Bartozek et al 2018, com raros registros para as regiões centro-oeste (Silva et al 2011) e nordeste, na qual foi encontrada em amostras de sedimento superficial (Nascimento et al 2010) e testemunhos sedimentares (Viana et al 2014), para a região norte do Brasil não há registros deste táxon.…”

Protists and other organisms on a minute snail periostracum

“…Protists are among the most common components of plankton in water, benthos in aquatic habitats and edaphos on land, associated with illuminated and moisture milieus (Freckman et al, 1997;Palmer, 1997;Alekperov and Snegovaya, 1999;Audesirk et al, 2012); they participate in food webs (Bere and Tundisi, 2011;) and are used as indicators of climatic changes, eutrophication and acidification (Nascimento et al, 2010). They have been reported on rocks, trees, leaves, turtle carapace and inside the thallus of algal lichen (Lakatos et al, 2004; Wu and Bergey, 2017).…”