Diatoms from the Colombian and Peruvian Amazon: the Genera Encyonema, Encyonopsis and Gomphonema (Cymbellales: Bacillariophyceae)

Abstract

Diatoms from the Colombian and Peruvian Amazon: the Genera Encyonema, Encyonopsis and Gomphonema (Cymbellales, Bacillariophyceae). The diatom flora of the Colombian and Peruvian Amazon is far less studied than the flora of the Brazilian sector of the basin. Here we present results related to the genera Encyonema, Encyonopsis and Gomphonema. Plankton and periphyton samples were collected in lotic and lentic waterbodies from the Amazonian-Andean region, the Amazon River, Japurá River and Porvenir River basins during 1993, 1994, 2001 and 2003. At each sampling station pH, temperature, water transparency and conductivity were registered. Samples were analyzed with phase contrast microscope (LM) and scanning electron microscope (SEM). Ten taxa are new records for the area; Encyonema for the Peruvian and Colombian Amazon and Encyonopsis for the Colombian Sector. Encyonema neogracile var. tenuipunctatum, E. vulgare, Encyonopsis frequentis, Gomphonema augur var. sphaerophorum and G. contraturris are recorded for the first time in Colombia; Encyonema venezolanum and G. neoapiculatum in Colombia and Peru and the latter also for Amazonia. E. angustecapitatum was mentioned in Colombia before at a pond located at 3000m asl. We describe a new species from

Especies de Nupela (Naviculales: Bacillariophyceae) en aguas de tierras bajas de Colombia que incluyen a N. acaciensis nov. sp. y N. catatumbensis nov. sp.

“…Diatom studies conducted to date, showed that this group has high diversity the same as other groups of organisms and many new taxa for science have been recently described (Vouilloud, Sala, Núñez-Avellaneda, & Duque, 2010;MontoyaMoreno, Sala, Vouilloud & Aguirre, 2012).…”

Diversidad estacional de la clase bacillariophyceae en el río Utcubamba, Perú

“…Vouilloud et al, 2010;Sala et al, 2015), Bolivia (e.g. Morales y Rivera, 2013;Morales et al, 2014), o en el mismo Perú (e.g.…”

Kurtkrammeria, a new genus of freshwater diatoms (Bacillariophyta, Cymbellaceae) separated from Encyonopsis

“…Kurtkrammeria frequentis is known from various black water rivers and laguna in the Amazon region of South America (Krammer 1997b, Metzeltin & Lange-Bertalot 1998, Vouilloud et al 2010) and as a fossil in Ehrenberg material from Cayenne, Guyana, where it was reported as Cymbella aequalis (Reichardt 1995 Kurtkrammeria species are reported infrequently, primarily from mountainous regions, and consistently from oligotrophic or dystrophic waters with circumneutral pH and very low dissolved solids. Vouilloud et al (2010) report K. frequentis from rivers with pH values ranging from 5.1 to 6.3, conductivity of 10-16 µScm -1 , and low chlorophyll a content. These rivers are in a remote, undeveloped, and seldom visited area of the Amazon Basin.…”