Benthic diatoms on fluvial tufas of the Mesa River, Iberian Range, Spain

  • Hugo Beraldi-Campesi Instituto de Geología, Universidad Nacional Autónoma de México. Ciudad Universitaria, CDMX, 04510. México
  • Concepcion Arenas-Abad Departamento de Ciencias de la Tierra. Universidad de Zaragoza. Zaragoza, E50009. España
  • Luis Auque-Sanz Departamento de Ciencias de la Tierra. Universidad de Zaragoza. Zaragoza, E50009. España
  • Marta Vázquez-Urbez Departamento de Ciencias de la Tierra. Universidad de Zaragoza. Zaragoza, E50009. España
  • Gonzalo Pardo-Tirapu Departamento de Ciencias de la Tierra. Universidad de Zaragoza. Zaragoza, E50009. España
Palabras clave: Benthic diatoms, freshwater tufas, Iberian Range, Spain.

Resumen

Background. The Mesa River (MR) in the Iberian Range (Spain) displays prominent, Pleistocene to present-day fluvial
tufa deposits. Little of their associated microbiota has been studied to date despite the regional and historical relevance
of these calcareous buildups. Goals. This paper is a preliminary exploration of the diatom (Bacillariophyta) genera
associated with actively-growing tufa from 10 benthic environments along 24 km of the Mesa River. Methods. Brightfield
microscopy, as well as consultation with specialists and specialized literature was used for taxonomic classification
of diatoms. Results. We identified 25 diatom genera in three different types of sedimentary facies (porous and
moss-algae rich, dense-laminated, and tufa-free gravel). Most diatoms were raphid pennate (class Bacillariophyceae),
while a few were centric (class Coscinodiscophyceae) or araphid pennate (class Fragilariophyceae). They appeared as
integral components of the tufa structure along with cyanobacteria and other algae and mosses. Conclusions. Together
with previous studies on the hydrochemistry and sedimentology of the MR, our interpretations suggest that HCO3
-,pCO2, Ca2+, and TDIC negatively affect diatom richness and that their abundance is positively related to the presence
of mosses and algae.

Descargas

La descarga de datos todavía no está disponible.
Cómo citar
Beraldi-Campesi, H., Arenas-Abad, C., Auque-Sanz, L., Vázquez-Urbez, M., & Pardo-Tirapu, G. (1). Benthic diatoms on fluvial tufas of the Mesa River, Iberian Range, Spain. HIDROBIOLÓGICA, 26(2), 283-297. https://doi.org/10.24275/uam/izt/dcbs/hidro/2016v26n2/Beraldi
Sección
Artículos