Epilithic diatoms (<em>Bacillariophyceae</em>) from running watersin NW Iberian Peninsula (Galicia, Spain)

Manel Leira; María del Carmen López-Rodríguez; Rafael Carballeira

doi:10.3989/ajbm.2421

Authors

Manel Leira Laboratório associado IDL, Faculdade de Ciencias, Universidade de Lisboa https://orcid.org/0000-0001-9024-9448
María del Carmen López-Rodríguez Department of Botany, Biology Faculty, University of Santiago de Compostela https://orcid.org/0000-0001-5814-1066
Rafael Carballeira Department of Botany, Biology Faculty, University of Santiago de Compostela https://orcid.org/0000-0002-2807-6942

DOI:

https://doi.org/10.3989/ajbm.2421

Keywords:

Bacillariophyceae, diatoms, Galicia, rivers, Spain, streams

Abstract

A catalog of Bacillariophyceae for the rivers of NW of Spain is made for the first time. It includes a re-examination of the taxa reported in previous publications, taxa cited during the last years of the rivers of the Galicia-Costa Hydrographic Demarcation, and a revision of the taxonomy, in line with the systematic and nomenclature changes, which have occurred mainly in recent years. The epilethic diatoms of the river basins of Galicia-Costa were sampled during the years 2005, 2006, and 2007, in May-June and September. The study was carried out in 41 localities distributed along 31 rivers, samples were taken in upstream and downstream sections. Diatom communities were compared in all upstream sections of these rivers draining from siliceous substrates. We identified 141 taxa of diatoms from the coast of Galicia. In this paper we present 15 new citations for Galicia, two for Spain and three for the Iberian Peninsula, in addition to a new species recently described. The dominant taxa are: Achnanthidium minutissimum, Achnanthes subhudsonis, Karayevia oblongella, Cocconeis placentula var. euglypta, Gomphonema rhombicum, and Navicula minima. Achnanthes subhudsonis was the most abundant species during the spring and summer months. The remaining species showed no relevant changes regardless of the time of year. The results indicate that the river diatoms of Galicia are an important component of the diversity of the ecosystem.

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