Abstract

MORA, Demetrio; CARMONA, Javier  and  CANTORAL-URIZA, Enrique A.. Epilithic diatoms in the Upper Laja River Basin, Guanajuato, Mexico. Rev. Mex. Biodiv. [online]. 2015, vol.86, n.4, pp.1024-1040. ISSN 2007-8706.  https://doi.org/10.1016/j.rmb.2015.09.004.

This study investigates the epilithic diatoms from the Dolores and Laja Rivers, located within the Upper Laja River Basin, Guanajuato, Mexico. The samples were collected during the cold-dry (January) and rainy (October) seasons of 2011. One-hundred seventy three infrageneric taxa were identified, 7 of which are new records for Mexico: Fallacia monoculata , Hantzschia abundans , Navigiolum uruguayense , Neidium bisulcatum , Nitzschia solita , Planothidium incuriatum and Sellaphora bacilloides; it is worth mentioning that Navigiolum is a new record at the genus level. Furthermore, 3 species are new records for the state of Guanajuato: Gomphonema laticollum , G.subclavatum and Gomphosphenia lingulatiformis. Teratological forms of 6 species were also found in the sampling sites with higher nutrient concentrations, with relative abundances varying from 0.8 to 8.3%.

Keywords : Benthos; Bacillaryophyta; New records; Temporary environments; Streams.