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ResumenSe presenta el registro de las diatomeas epilíticas de los ríos Dolores y Laja, localizados en la cuenca alta del río Laja, Guanajuato, México. Las muestras se recolectaron en las temporadas seca-fría (enero) y lluviosa (octubre) del 2011. Se identificaron 173 taxa infragenéricos, de los cuales 7 son nuevos registros para México: Fallacia monoculata, Hantzschia abundans, Navigiolum uruguayense, Neidium bisulcatum, Nitzschia solita, Planothidium incuriatum y Sellaphora bacilloides; cabe mencionar que Navigiolum es nuevo registro a nivel genérico. Además, 3 especies son nuevos registros para el estado de Guanajuato: Gomphonema laticollum, G.subclavatum y Gomphosphenia lingulatiformis. Se encontraron formas teratológicas en 6 especies con abundancias relativas que variaron de 0.8 a 8.3%, siendo estas formas más abundantes en los sitios con mayores concentraciones de nutrientes.AbstractThis 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%

Diatomeas epilíticas de la cuenca alta del río Laja, Guanajuato, México