title: [Phytoplankton from Tehuantepec River, Oaxaca, Mexico and some biogeographical relationships].
abstract: Phytoplankton species collected from the limnetic to euryhaline sections of Tehuantepec River were identified, classified and compared with regional information from Mexico and South America. We collected 15 samples every three months from July 1997 through August 1998 with a 20 microm net and a Van Dorn bottle. Indicator values and a code checklist are included. A total of 58 families, 121 genera, 273 species, one subspecies, 75 varieties, 13 forms and one morphotype were identified in the taxa Bacillariophyta (42.0 %), Chlorophyta (29.0 %), Cyanoprocaryota (18.0 %), Euglenophyta (5.0 %), Dinophyta (3.0 %), Cryptophyta (2.0 %) and Chrysophyta (1.0 %). The predominant families were Scenedesmaceae (24 species), Oocystaceae (22), Bacillariophyceae (21), Chaetocerotaceae (15) and Euglenaceae (14). Five families, eight genera, 72 species, 45 varieties and eight forms are first records for Mexico. The species Chroococcus turgidus, Microcystis flosaquae and Pseudanabaena limnetica (which produce massive blooms or red tides) are important in this river of moderate water quality.
authors.affiliation: Universidad Autónoma Metropolitana-Iztapalapa, México DF, México. jlmr64@yahoo.com
authors.forename: José L
authors.initials: JL
authors.lastname: Moreno-Ruiz
authors.forename: Margarito
authors.initials: M
authors.lastname: Tapia-García
authors.forename: Ma Del Carmen
authors.initials: Mdel C
authors.lastname: González-Macias
authors.forename: Ma Guadalupe
authors.initials: MG
authors.lastname: Figueroa-Torres
mesh_terms: D000818:Animals; D044822:Biodiversity; D017753:Ecosystem; D004784:Environmental Monitoring; D005843:Geography; D008800:Mexico; D010839:Phytoplankton / Q000145:classification*; D045483:Rivers; D012621:Seasons