Las cianofitas dominaron durante todo el periodo de estudio, con una contribución mayor al 80% de la abundancia total del fitoplancton. Son nuevos registros para México l3 especies:
am .m x.Resumen. La flora alga! de tres localidades de l río La Magdale na, está co nstituida por 72 espec ies co n las siguientes proporciones: 63 Bacillariophyceae, seis Cyanop hyceae, una Ch lorop hyceae, una Ulvo ph yceae y una Charop hyceae. Se describe n las es pec ies e ilustran con fotografías, se incluye n datos a mbi e nta les y referencias para Méx ico. Se e ncontraron 11 nu evos reg ist ros pa ra la flora alga! del pa ís. Palabras clave: a lgas, ríos d e montaii.a, Ciudad de Méx ico . Abstract. The result of the phycofloristic study of three places from La Magda le na's rive r we re 72 a lga! species with the next proportions: 63 Bacillariophyceae, six Cyanop hyceae, one Ch lorop hyceae, o ne U lvop h yceae and one Charophyceae . Is presented a brief description of the species, includ ing environrnental characteristics a nd photographs. Eleven new registers to the co untry are reponed.
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