Micrasterias C. Agardh ex Ralfs (Zygnematophyceae) de duas Áreas de Proteção Ambiental da planície litorânea do norte da Bahia, Brasil

Abstract

(Micrasterias C. Agardh ex Ralfs (Zygnematophyceae) of two Environment Protection Areas of the northern littoral lowland of Bahia, Brazil). Taxonomical survey of genus Micrasterias C. Agardh ex Ralfs of two Environment Protection Areas (APA Rio Capivara and APA Lagoas de Guarajuba), both located in the Camaçari, Bahia State, northeastern Brazil. Ninety-six samples of planktonic and periphytic material studied was collected during the Summer, both in lotic and lentic environments. Fourteen taxa were identified, from which M. americana (Ehrenb.) Ralfs var. bahiensis I. B. Oliveira, C. E. M. Bicudo & C. W. N. Moura is described and proposed as new to Science, and 10 constitute pioneer citations for the state of Bahia desmidflora, namely, M. alata G. C. Wall., M. arcuata Bailey var. subpinnatifida West & G. S. West f. subpinnatifida, M. borgei H. Krieg. var. borgei, M. foliacea Bailey ex Ralfs var. foliacea, M. furcata C. Agardh ex Ralfs var. furcata f. furcata, M. laticeps Nordst. var. laticeps, M. laticeps Nordst. var. acuminata H. Krieg., M. mahabuleshwarensis J. Hobson var. ampullacea (W. M. Maskell) Nordst., M. mahabuleshwarensis J. Hobson var. mahabuleshwarensis f. mahabuleshwarensis, M. pinnatifida (Kütz.) Ralfs var. pinnatifida f. pinnatifida, M. radiosa Ralfs var. elegantior (G. S. West) Croasdale, M. rotata (Grev.) Ralfs var. rotata and M. truncata (Corda) Bréb. ex Ralfs var. pusilla G. S. West. The best represented species in the study area were M. pinnatifida and M. alata, present in 38.6% and 36.6% of studied samples, respectively. Micrasterias laticeps var. acuminata and M. americana var. bahiensis, were the least represented ones, since they occurred just in 2,08% and 1,04% respectively.