Diversidade específica e de hábitat dos Cosmarium de parede lisa (Zygnemaphyceae) do estado de São Paulo
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2006-11-17
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Araújo, Andréa de [UNESP]
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Universidade Estadual Paulista (Unesp)
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Cosmarium Corda ex Ralfs é, com cerca de 1.500 espécies, o gênero que apresenta a maior diversidade específica entre as desmídias e todas as algas de águas continentais. O atual inventário florístico abrangeu as formas do gênero que possuem parede celular lisa e considerou todas as referências feitas em literatura até o presente para o estado de São Paulo e foi complementado pela análise do material depositado no Herbário Científico do Estado Maria Eneyda P. Kauffmann Fidalgo (SP) e, inclusive, daquele coletado a partir de 2002 durante o desenvolvimento do Projeto Flora ficológica do estado de São Paulo (Programa BIOTA/FAPESP, Instituto Virtual de Biodiversidade). Foram identificados 64 táxons de níveis infragenéricos classificados em 38 espécies, 21 variedades que não são as típicas de suas respectivas espécies e cinco formas taxonômicas igualmente não típicas, porém, de suas respectivas variedades. A identificação dos 64 táxons foi feita com base em características, unicamente, da vida vegetativa. Tais características foram, principalmente, as dimensões do comprimento e da largura da célula e da largura do istmo, a forma das semicélulas, o número e a situação dos cloroplastos na célula e o número e a localização dos pirenóides no plasto. A espécie mais bem distribuída no estado foi C. angulosum Brébisson var. angulosum f. angulosum, que foi identificada de material proveniente de 12 municípios. Seguiu-a C. pyramidatum Brébisson var. pyramidatum identificada de material coletado em onze municípios. Constituem, neste trabalho, primeiras referências à ocorrência a de C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff para o Brasil e as de C. bioculatum Brébisson var. bioculatum, C. connatum (Brébisson) Ralfs var. connatum e C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff para o estado de São Paulo...
Cosmarium Corda ex Ralfs is, with about 1,500 species, the desmid genus that presents the greatest taxonomic diversity among the freshwater algae. Present floristic survey included all smooth-walled forms, and considered all references up to the present in the São Paulo State literature as well as the analysis of all material deposited in the Herbário Científico do Estado Maria Eneyda P. Kauffmann Fidalgo (SP), including that collected from 2002 on during the development of the project Flora ficológica do estado de São Paulo (Program BIOTA/FAPESP, Virtual Institute of Biodiversity). Sixty-four taxa were identified distributed in 38 species, 21 varieties that are not the typical of their respective species, and five taxonomical formae that are not also typical, but of their respective varieties. Identification of the 64 taxa was made on the basis of characteristics exclusively of the vegetative part of their life cycle. Such characteristics were, mainly, the linear dimensions of the cell length and breadth and of the isthmus breadth, the shape of the semicells, the number and situation of the chloroplasts in the cell, and the number and location of the pyrenoids in the plastid. The best distributed species in the state was C. angulosum Brébisson var. angulosum f. angulosum, which was identified from material gathered from 12 different municipalities. It was followed by C. pyramidatum Brébisson var. pyramidatum that was identified from material gathered from eleven municipalities. Identification of C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff is pioneer for Brazil, and those of C. bioculatum Brébisson var. bioculatum, C. connatum (Brébisson) Ralfs var. connatum, and C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff are pioneer for the state of São Paulo. Despite of indication of vegetative reproduction by cell division be relatively... (Complete abstract, click electronic address below)
Cosmarium Corda ex Ralfs is, with about 1,500 species, the desmid genus that presents the greatest taxonomic diversity among the freshwater algae. Present floristic survey included all smooth-walled forms, and considered all references up to the present in the São Paulo State literature as well as the analysis of all material deposited in the Herbário Científico do Estado Maria Eneyda P. Kauffmann Fidalgo (SP), including that collected from 2002 on during the development of the project Flora ficológica do estado de São Paulo (Program BIOTA/FAPESP, Virtual Institute of Biodiversity). Sixty-four taxa were identified distributed in 38 species, 21 varieties that are not the typical of their respective species, and five taxonomical formae that are not also typical, but of their respective varieties. Identification of the 64 taxa was made on the basis of characteristics exclusively of the vegetative part of their life cycle. Such characteristics were, mainly, the linear dimensions of the cell length and breadth and of the isthmus breadth, the shape of the semicells, the number and situation of the chloroplasts in the cell, and the number and location of the pyrenoids in the plastid. The best distributed species in the state was C. angulosum Brébisson var. angulosum f. angulosum, which was identified from material gathered from 12 different municipalities. It was followed by C. pyramidatum Brébisson var. pyramidatum that was identified from material gathered from eleven municipalities. Identification of C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff is pioneer for Brazil, and those of C. bioculatum Brébisson var. bioculatum, C. connatum (Brébisson) Ralfs var. connatum, and C. impressulum Elfving var. crenulatum (Nägeli) Krieger & Gerloff are pioneer for the state of São Paulo. Despite of indication of vegetative reproduction by cell division be relatively... (Complete abstract, click electronic address below)
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Alga, Taxonomia, desmídias
Como citar
ARAÚJO, Andréa de. Diversidade específica e de hábitat dos Cosmarium de parede lisa (Zygnemaphyceae) do estado de São Paulo. 2006. vii, 150 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2006.