Two new diatoms in the genus Fragilaria Lyngbye (Fragilariophyceae) from tropical reservoirs in Brazil and comparison with type material of F. tenera

Autor(es)

Almeida, Pryscilla D. ^[1] ; Morales, Eduardo A. ^[2] ; Wetzel, Carlos E. ^[3] ; Ector, Luc ^[3] ; Bicudo, Denise C. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Bot, Dept Ecol, Ave Miguel Stefano 3687, BR-04301902 Sao Paulo, SP - Brazil

^[2] Univ Catolica Boliviana San Pablo, Herbario Criptogam, Calle M Marquez Esq Plaza Jorge Trigo S-N POB 538, Cochabamba - Bolivia

^[3] LIST, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux - Luxembourg

• Tipo de documento: Artigo Científico
• Fonte: PHYTOTAXA; v. 246, n. 3, p. 163-183, FEB 12 2016.
• Citações Web of Science: 8

Resumo

Two new diatom species, Fragilaria neotropica sp. nov. and F. spectra sp. nov., from six reservoirs with different trophic status in the Alto Tiete River Basin, Sao Paulo, Brazil, are described. Descriptions are based on light (LM) and scanning electron microscopy (SEM) data revealing that both taxa have distinctive features that separate them from each other and from other taxa currently in Fragilaria. Fragilaria neotropica has high stria density, broader (sometimes deformed) central area, and capitate (often deflected) apices. This species was found in high abundance as part of the phytoplankton, periphyton and surface sediments in mesotrophic reservoirs. On the other hand, F. spectra has indistinct striae (not clearly seen in LM), wide sternum, two rimoportulae per valve and lacks spines. This taxon was abundant in the phytoplankton and periphyton of oligotrophic to mesotrophic reservoirs. A discussion of morphological and ecological aspects in the light of available literature is presented, as well as a morphological comparison based on LM and SEM analysis of the original material of F. tenera. (AU)

• Processo FAPESP: 14/13179-1 - Diatomáceas penadas arrafídeas: taxonomia e ecologia de representantes dos gêneros Fragilaria, Fragilariforma, Synedra e Ulnaria no estado de São Paulo
• Beneficiário: Pryscilla Denise Almeida da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/53898-9 - Reconstrução paleolimnológica da Represa Guarapiranga e diagnóstico da qualidade atual da água e dos sedimentos de mananciais da RMSP com vistas ao gerenciamento do abastecimento
• Beneficiário: Carlos Eduardo de Mattos Bicudo
• Modalidade de apoio: Auxílio à Pesquisa - Temático