Type analysis of Achnanthidium minutissimum and A. catenatum and description of A. tropicocatenatum sp nov (Bacillariophyta), a common species in Brazilian reservoirs

Autor(es)

Marquardt, Gisele C. ^[1] ; Costa, Livia F. ^[1] ; Bicudo, Denise C. ^[1] ; Bicudo, Carlos E. de M. ^[1] ; Blanco, Saul ^{[2, 3]} ; Wetzel, Carlos E. ^[4] ; Ector, Luc ^[4]

Afiliação do(s) autor(es)

^[1] Inst Bot, Ecol Dept, Av Miguel Estefano 3687, BR-04301012 Sao Paulo, SP - Brazil

^[2] Univ Leon, Biodivers & Environm Management Dept, E-24071 Leon - Spain

^[3] Inst Environm, La Serna 58, Leon 24007 - Spain

^[4] LIST, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux - Luxembourg

• Tipo de documento: Artigo Científico
• Fonte: PLANT ECOLOGY AND EVOLUTION; v. 150, n. 3, p. 313-330, NOV 2017.
• Citações Web of Science: 6

Resumo

Background and aims - A commonly occurring Achnanthidium species has been observed in Brazilian reservoirs. The morphological features were described based on light and scanning electron microscope observations and it is described here as A. tropicocatenatum sp. nov. Methods - The new species was compared with the type material of morphologically similar taxa: Achnanthidium catenatum and A. minutissimum. Comparisons with the most related species based on literature were also provided. Traditional weighted-averaging approaches (WA) were applied to model ecological optima. Key results - Morphometric analysis of the valve shape supported the taxa separation; they can be easily differentiated by the morphological and ultrastructural features, including subcapitate to capitate apices, strongly radiate striae and a prominent axial area. This new species has been found in alkaline waters with low electrolyte content. Conclusions - Records of A. catenatum in Brazil are considered questionable because the species may have been confused with A. tropicocatenatum sp. nov. (AU)

• Processo FAPESP: 13/10314-2 - Comparação da biodiversidade e distribuição das diatomáceas planctônicas, perifíticas e de sedimentos superficiais em seis reservatórios no sul do estado de São Paulo
• Beneficiário: Gisele Carolina Marquardt
• 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