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- Title
Acanthoceras and Urosolenia species (Diatomeae) in subtropical reservoirs from South Brazil: Ultrastructure, distribution and autoecology.
- Authors
Tremarin, Priscila Izabel; Freire, Eduardo Gomes; Algarte, Vanessa Majewski; Ludwig, Thelma Veiga
- Abstract
Acanthoceras Honigmann and Urosolenia Round & Crawford emend. Rott, Kling & McGregor species were studied based on samples of 19 hydroelectric power plants reservoirs located in the State of Paraná, Southern Brazil. Autoecological informations of Urosolenia species complement the study. One Acanthoceras and four Urosolenia species were identified: A. zachariasii (Brun) Simonsen, U. amazonica Sala, Núñ ez-Avellaneda & Vouilloud, U. eriensis var. morsa (West & G.S.West) Bukhtiyarova, U. longiseta Zacharias and U. obesa Freire, Tremarin & Ludwig. Morphological variation of frustules was described and illustrated by optical and scanning electron microscopy, and compared with similar species such as U. delicatissima Sala, Núñ ez-Avellaneda & Vouilloud and U. eriensis var. eriensis (H.L.Smith) Round & Crawford. The pioneer record of U. amazonica to Brazil and unprecedent details of the ultrastructure of A. zachariasii and U. longiseta are included in this study. Cellular densities differed among evaluated reservoirs showing strong correlations with inorganic nitrogen concentrations, N/P ratio and temperature. The results suggested higher densities in periods of warmer temperatures and low availability of the nitrogen compounds and confirmed that species respond strongly to local environmental gradients.
- Subjects
BRAZIL; PHYTOPLANKTON; RESERVOIRS; TAXONOMY; SCANNING electron microscopy; PRINCIPAL components analysis
- Publication
Biota Neotropica (Edicao em Iingles), 2015, p1
- ISSN
1806-129X
- Publication type
Article
- DOI
10.1590/1676-06032014004314