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| Registros recuperados: 10 | |
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| Krupek,Rogério Antonio; Branco,Ciro Cesar Zanini; Peres,Cleto Kaveski. |
| We examined the relationships between environmental variations in lotic ecosystems with the seasonal dynamics of macroalgae communities at different spatial scales: drainage basin of two rivers (Rio das Pedras and Rio Marrecas), shading (open and shaded stream segments), mesohabitat (riffles and pools), and microhabitats. Data collections were made on a monthly basis between January and December/2007. A total of 16 taxa were encountered (13 species and 3 vegetative groups). All of the biotic parameters (richness, abundance, diversity, equitability, and dominance) were found to be highly variable at all of the spatial scales evaluated. On the other hand, abiotic variables demonstrated differences only at mesohabitat (in terms of current velocity) and shaded... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heterogeneity; Macroalgae; Seasonal variations; Stream. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300004 |
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| Krupek,Rogério Antonio; Branco,Ciro Cesar Zanini. |
| We examined the ecological distribution of macroalgal communities in streams using species groups (taxonomic units = algal phyla, and morphological = morphological types) with similar structures and functions instead of the species themselves. The study was conducted from June to July/2007 in two drainage basins located in mid-southern region of Paraná State , Brazil. Evaluations of macroalgal communities took into consideration the following spatial scales: the drainage basin (the Pedras river and Marrecas river basins), shading regime (open and shaded stream segments), mesohabitats (riffles and pools), and microhabitats (sampling units of 0.05m2). A total of 29 taxa (23 subgeneric, one generic, and five vegetative groups) were identified. On these, 12... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distribution; Functional group; Macroalgae; Stream. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300006 |
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| Tonetto,Aurélio Fajar; Peres,Cleto Kaveski; Hirata,Rafael Taminato; Branco,Ciro Cesar Zanini. |
| Spatial and temporal distribution of stream macroalgae in streams from southeastern Brazil were assessed for one year. The fluctuations in macroalgal species composition and environmental factors were monitored monthly. The region exhibit a tropical climate, with defined rainy and dry seasons. Nineteen species were found, with a predominance of Chlorophyta (52.7% of the species), followed by Cyanobacteria (26.3%), Ochrophyta and Rhodophyta (10.5% each). Scytonema arcangeli had the highest number of records (63.6%), while Mougeotia capucina occurred in all sampling sites. Community structure had low similarity (20-26%) and the environmental factors showed a weak contribution to the distribution pattern observed. Despite this, the light availability at the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Species distribution; Spatial variation; Temporal dynamics; Stream macroalgae; Rarity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000400102 |
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| Branco,Ciro Cesar Zanini; Riolfi,Thais Antunes; Peres,Cleto Kaveski; Necchi Júnior,Orlando. |
| Espécies de Rhodophyta de 10 Unidades de Conservação da região Sul do Brasil foram investigadas. As amostragens foram conduzidas em 105 segmentos de riachos consistindo em transeções de 10 m de comprimento. O levantamento florístico resultou em 80 populações representando três gêneros, Batrachospermum, Kumanoa e Hildenbrandia, além do estágios 'Chantransia'. Batrachospermum foi representado por cinco espécies (B. arcuatum Kylin, B. atrum (Hudson) Harvey, B. helminthosum Bory, B. keratophytum Bory, B. puiggarianum Grunow in Wittrock & Nordstedt). O gênero Kumanoa foi representado por K. abilii (Reis) Necchi Júnior & Vis e K. ambigua (Montagne) Entwisle et al., enquanto Hildenbrandia exclusivamente por H. angolensis W. West & G.S.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algas vermelhas; Levantamento taxonômico; Ecossistemas lóticos; Região subtropical; Kumanoa. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000300029 |
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| Branco,Ciro Cesar Zanini; Krupek,Rogério Antônio; Peres,Cleto Kaveski. |
| Twenty-two stream segments, representing the diverse types of environments in the mid-western region of the Paraná State, southern Brazil, were sampled for occurrence of macroalgal communities from May to October in 2002. Twenty-seven macroalgal taxa were found, with Chlorophyta as the dominant algal group, followed by Cyanobacteria, Rhodophyta and Chrysophyta. The most widespread species was Phormidium retzii. Distribution was patchy, with species number per sampling sites ranging from zero to six and correlated positively with the abundance. On the other hand, no significant correlation was found among the species number and abundance with environmental variables. Results indicated wide and random variation among the streams. Thus, it seemed that the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Local-scale variation; Paraná State; Stream macroalgae; Restricted distribution; Brazil. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200015 |
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| Registros recuperados: 10 | |
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