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| Fagundes,Camila K.; Behr,Everton R.; Kotzian,Carla B.. |
| The diet of the benthic-feeding fish Iheringichthys labrosus (Lütken, 1874) was analyzed. Samples were taken bimonthly from December 1999 to January 2002, in three sites of the Ibicuí River, a tributary of Uruguay River basin (Rio Grande do Sul, Brazil). In each sampling point the specimens were collected in lentic and lotic environments. Gillnets and trammel nets were examined every 6 hours (6h, 12h, 18h and 24h). Diet description was based on the frequency of occurrence and the volume of each food item to obtain the Alimentary Index (IAi). The average stomach fullness was adopted to detect variations in the feeding activity according to the season, the circadian rhythm and the environment. Chironomids were the most important food item, followed by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feeding activity; Chironomidae; Rio Grande do Sul. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000100008 |
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| Spies,Marcia R.; Froehlich,Claudio G.; Kotzian,Carla B.. |
| The taxonomic composition and diversity of Trichoptera larvae communities were studied in four lotic sites in central region of State of Rio Grande do Sul. Sampling was done monthly from June, 2001 to May, 2002 in four sites located at the middle section of Jacuí River (Point 4) and in three tributaries (Carijinho River - Point 1; Lajeado da Gringa - Point 2 and Lajeado do Gringo - Point 3), with a Surber sampler. The total number of larvae collected was 29,143, belonging to 25 genera distributed in nine families; twenty of these genera are new records for the State. The highest abundance was found at Point 2 (n = 12,547). The highest standardized richness, for a 1,177 specimens sample chosen by chance, was recorded at Point 1, followed by Point 4 (17.7... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Faunistic composition; Larvae assemblage; Caddisflies; Physical features; State of Rio Grande do Sul. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212006000400001 |
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| Siegloch,Ana Emilia; Froehlich,Claudio Gilberto; Kotzian,Carla B.. |
| The taxonomic composition and diversity of assemblages of Ephemeroptera nymphs of four lotic environments in the central region of State of Rio Grande do Sul, a subtropical area in southern Brazil, were evaluated. Samplings were done monthly, with a Surber sampler, from June 2001 to May 2002, in the Jacuí River and three of its tributaries. The total number of nymphs collected in the four sampling sites was 11,007 in five families and 19 genera, of these, 11 are new records for the State. The highest diversity occurred in Point 4 (H'=2.41) and the lowest in Point 2 (H'=1.69). Point 4 had the highest environmental stability, conservation of the riparian vegetation and the lowest anthropic impact, while Point 2 presented a large environmental simplification... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ephemeroptera; Nymphs; Taxonomic composition; Diversity; Southern Brazil. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400002 |
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| Neri,Damaris B.; Kotzian,Carla B.; Siegloch,Ana Emília. |
| Neste estudo, foi analisada a composição dos Heteroptera do curso médio da bacia do rio Jacuí, RS, Brasil, previamente à construção da U.H.E. Dona Francisca, bem como alguns fatores abióticos que poderiam afetar a distribuição e a abundância destes organismos. Nos ambientes lênticos, amostragens quantitativas foram realizadas utilizando-se peneiras, em seis localidades (janeiro 2000). Nos ambientes lóticos, as coletas foram feitas através de amostrador de Surber (de maio a outubro de 2000), privilegiando-se a captura de espécies tipicamente bentônicas. Em cada estação, pH, oxigênio dissolvido, precipitação mensal, temperatura do ar e da água e profundidade foram medidos. Nos rios e riachos, a velocidade da corrente também foi registrada. Quinze espécies... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fatores abióticos; Insetos aquáticos; Usina hidrelétrica; Macroinvertebrados; Rio Grande do Sul. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212005000400013 |
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| Ayres-Peres,Luciane; Sokolowicz,Carolina C.; Kotzian,Carla B.; Rieger,Paulo J.; Santos,Sandro. |
| O presente estudo teve como objetivo caracterizar a ocupação de conchas por ermitões no litoral da cidade de Rio Grande, Estado do Rio Grande do Sul. Os animais foram amostrados em 14 radiais em Rio Grande, entre 12 e 50 metros de profundidade. Cada ermitão e sua respectiva concha foram identificados, pesados e medidos. Um total de 408 animais foi capturado, pertencentes às famílias Diogenidae e Paguridae; as duas espécies mais abundantes foram Dardanus insignis (de Saussure, 1858) e Loxopagurus loxochelis (Moreira, 1901). Os ermitões ocuparam conchas de 13 espécies de gastrópodes, principalmente de Buccinanops lamarckii (Kiener, 1834) e B. gradatum (Deshayes, 1844). Dardanus insignis utilizou 12 das 13 espécies de moluscos registradas; Loxopagurus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Preferência de conchas; Dardanus insignis; Loxopagurus loxochelis; Costa sul do Brasil. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000200009 |
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