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Análise Qualitativa Estacional Da Fauna De Moluscos Límnicos No Delta Do Jacuí, Rio Grande Do Sul, Brasil
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pfeifer, Nádia Teresinha Schröder Pitoni, Vera Lúcia Lopes |
| Copyright Year | 2003 |
| Abstract | Neste estudo investiga-se a malacofauna associada as raizes de Eichhornia azurea (Sw.) Kunth e de Eichhornia crassipes (Mart.) Solms-Laub. e ao sedimento superficial de fundo nas aguas do Parque Estadual Delta do Jacui (29o53’ e 30o03’S e 51o28’ e 51o13’O), RS, atraves de levantamento quantitativo sazonal, realizado do outono de 1998 ao outono de 2000, em tres estacoes (Saco das Garcas – E1, do Quilombo – E2, CP1 – E3). Em cada estacao de coleta foram amostrados tres pontos, nas margens esquerda, direita e no interior do respectivo saco, observando-se sua entrada. Identificam-se as especies, dominâncias e seus substratos preferenciais. Na estrutura da comunidade verifica-se maior ocorrencia de gastropodes em relacao aos bivalves e predominância de individuos jovens em ambos os grupos. As especies de Gastropoda Heleobia bertoniana (Pilsbry, 1911) e Bivalvia Eupera klappenbachi Mansur e Veitenheimer, 1975 sao as dominantes, respectivamente. Conclui-se ser E. azurea bentonica o substrato preferencial para os moluscos, onde se registram maior abundância e riqueza de especies. Na estacao E2 registram-se a maior frequencia, abundância e riqueza de especies. Palavras-chave: moluscos limnicos, Eichhornia azurea , E. crassipes , sedimento, delta do Jacui, RS. ABSTRACT Seasonal qualitative analysis of limnical mollusc fauna in delta do Jacui, Rio Grande do Sul, Brazil. In this study the mollusks associated to the roots of Eichhornia azurea (Sw.) Kunth is investigated and of Eichhornia crassipes (Mart.) Solms-Laub. and to the superficial sediment of bottom in the waters of the State Park “Delta do Jacui” (29o53’ and 30o03’ S and 51o28’ and 51o13’ W), Rio Grande do Sul, through seasonal quantitative survey, accomplished from autumn of 1998 to autumn of 2000, in three stations (basin das Garcas – E1, Quilombo – E2, CP1 – E3). In each station three points were sampled, in the left margin, right and inside the respective basin being their entrance observed. The species, places where they live and their preferential substrata are identified. Larger occurrence of gastropods is verified in the community’s structure in relation to the bivalve ones and young individuals’ predominance in both groups. Gastropoda: Heleobia bertoniana (Pilsbry, 1911) and Bivalvia: Eupera klappenbachi Mansur e Veitenheimer, 1975 were the dominant, respectively. It is concluded to be E. azurea bentonica the preferential substratum for the mollusks, where it is enrolled larger abundance and wealth of species. In the station E2 the largest frequency, abundance and wealth of species are noted. Key words: freshwater mollusks, Eichhornia azurea , E. crassipes , sediment, delta of Jacui, Rio Grande do Sul. |
| File Format | PDF HTM / HTML |
| Volume Number | 11 |
| Alternate Webpage(s) | http://revistaseletronicas.pucrs.br/ojs/index.php/fabio/article/download/140/129 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
