Consulta: creatorFacets:"Philippsen,Juliana S."
Registros recuperados: 2
Data/hora: 08/06/2024 09:38:56

Genetic variability in four samples of Neoplecostomus yapo (Teleostei: Loricariidae) from the rio Paranapanema basin, Brazil
Provedor de dados: 83
Autores: Philippsen,Juliana S.; Renesto,Erasmo; Gealh,Ana Maria; Artoni,Roberto F.; Shibatta,Oscar A.; Zawadzki,Claudio H.
Four samples of Neoplecostomus yapo were analyzed through the allozyme electrophoresis technique in corn starch gel. The allozyme pattern was similar to those found in N. paranensis with 24 loci scored. Two samples (ribeirão Atlântico and ribeirão Uraí) showed monomorphic bands for all 24 loci, whereas the other two (rio Verde and rio Fortaleza) showed 8.3% of polymorphic loci. The He genetic variability estimates for the rios Verde and Fortaleza populations were 0.0195 and 0.0179, respectively, too much inferior to the mean heterozygosity summed to species from the whole world (0.051). The Wright statistical values F IS = 0.5181, F IT = 0.5681 and F ST = 0.1039 and the genetic distance of Nei values showed that the four samples are genetically very...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allozymes; Genetic variation; Neoplecostominae; Neotropical fishes; Siluriformes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100004

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain
Provedor de dados: 42
Autores: Philippsen,Juliana S.; Hauser,Marília; Benedito,Evanilde.
This study investigated the isotopic niches of two fish species, one exotic and one native. It was hypothesized that these species would show little or no isotopic niche overlap. This hypothesis was tested with the isotopic niche concept and the trophic Layman's metrics. A considerable isotopic niche overlap was observed between the species, mainly for the exotic that showed the greater percentage of overlapping, indicating an interspecific competition for food resources. Layman's metrics also showed this species probably exploits a more specific array of food resources when compared with the native species. The native species probably has the ability to exploit a wider array of resources, highlighted by the higher values given for the Layman's metrics....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Hoplias sp1; Hoplias sp2; Layman's metrics; Trophic interactions.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200825