Now showing items 1-10 of 168
Forensic identification of the guitarfish species Rhinobatos horkelli, R-percellens and Zapteryx brevirostris using multiplex-PCR
(Molecular Ecology Resources, 2010-01-01) [Resumo]
Rhinobatos percellens, Rhinobatos horkelli and Zapteryx brevirostris, known as guitarfish, are commonly found inshore and caught by trawl nets. Recently, these species have been suffering sharp population declines. One of ...
Identification of the shark species Rhizoprionodon lalandii and R-porosus (Elasmobranchii, Carcharhinidae) by multiplex PCR and PCR-RFLP techniques
(Molecular Ecology Resources, 2009-05-01) [Artigo]
Rhizoprionodon lalandii and R. porosus are widely distributed along the Atlantic coast of the Americas, living close to coastal areas and therefore frequently captured by seaboard fisheries. However, morphological ...
Biologia populacional de Astyanax altiparanae Garutti & Britski (Teleostei, Characidae) do médio Rio Paranapanema, Paraná, Brasil
(Revista Brasileira de Zoologia, 2004-06-01) [Artigo]
O objetivo desse trabalho foi a determinação da estrutura populacional da espécie. Foram escolhidos quatro locais de amostragem com características ambientais distintas na bacia do rio Tibagi. As amostragens foram realizadas ...
Increased B chromosome frequency and absence of drive in the fish Prochilodus lineatus
(Heredity, 1997-11-01) [Artigo]
The neotropical freshwater fish species Prochilodus lineatus (Pisces, Prochilodontidae) shows 2n = 54 chromosomes plus supernumerary microchromosomes ranging in number from zero to seven among different animals. The ...
Molecular identification of hybrids between Neotropical catfish species Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum
(Aquaculture Research, 2011-11-01) [Artigo]
Homomorphic Sex Chromosomes and the Intriguing Y Chromosome of Ctenomys Rodent Species (Rodentia, Ctenomyidae)
(Cytogenetic And Genome Research, 2014-01-01) [Artigo]
Unlike the X chromosome, the mammalian Y chromosome undergoes evolutionary decay resulting in small size. This sex chromosomal heteromorphism, observed in most species of the fossorial rodent Ctenomys, contrasts with the ...
5S rDNA chromosomal mapping and COI sequence analysis reveal differentiation among distinct populations of a characid fish Serrapinnus notomelas
(Reviews in Fish Biology and Fisheries, 2011-12-01) [Artigo]
Cheirodontinae comprises a small-sized fish group with a wide geographical distribution throughout Central and South America, mainly in Brazilian Basins. The species Serrapinnus notomelas is widely distributed in the Upper ...
Genetics of neotropical fish: from chromosomes to populations
(Fish Physiology and Biochemistry, 2009-03-01) [Artigo]
The Neotropical freshwater fish fauna is very rich-according to the most recent catalogue 71 families and 4,475 species have been described. However, only a small amount of general information is available on the composition ...
Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae)
(Neotropical Ichthyology, 2010-03-01) [Artigo]
Os cariótipos de sete espécies de peixes do gênero Characidium, três estudadas pela primeira vez, foram caracterizados com o uso das técnicas citogenéticas convencionais (Giemsa, Ag-RONs e bandamento-C). Todas as espécies ...
Cytogenetic analysis of three catfish species of the family Pseudopimelodidae (Teleostei, Siluriformes)
(Genetics and Molecular Biology, 2008-01-01) [Artigo]
Cytogenetic analyses performed in Cephalosilurus apurensis, Microglanis aff. cottoides and Pseudopimelodus bufonius revealed that the three species have 2n = 54 chromosomes: C. apurensis presented six metacentric (M), 28 ...