000			03228nas a2200349 a 4500
003			AR-ReUNN
005			20260702154113.0
008			260630c19959999bl |||||||||||||||por
041	0		_apor
100	1		_aJorge, Lilian Cristina _9131833
245	1	0	_aEstudios citogenéticos comparativos de algumas espécies de peixes da regiâo de Corrientes-Argentina com as do Alto Paraná / Lilian Cristina Jorge
264		1	_aSâo Carlos _bUniversidade Federal de Sâo Carlos.centro de Ciências Biológicas e da Saúde. Departamento de Genética e Evoluçâo _c1995
300			_a143 páginas
500			_aDisponible en estante de INICNE
520			_aFive species of fishes belong to four different families, Hoplias malabaricus, H. unitaeniatus (Erythrinidae), Apareiodon affinis bimaculatus (Characidae), were cytogentically compared. They were collected in Paraná river (Corrientes, region fo Argentina) placed southern antique Falls of Guaíra (Sete Quedas). It was realized a karyotype comparison with species of fishes from Mogi Guacú (SP) and Passa cinco (SP) rivers which belong to Alto Paraná basin. The species Hoplias malabaricus from Alto Paraná presented variation in the diploid number between sexes, female with 2n=40 an male with 2n=40, probably due to mechanisms of multiples sexual chromosomes system of the X1X1X2X2/X1X2Y type. Despite it, the same species from Corrientes region-Argentina, presented a diploid number of 40 in both sexes and no detected evidences of sexual chromosomes. We determined the presence in A. affinis from the same region, of diploid number of 54 and an structural polimorphism due to acrecentric chromosomes as a new fact for the family Parodontidae. The same species from Alto Paraná, on the other hand, showed male 2n=54 ZZ/ZW1 W2 type.These results indicate that probably antiga Sete Quedas falls was a geographic isolation barrier in the basin of Paraná river and species like H. malabaricus and A. affinis, from Alto Paraná could be endemic forms for this region. The species H. unitaeniatus, L. obtusidens and A. bimaculatus showed a great degree of karyotypical similarities among samples from the two places of aur study. This fact suggests that, these species would represet continuos units through out Paraná basin or that instead the geographic isolation composed by Sete Qudas falls, the karyotype evolution would keep the consevation of the chromosomic macro-structure of these species. With the new information obtained by the karyotype compared study of the species from the long Paraná basin, several problems raise to be solved for the ichthyofauna of this important hydrographic basin.
650		4	_aTesis _92
650		4	_aCitogenetica _99252
650		4	_aGenetics _9123028
650		4	_aHoplias Malabaricus _9134408
650		4	_aHoplerythrinus Unitaeniatus _9147323
650		4	_aApareiodon Affinis _9147311
650		4	_aAstyanax Bimaculatus _9144644
650		4	_aLeporinus Obtusidens _9119208
650		4	_aPeces de Agua Dulce _96471
650		4	_aArgentina _94258
650		4	_aFreshwater Fish _9117439
650		4	_aInland Waters _9117440
650		4	_aCorrientes _94086
942			_cCR
035			_a(INICN)33745
001			234595
999			_c234595 _d234595
040			_aAR-ReUNN _bspa _cAR-ReUNN _eaacr2