PMID- 24260689
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20131122
LR  - 20211021
IS  - 1993-0771 (Print)
IS  - 1993-078X (Electronic)
IS  - 1993-0771 (Linking)
VI  - 7
IP  - 1
DP  - 2013
TI  - Comparative cytogenetics of two species of genus Scobinancistrus (Siluriformes, 
      Loricariidae, Ancistrini) from the Xingu River, Brazil.
PG  - 43-51
LID - 10.3897/CompCytogen.v7i1.4128 [doi]
AB  - The family Loricariidae encompasses approximately 800 species distributed in six 
      subfamilies. The subfamily Hypostominae consists of five tribes; of them, the 
      tribe Ancistrini is relatively diverse, but it is not well known from the 
      cytogenetic point of view. Genus Scobinancistrus Isbrucker et Nijssen, 1989, 
      which is part of the tribe Ancistrini, has two species that occur in sympatry in 
      the Xingu River, Brazil. In this work, we performed the first karyotypic 
      characterizations of these two species and sought to identify the processes 
      involved in their karyotypic evolution. Chromosomal preparations were subjected 
      to Giemsa staining, silver nitrate impregnation, C-banding, CMA3 staining, DAPI 
      staining, and FISH (fluorescence in situ hybridization) with 18S rDNA and 
      telomeric probes. We found that Scobinancistrus aureatus Burgess, 1994 and 
      Scobinancistrus pariolispos Isbrucker et Nijssen, 1989 shared the diploid number, 
      2n=52, but differed in their karyotypic formulae (KFs), distribution of 
      constitutive heterochromatin (CH), and the localizations of their nucleolus 
      organizer regions (NORs), which were found on the interstitial and distal regions 
      of the long arm of chromosome pair 3 in Scobinancistrus aureatus and 
      Scobinancistrus pariolispos respectively. We suggest that these interspecific 
      variations may have arisen via paracentric inversion or transposition of the NOR. 
      The karyotypic differences found between these two Scobinancistrus species can be 
      used to identify them taxonomically, and may have functioned as a mechanism of 
      post-zygotic reproductive isolation during the speciation process.
FAU - Cardoso, Adauto Lima
AU  - Cardoso AL
AD  - Laboratorio de Citogenetica, Instituto de Ciencias Biologicas, Universidade 
      Federal do Para - Campus do Guama (Belem, PA, Brazil).
FAU - Sales, Karline Alves Holanda
AU  - Sales KA
FAU - Nagamachi, Cleusa Yoshiko
AU  - Nagamachi CY
FAU - Pieczarka, Julio Cesar
AU  - Pieczarka JC
FAU - Noronha, Renata Coelho Rodrigues
AU  - Noronha RC
LA  - eng
PT  - Journal Article
DEP - 20130318
PL  - Bulgaria
TA  - Comp Cytogenet
JT  - Comparative cytogenetics
JID - 101503807
PMC - PMC3833746
OTO - NOTNLM
OT  - Karyotypic divergence
OT  - chromosome rearrangements
OT  - sympatry
EDAT- 2013/11/22 06:00
MHDA- 2013/11/22 06:01
PMCR- 2013/03/18
CRDT- 2013/11/22 06:00
PHST- 2012/10/15 00:00 [received]
PHST- 2013/02/19 00:00 [accepted]
PHST- 2013/11/22 06:00 [entrez]
PHST- 2013/11/22 06:00 [pubmed]
PHST- 2013/11/22 06:01 [medline]
PHST- 2013/03/18 00:00 [pmc-release]
AID - 10.3897/CompCytogen.v7i1.4128 [doi]
PST - epublish
SO  - Comp Cytogenet. 2013 Mar 18;7(1):43-51. doi: 10.3897/CompCytogen.v7i1.4128. 
      eCollection 2013.