PMID- 24260688 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20131122 LR - 20220330 IS - 1993-0771 (Print) IS - 1993-078X (Electronic) IS - 1993-0771 (Linking) VI - 7 IP - 1 DP - 2013 TI - Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae), from the Iberian Peninsula. PG - 33-42 LID - 10.3897/CompCytogen.v7i1.4672 [doi] AB - In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3)-fluorescence, Silver-impregnation (Ag-NORs)) and molecular (fluorescence in situ hybridization (FISH) with 18S rDNA probe) protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species. FAU - Nabais, Catarina AU - Nabais C AD - Universidade de Lisboa, Faculdade de Ciencias, Centro de Biologia Ambiental, Campo Grande, Lisboa, Portugal. FAU - Rampin, Massimiliano AU - Rampin M FAU - Collares-Pereira, Maria Joao AU - Collares-Pereira MJ LA - eng PT - Journal Article DEP - 20130318 PL - Bulgaria TA - Comp Cytogenet JT - Comparative cytogenetics JID - 101503807 PMC - PMC3833748 OTO - NOTNLM OT - Cytotaxonomy OT - FISH with rDNA OT - Leuciscinae OT - NOR-phenotype OT - chromomycin A3 OT - silver staining EDAT- 2013/11/22 06:00 MHDA- 2013/11/22 06:01 PMCR- 2013/03/18 CRDT- 2013/11/22 06:00 PHST- 2013/01/12 00:00 [received] PHST- 2013/02/14 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.v7i1.4672 [doi] PST - epublish SO - Comp Cytogenet. 2013 Mar 18;7(1):33-42. doi: 10.3897/CompCytogen.v7i1.4672. eCollection 2013.