Karyotype and genome size of Iberochondrostoma almacai (Teleostei, Cyprinidae) and comparison with the sister-species I.lusitanicum

This study aimed to define the karyotype of the recently described Iberian endemic Iberochondrostoma almacai, to revisit the previously documented chromosome polymorphisms of its sister species I.lusitanicum using C-, Ag-/CMA3 and RE-banding, and to compare the two species genome sizes. A 2n = 50 karyotype (with the exception of a triploid I.lusitanicum specimen) and a corresponding haploid chromosome formula of 7M:15SM:3A (FN = 94) were found. Multiple NORs were observed in both species (in two submetacentric chromosome pairs, one of them clearly homologous) and a higher intra and interpopulational variability was evidenced in I.lusitanicum. Flow cytometry measurements of nuclear DNA content showed some significant differences in genome size both between and within species: the genome of I. almacai was smaller than that of I.lusitanicum (mean values 2.61 and 2.93 pg, respectively), which presented a clear interpopulational variability (mean values ranging from 2.72 to 3.00 pg). These data allowed the distinction of both taxa and confirmed the existence of two well differentiated groups within I. lusitanicum: one that includes the populations from the right bank of the Tejo and Samarra drainages, and another that reunites the southern populations. The peculiar differences between the two species, presently listed as “Critically Endangered”, reinforced the importance of this study for future conservation plans

Karyotype analysis of ground squirrel (Mammalia: Rodentia) in Malatya (Türkiye)

The study was carried out in order to determine chromosomal variations both within and between populations in Spermophilus in Malatya. By the analysis of karyotypes we obtained the diploid chromosome number 2n = 42 and NF = 68 and NFa = 64 of these one pair of chromosome was metacentric, seven pairs were submetacentric, four pairs were subtelocentric and eight pairs were acrocentric. The X chromosome was metacentric and Y was acrocentric. In the result it was shown that there was difference neither in the number nor in the morphology of the chromosomes both within and between populations. The results were compared with previous studies and the karyological and taxonomical status of Spermophilus were discussed. © 2006 Asian Network for Scientific Information

Constitutive heterochromatin in Acanthobrama marmid and Cyprinion macrostomus (Osteichthyes, Cyprinidae) [Acanthobrama marmid ve Cyprinion macrostomus (Osteichthyes, Cyprinidae)'un Konstitütif Heterokromatini]

Constitutive heterochromatin were studied in two Cyprinids Acanthobrama marmid and Cyprinion macrostomus in Turkey. The C-band patterns of the metaphase chromosomes of these species were reported. Diploid chromosome number was 2n=50 in all specimens. The C-bands were seen in the pericentromeric regions of all chromosomes in both species. In addition C-bands were observed on the short arms of two pairs of submetacentric chromosomes of A. marmid and on the short arms of two pairs of submeta-subtelocentric chromosomes of C. macrostomus. There were similarities between C-band blocks and NOR regions. C-band patterns were also similar in both species

Karyotype of Pseudorasbora parva (Temminck and Schlegel 1846) (Pisces, Cyprinidae) in Ki{dotless}zi{dotless}li{dotless}rmak River, Turkey [Ki{dotless}zi{dotless}li{dotless}rmak'taki (Türkiye) Pseudorasbora parva (Temminck and Schlegel 1846) (Pisces, Cyprinidae)'ni{dotless}n Karyotipi]

Karyotype of Pseudorasbora parva in the Ki{dotless}zi{dotless}li{dotless}rmak River, Turkey, was investigated by kidney tissue. Diploid chromosome number was 2n=50. The karyotype consisted of 7 pairs of metacentric, 10 pairs of submetacentric and 8 pairs of subtelocentric chromosomes, and the fundamental number (NF) was 100. No heteromorphic sex chromosomes were found

Karyotype of River Loach Turcinoemacheilus kosswigi Banarescu and Nalbant, 1964 (Cypriniformes, Balitoridae) from the Euphrates River, Turkey

WOS: 000307267100011Karyotype of river loach Turcinoemacheilus kosswigi from the Euphrates River, Turkey was investigated using conventional Giemsa-staining and C-banding. Two females and two males were analyzed. Diploid chromosome number was 2n= 50 in all specimens. The karyotype consisted of four pairs of metacentric (m), seven pairs of submeta (sm)-subtelocentric (st) and 14 pairs of acrocentric (a) chromosomes, the number of chromosome was NF= 72. No heteromorphic sex chromosomes were found. C-banded positive constitutive heterochromatin was found in the entire short arms of a pair of large m-sm chromosomes and in the centromeres of several chromosome pairs though to a lesser extent. Karyotype and C-banding patterns of T. kosswigi were compared with those of other loaches

Karyotype of mullet Liza abu Heckel, 1846 (Pisces: Mugilidae) from the Tigris River, Turkey

WOS: 000313553400034…University of Dicle, TurkeyDicle University [DUAPK-05-FF-56]We are thankful to Professor Anna Rita Rossi from the Department of Animal and Human Biology, University of Rome, for helping the authors with valuable comments on the manuscript. This study was funded by the University of Dicle, Turkey (DUAPK-05-FF-56)