Title:

Morphological relationships between polyploid hybrid spined loaches of the genus Cobitis (Teleostei: Cobitidae) and their parental species

Subtitle:

Annales Zoologici, vol. 58, no 4 ; Genus Cobitis (Teleostei: Cobitidae)

Creator:

Kotusz, Jan

Contributor:

Muzeum i Instytut Zoologii Polskiej Akademii Nauk

Publisher:

Natura optima dux Foundation

Place of publishing:

Warszawa

Date issued/created:

2008

Description:

Bibliogr. p. 904-905 ; P. 891-905 : ill. ; 27 cm ; Taxa in Latin

Type of object:

Journal/Article

Subject and Keywords:

Pisces ; unisexual fishes ; diploid-polyploid complexes ; taxonomy ; phenotypic variability ; gene-dose effect

Abstract:

A special feature of spined loaches of the genus Cobitis in Central Europe isthe frequent occurrence of diploid-polyploid complexes in which polyploid gynogeneticforms act as sperm parasites to the diploid form. This tight binding of the co-occurringforms results in a high level of phenotypic and ecological similarities. The present studysearches for morphological differences between them applying the characters traditionally used in loach taxonomy (body proportions, fin formula, scale shape, lamina circularis, suborbital spine, coloration) in 662 specimens from the Baltic (14 populations) and NorthSea (1 population) catchment areas. Ploidy level of each specimen was inferred from blood cell measurements. Discriminant function analysis for biometrical characters and description of qualitative features indicate the morphological distinctness of the two diploidspecies C. taenia and C. elongatoides. The polyploid unisexual biotypes are very similarto each other and to individuals of sympatric sexual species. The genome dosage effectcould be observed in morphological characters, however, in some of them the polyploid biotypes display a mosaic mode of variability: they can be more similar to sympatric parents or to the absent species in the complex, transitional and of a wider variabilityrange. In colouration pattern, the biotypes do not express the whole spectrum of the parental species variability. Meristic traits had no power to identify the different forms.

Relation:

Annales Zoologici

Volume:

58

Issue:

4

Start page:

891

End page:

905

Resource type:

Text

Detailed Resource Type:

Article : original article

Format:

application/pdf

Source:

MiIZ PAN, call no. P.255, vol 58, no 4 ; MiIZ PAN, call no. P.4314, vol 58, no 4 ; click here to follow the link

Language:

eng

Language of abstract:

eng

Rights:

Rights Reserved - Restricted Access

Terms of use:

Copyright-protected material. Access only on terminals at the Museum and Institute of Zoology of the Polish Academy of Sciences, may be used within the limits of statutory user freedoms.

Digitizing institution:

Museum and Institute of Zoology of the Polish Academy of Sciences

Original in:

Library of the Museum and Institute of Zoology of the Polish Academy of Sciences

Projects co-financed by:

Programme Innovative Economy, 2010-2014, Priority Axis 2. R&D infrastructure ; European Union. European Regional Development Fund

Access:

Closed