Morphological Relationships Between Polyploid Hybrid Spined Loaches of the Genus<i>Cobitis</i>(Teleostei: Cobitidae) and their Parental Species

Kotusz, Jan

doi:10.3161/000345408x396800

Cited by 19 publications

(27 citation statements)

References 27 publications

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“…This species is slightly distinguished by a single black spot, either oval or round in shape and located in the upper part of the caudal peduncle. C. elongatoides attained larger total length (9.3 cm for males and 11.5 cm for females) than C. taenia (total length is 8.3 cm for males and 10.5 cm for females) Kotusz, 2008). C. taenia achieves sexual maturity in the first or the second (males) and second (females) year of their life (Juchno & Boroń, 2006;Juchno et al, 2007).…”

Section: Introductionmentioning

confidence: 93%

Histological evidence that diploid hybrids of Cobitis taenia and C. elongatoides (Teleostei, Cobitidae) develop into fertile females and sterile males

Juchno

Boroń

2018

Hydrobiologia

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In Europe, two bisexual fish species, Cobitis taenia (TT) and Cobitis elongatoides (EE), hybridized, producing diploid and polyploid clonal lineages. This study compared, for the first time, embryonic development, hatching success, sex ratio, body size and as well as reproductive ability based on the gonad histology of F1 reciprocal diploid hybrids (TE, ET) of both species. Hybrid F1 progeny showed the same proper pattern of embryonic and larval development. Among TE and ET offspring, slightly more females and males, respectively, occurred, but sex parity among 18-month-old hybrids was observed. Two-and three-year-old F1 hybrid females were mature, possessing all stages of oogenesis in their ovaries. Females (TE) back-crossed with C. taenia males had properly developing progeny. In testes of two-and three-year-old F1 hybrids, only early stages of spermatogenesis and pyknotic cells indicating the degeneration process were observed, but they exhibited an external feature (lamina circularis) of maturation. The results were confirmed by the structure of gonads that two sexual species, C. taenia and C. elongatoides, hybridize, producing F1 progeny of sterile males and fertile females. Hybrid females may participate in subsequent steps of speciation via hybridization and polyploidy or, on the contrary, represent an element of new species isolation.

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Section: Introductionmentioning

confidence: 93%

Histological evidence that diploid hybrids of Cobitis taenia and C. elongatoides (Teleostei, Cobitidae) develop into fertile females and sterile males

Juchno

Boroń

2018

Hydrobiologia

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“…data) were recorded from the Wroclaw section of the Odra. Sexual and asexual forms are morphologically very similar, and their identification requires genetic methods (Boroń 2004, Kotusz 2008. The fishes of the so called "Cobitis complex" in the Odra basin (Boroń 2004) were recorded in the Odra, some of its canals, lower sections of Oława and Widawa.…”

Section: Cobitidae -Loachesmentioning

confidence: 99%

Ichthyofauna of Wrocław - the Odra River, its tributaries and the selected city reservoirs

Witkowski¹,

Kleszcz²,

Błachuta

et al. 2012

Fragm. Faun.

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Abstract:The ichthyofauna o f the O dra River, its m ajor tributaries (Oława, Widawa, Bystrzyca, Ślęza) and selected reservoirs (sand and clay pits, city park ponds, recreational reservoirs, city m oat) within the city o f W rocław is described on the basis o f data obtained in our ow n studies (electrofishing and net-catching), quality control catches o f the Polish Angling Association, analysis o f stocking registers, control and analysis o f angling inquiries and interviewing anglers in 1980-2010. Forty six fish and lamprey species were recorded: 42 in the Odra River, and 41 in its tributaries. Twenty eight species were recorded from the city reservoirs; they represented euryoecious and stagnophilous ecological groups. The study area holds nine species w hich are legally protected in Poland (Lampetra planeri, Acipenser oxirynchus, Gobi о albipinnatus, Rhodeus sericeus, Eupallasella percnurus, Cobitis taenia, Sabanejewia baltica (=aurata), Misgurnus fossilis, Barbatula barbatula) and five species regarded as endangered in the country {Barbus barbus, Vimba vimba, Chondrostoma nasus, Hucho hucho, Salmo salar). Eleven species occurring in the w ater courses and reservoirs o f W roclaw are protected within the EU Habitats Directive (92/43/EW G). Ten species introduced accidentally or on purpose occur in the city. Despite the high anthropopressure, including intensive angling, the W roclaw waters still hold diverse, and the O dra River itself -even rich -fish communities.

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“…Local proportions of sexual and clonal counterparts may differ considerably between study sites (Mezhzherin & Chudakorova, 2001;Boroń , 2003;Mezhzherin & Pavlenko, 2007;Janko et al, 2007b, COEXISTENCE OF C. TAENIA SEXUAL AND ASEXUAL FORMS 221 2012Kotusz, 2008;Vasil'ev, Lebedeva & Vasil'eva, 2011), but as in other asexual taxa, the reasons for such differences remain unclear. They may reflect stochastic fluctuations (e.g.…”

Section: Introductionmentioning

confidence: 99%

Role of parasite load and differential habitat preferences in maintaining the coexistence of sexual and asexual competitors in fish of theCobitis taeniahybrid complex

Kotusz

Popiołek

Drozd

et al. 2014

Biol J Linn Soc Lond

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In the context of the paradoxical ubiquity of sex, we tested whether stable coexistence of sexual and asexual fish of the genus Cobitis is mediated by parasites, as asexual fish suffer more from parasitic infections because of their lower genetic variability [the Red Queen hypothesis (RQH)], or by partial niche shift of the two strains differing in mode of reproduction. We did not find a clear correlation between infection risk with a helminth parasite and the proportion of sexuals, and we found similar infection rates among sexual females and co-occurring asexuals in general, including the most frequent clone in particular. These results suggest that the mechanisms of the RQH are not directly engaged in stabilizing this asexual complex. On the other hand, the temporally stable gradient in sexual/asexual proportions along the river correlated with gradients in environmental parameters (physicochemical water parameters, velocity, and shading of the habitat) and turnover in the fish assemblage structure. Sexual and asexual forms thus appear to prefer different habitats. The Cobitis teania asexual complex thus contributes to the view that persistence of sex may, as in many taxa, be driven by case-specific processes.

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Morphological Relationships Between Polyploid Hybrid Spined Loaches of the GenusCobitis(Teleostei: Cobitidae) and their Parental Species

Cited by 19 publications

References 27 publications

Histological evidence that diploid hybrids of Cobitis taenia and C. elongatoides (Teleostei, Cobitidae) develop into fertile females and sterile males

Histological evidence that diploid hybrids of Cobitis taenia and C. elongatoides (Teleostei, Cobitidae) develop into fertile females and sterile males

Ichthyofauna of Wrocław - the Odra River, its tributaries and the selected city reservoirs

Role of parasite load and differential habitat preferences in maintaining the coexistence of sexual and asexual competitors in fish of theCobitis taeniahybrid complex

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