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2. Epidermis structure and blood parameter differences between sculpin Cottus gobio and Siberian sculpin Cottus poecilopus from the Morava watershed
- Creator:
- Halačka, Karel, Vítek, Tomáš, Vetešník, Lukáš, and Spurný, Petr
- Type:
- article, model:article, and TEXT
- Subject:
- goblet cell, sacciform cell, erythrocyte, and leucocyte
- Language:
- English
- Description:
- The epidermis structure of the studied specimens of Cottus gobio and C. poecilopus from the Morava watershed showed important differences. We noted a lower number of sacciform secretory cells in C. gobio, and also differences in relation to reproductive activity (the decrease in the number of secretory cells during the spawning period in both species). Significant differences were found in the erythrocyte count (1.90 ± 0.15 T.l–1 in C. gobio and 1.57 ± 0.07 T.l–1 in C. poecilopus), whereas the leucocyte count did not differ. A three-day-long exposure in higher temperature and lower oxygen saturated water conditions caused a marked increase in both blood parameters. These differences can be related to the distant physiological and ethological requirements of the species.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Fish occurrence in the fishpass on the lowland section of the River Elbe, Czech Republic, with respect to water temperature, water flow and fish size
- Creator:
- Prchalová, Marie, Horký, Pavel, Slavík, Ondřej, Vetešník, Lukáš, and Halačka, Karel
- Type:
- article and TEXT
- Subject:
- cyprinids, migration, general linear mixed models, adult fish, immature fish, and discharge
- Language:
- English
- Description:
- The effect of water temperature and flow on the migration of fish was observed using weekly inspections of a fishpass on the lowland section of the River Elbe (Střekov, Czech Republic) from spring to fall 2003 and 2004. The effect was examined separately for immature (up to 2 years old) and adult fish and also the most abundant species (roach Rutilus rutilus, bleak Alburnus alburnus, chub Squalius cephalus, gudgeon Gobio gobio). More than 13 thousand fish from 23 species were recorded in the fishpass during both years. The highest levels of fish occurrence in the fishpass were observed during the spring spawning migrations of adults (April-May) as well as during the late summer and fall migrations of adult and immature fish (September-November). While the total number of both fish age categories was significantly related to the interaction of water temperature and flow, however, responses of individual species and age categories differed from each other. The numbers of adult bleak, chub and gudgeon increased with higher temperature. The maximum numbers of adult bleak migrated at medium values of temperature (15-20 °C) and flow (140-270 m3 s–1). The abundances of adult chub and adult plus immature gudgeon were higher with higher flow. The numbers of immature bleak and chub decreased with increasing flow. The numbers of adult and immature roach were influenced only by water flow with maximal numbers migrating under medium values of flow. Generally, we observed that immature fish and small- and middle-sized species required lower values of water flow than adult fish or large species to facilitate their movement. The exception was gudgeon, which required higher values of flow for its migration, a feature that could be related to its bottom dwelling nature or rheophily.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/
4. Genetic diversity and taxonomy of Sabanejewia balcanica (Osteichthyes: Cobitidae) in the waters of the Czech Republic and Slovakia
- Creator:
- Bartoňová, Eva, Papoušek, Ivo, Lusková, Věra, Koščo, Ján, Lusk, Stanislav, Halačka, Karel, Švátora, Miroslav, and Vetešník, Lukáš
- Type:
- article and TEXT
- Subject:
- Balcan spined loach, conservation, cytochrome b, and mitochondrial marker
- Language:
- English
- Description:
- Seven populations (Oľšava/Hornád R., Oľšava/Topľa R., Ublianka R., Ondava R., Ipeľ R., Malý Dunaj R. and Vlára R.) of Balcan spined loach were subjected to phylogenetic analysis based on variability of the cytochrome b gene and mitochondrial specific marker. They were separated in to five groups but these groups were represented by specimens from different populations. Genetic distances among populations and among groups were quite low. Subsequently, analysis of relations among our groups and sublineages of Danubian-Balkanian complex of Sabanejewia was made. the first four groups were genetically close to sublineage III, while the fifth one to the sublineage IV. These findings agree with the conclusion about conspecificity of analysed Danubian-Dniester populations belonged to monotypic S. balcanica. Phylogenetic analysis showed that the most suitable populations for the restoration of this species in the Bečva River are populations dwelling the Ipeľ and Vlára rivers.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/
5. Genetic diversity of Gobio gobio populations in the Cyech Republic and Slovakia, based on RAPD markers
- Creator:
- Mendel, Jan, Lusková, Věra, Halačka, Karel, Lusk, Stanislav, and Vetešník, Lukáš
- Type:
- article and TEXT
- Subject:
- RAPD, common gudgeon, diagnostic markers, and intraspecific diversity
- Language:
- English
- Description:
- The random amplified polymorphic DNA (RAPD) method was applied to eight Gobio gobio populations living in the rivers of the Czech Republic and Slovakia. The application of seven RAPD primers yielded eight fingerprint characteristics for the populations examined. Forty diagnostic markers have been identified, which can reliably identify the populations under study. Intrapopulation diversity varied between 0.26 and 0.38. A phenogram documented the close agreement of the particular populations with the geographic pertinence of their localities to the different sea basins.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/
6. Genetic diversity of Misgurnus fossilis populations from the Czech Republic and Slovakia
- Creator:
- Mendel, Jan, Lusk, Stanislav, Koščo, Ján, Vetešník, Lukáš, Halačka, Karel, and Papoušek, Ivo
- Type:
- article and TEXT
- Subject:
- weather loach, endangered species, control region, cross-species amplification, and microsatellites
- Language:
- English
- Description:
- Monitoring of the analysed populations of the endangered fish species Misgurnus fossilis was conducted using microsatellite analysis and sequencing of a part of the control region. Absolutely first microsatellite markers for weather loach were found. Six polymorphic microsatellite loci were prepared, five of which were tested. Number of alleles per a locus ranged from 3 to 5. All studied populations are differentiated one from another (FST= 0.205 - 0.367). All sampled populations contained unique alleles. Sequential analysis of the mitochondrial control region showed great haplotype similarity of the studied populations which come from one widely spread haplotype H_1, and thus suggested possible hypothesis of recent spreading from one source.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/
7. Is gynogenetic reproduction in gibel carp (Carassius gibelio) a major trait responsible for invasiveness?
- Creator:
- Fuad, Md Mehedi Hasan, Vetešník, Lukáš, and Šimková, Andrea
- Format:
- počítač and online zdroj
- Type:
- model:article and TEXT
- Subject:
- fish, gynogenesis, invasive species, coexistence, immunity, environmental tolerance, and parasites
- Language:
- English
- Description:
- The invasion success of gibel carp (Carassius gibelio) depends on demographic and competitive traits. The major biological trait responsible for the invasiveness of C. gibelio is the mode of reproduction. Apart from sexual reproduction, which is typical in fish, C. gibelio is a unique cyprinid species able to reproduce through asexual gynogenesis, which is also known as sperm-dependent parthenogenesis, observed in all-female populations. Though the sexual and asexual forms of C. gibelio co-exist widely in natural habitats, the gynogenetic form has the capacity to modulate the range of effective ecological niches, which may facilitate the process of invasion. In this paper, we reviewed current knowledge of the sexual and gynogenetic forms of gibel carp along with their physiological advantages, immunological traits, and ability to withstand different environmental conditions. As parasitic infection may directly alter the immunology of hosts, and also indirectly alter their investment in reproduction, we provide some insights into the role of parasites as one of the potential drivers facilitating the coexistence of asexual and sexual forms. We highlight evidence that gibel carp have been identified as a serious threat to native species; hence, its impact on the ecosystem is also discussed.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
8. Migrations of juvenile and subadult fish through a fishpass during late summer and fall
- Creator:
- Prchalová, Marie, Vetešník, Lukáš, and Slavík, Ondřej
- Type:
- article and TEXT
- Subject:
- migration, fishway, cyprinids, and juveniles
- Language:
- English
- Description:
- Significant numbers of juvenile (age 0+) and subadult (age 1+ and 2+) fish were observed migrating through a lowland pool fish pass (Elbe River, Czech Republic) from August to October in 2003 and 2004. Records of weekly catches totalled 2 148 (2003) and 6 469 (2004), mainly bleak Alburnus alburnus , barbel Barbus barbus, roach Rutilus rutilus and dace Leuciscus leuciscus. Fish migrated in the upstream direction probably to search the feeding grounds and refuges and their numbers corresponded to spring spawning migrations in the same fishpass and the year.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/
9. Re-occurrence of Zingel streber (Teleostrei: Pisces) in the Czech Republic
- Creator:
- Lusk, Stanislav, Halačka, Karel, Lusková, Věra, and Vetešník, Lukáš
- Type:
- article and TEXT
- Subject:
- streber, occurrence, karyotype, meristic characters, length growth, and conservation
- Language:
- English
- Description:
- Almost after a century, the occurrence of Zingel streber (Siebold, 1863) was recorded again in the area of confluence of the rivers Morava and Dyje. The population consisted of fish 0+ to 5+, with 0+ group predominating in the sample, indicating that the species had successfully reproduced in 2003. Analysis was made of their karyotype (n=5) and meristic characters (n=10). The following was the result of a study of growth of standard lengths (n=16): SL1 – 81 mm, SL2 – 114 mm, SL3 – 130 mm, SL4 – 146 mm, SL5 – 166 mm. The biggest individual was a female 5+ of age, TL 200 mm, SL 180 mm. The habitat types preferred by individuals 0+ were the rapidly flowing sections with gravel bottom, in which the stream velocity was 0.2–0.6 m.s-1. Re-occurrence of this species was facilitated by the marked improvement of water quality after 1990 as well as by the barrier-free connection of sections of the rivers Morava and Dyje with the Danube via the Slovakian-Austrian part of the River Morava. Further dispersal of this species is limited by the weir in r.km 26.7 on the Dyje, and six weirs between r.km 74.1 and r.km 101.8 on the Morava. Z. streber is protected by national law and the area mentioned above has been proposed as a pSCI for the NATURA 2000 system.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/