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  • Electronic Resource  (5)
  • 1
    Electronic Resource
    Electronic Resource
    The status of the barbel, Barbus barbus (L.) (Teleostei, Cyprinidae), in the United Kingdom (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The barbel was originally a fish with a relatively restricted range in the British Isles. However, despite the general environmental degradation of many British rivers, and in contrast with some native freshwater fishes, the barbel is now more widely distributed than it was a century ago. It may even be more abundant numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05870.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fertility of roach × bream hybrids, Rutilus rutilus (L.) ×Abramis brama (L.), and their identification (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 30 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Adult roach, bream and their presumed F1 hybrid from an Anglian Water reservoir were identified on the basis of morphological and meristic characteristics. The hybrid was clearly intermediate. Four hybrid breeding crosses were induced to spawn by hypophysis. A bream × roach cross (female named first) failed to produce fertile eggs, whereas F1 hybrid × roach, roach × F1 hybrid and F1 hybrid × F1 hybrid all produced fry. Fertility (defined as survival of eggs to hatching) was high for the F1 hybrid × roach back-cross (56%) but low for the others (〈2%), in comparison to the pure species controls (roach 69%, bream 76%). Progeny from these crosses were reared until anal fin rays could be counted. These counts indicated intermediacy between the parents and back-crossed individuals, and similarity between F1 hybrids and their F2 progeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05750.x
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  • 3
    Electronic Resource
    Electronic Resource
    Sampling strategy related to fish distribution, with particular reference to the Norfolk Broads (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 27 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Large-scale movements of fish within a complex freshwater system such as the Norfolk Broads can give rise to erroneous sampling data if the extent of these movements is not fully appreciated. The Norfolk Broads habitat is briefly described, and data are presented showing that mean estimates of standing crop in the broads vary from 〈1gm-2 in the winter to 9.4 gm-2 in the summer. The widespread nature of the phenomenon is demonstrated by winter and summer data from five broads, and a more detailed picture of the seasonal changes is shown by an intensive 2-year study on one of these broads. Winter aggregations of fish have been found in sites adjacent to rivers connected with the broads, with densities of up to 36.7 fish m-2 and a biomass of 1787 gm-2. Accurate overall estimates of fish standing crop can only be obtained when fish are maximally dispersed during the summer months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb03239.x
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  • 4
    Electronic Resource
    Electronic Resource
    Controlled breeding studies to verify the identity of roach and common bream hybrids from a natural population (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The occurrence of post-F1 generation hybrids between common bream and roach in natural populations has still to be qualified. To do this, common bream, roach, F1 and F2 hybrid progeny were produced under controlled conditions. All progeny groups exhibited overlaps in the ranges of their meristic characters. Discriminant analysis of meristic data combined with allozymes allowed identification of post-Fl hybrids. Enzyme electrophoresis showed Fl progeny to be heterozygous at diagnostic loci. Back-crossed F2 progeny had a mixture of homozygosity and heterozygosity at diagnostic loci. Meristic and genetic analysis of fish from a natural population indicated that they were all F1 hybrids. Post-Fl hybridization cannot be ruled out from natural populations because Fl hybrids are known to be fertile. It is suggested that post-Fl hybrids were not detected either because of their low incidence of occurrence or due to biological phenomenon Such as inferior fitness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01991.x
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of genomic regions associated with stay green in sorghum by testing RILs in multiple environments (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 1225-1232 
    Details
    ISSN: 1432-2242
    Keywords: Key words Sorghum ; Genome mapping ; Stay green ; Marker-assisted selection ; Multi-environment testing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Stay green is an important drought resistance trait for sorghum production. QTLs for this trait with consistent effects across a set of environments would increase the efficiency of selection because of its relatively low heritability. One hundred and sixty recombinant inbreds, derived from a cross between QL39 and QL41, were used as a segregating population for genome mapping and stay green evaluation. Phenotypic data were collected in replicated field trials from five sites and in three growing seasons, and analysed by fitting appropriate models to account for spatial variability and to describe the genotype by environment interaction. Interval mapping and non-parametric mapping identified three regions, each in a separate linkage group, associated with stay green in more than one trial, and two regions in single trial. The regions on linkage groups B and I were both consistently identified from three trials. The multiple environment testing was very helpful for correctly identifying QTLs associated with the trait. The utilisation of molecular markers for stay green in sorghum breeding is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051428
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