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  • 1
    Electronic Resource
    Electronic Resource
    Effects of General Anesthetics and Pressure on Mammalian Excitatory Receptors Expressed in Xenopus Oocytes (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 625 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb33834.x
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  • 2
    Electronic Resource
    Electronic Resource
    Heterosis in resistance to Ichthyophthirius multifiliis infections in poeciliid fish (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 44 (1994), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Resistance to experimental infections of Ichthyophthirius multifiliis was investigated in the poeciliid fish Xiphophorus maculatus, X. variatus and their two reciprocal hybrids. A third species, the goodeid Ameca splendens, was infected for comparative purposes. Infection data were analysed using a generalized linear interactive modelling package (GLIM). Infection levels were not significantly influenced by the sex of the fish, temperature, or speciestemperature interactions, but body area and time of infection did affect susceptibility. After accounting for variation due to these factors, it was shown that the two reciprocal hybrids of X. maculatus and X. variatus had significantly lower infection levels than either parental stock. Heterosis, H, was calculated from both raw data (16.2%) and from modelled values (31.3%) after removal of environmental factors. This confirms the existence of genetic factors determining resistance to /. multifiliis infection and has shown that gains in resistance can be made through hybridization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1994.tb01585.x
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  • 3
    Electronic Resource
    Electronic Resource
    Interspecific and intraspecific variation in resistance to ichthyophthiriasis among poeciliid and goodeid fishes (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 40 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A study was undertaken on genetic variation in resistance to infection by Ichthyophthirius multifiliis in two goodeid (Ameca splendens and Ilyodon xantusi) and two poeciliid species (Xiphophorus maculatus and Xiphophorus variatus), and among four strains of X. maculatus (red, red wagtail, yellow comet tail, blue). Analysis of infection data was performed with a generalized linear interactive modelling package (GLIM). Partitioning of the variation was such that the minimal variation attributable to each of several factors was computed. Size of fish, parasite isolate, temperature/tank effects, and various interactions all affect infection levels. Removal of these effects allowed the identification of highly significant differences in both inter- and intraspecific variation in resistance. Three distinct groups of fish were identified in terms of their resistance. Species recently derived from wild populations (the two goodeids) were more susceptible than the two poeciliid species which have a much longer history of domestication. The blue strain of X. maculatus had significantly higher resistance than the other three strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02589.x
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  • 4
    Electronic Resource
    Electronic Resource
    Natural hybrids between Atlantic salmon, Salmo salar L., and trout, Salmo trutta L., in juvenile salmonid populations in south-west England (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 39 (1991), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Electrophoretic analysis of juvenile salmonids from south-west England revealed the presence of natural hybrids between Atlantic salmon, Salmo salar L., and brown trout, Salmo rrurra L., within three of five rivers. Amongst 409 juvenile ‘salmon’, 1.2% were hybrids, and of 150 juvenile ‘trout’ sampled, 2.0% were natural hybrids. In one river, similar hybridization levels in ‘salmon’ parr samples were found in two successive years. Levels of hybridization are high when compared with most similar studies, especially others within the United Kingdom. Possible factors influencing this are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1991.tb05095.x
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  • 5
    Electronic Resource
    Electronic Resource
    Allozyme variation in Atlantic salmon from the British Isles: associations with geography and the environment (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Data on geographical variation in allele frequencies at enzyme coding loci in Atlantic salmon from the British Isles were collated from published and unpublished sources. Statistically significant differences in allele frequencies were found among samples both within and among river systems, suggesting that the Atlantic salmon in the British Isles is not a panmictic population and that even within major river systems it cannot be treated as a single genetic stock for fisheries management purposes. Although there was some evidence of regional differences in the frequency of some rare alleles, most single-locus variation did not show strong geographic patterns, with the exception of the AAT-4* locus at which allele frequencies had a significant latitudinal cline. There was some evidence for the existence of genetically-distinct celtic and boreal races of Atlantic salmon in the British Isles as previously has been suggested. Multiple regression analyses revealed associations between genetic variation and local environmental conditions (i.e. between variation at MEP-2* and both temperature and local river gradient), providing additional evidence for adaptive population divergence in the species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00845.x
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  • 6
    Electronic Resource
    Electronic Resource
    Ichthyophthirius multifiliis: standardization of the infection-response model in Ameca splendens (Miller & Fitzsimons) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 11 (1988), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. The goodeid fish Ameca splendens (Miller & Fitzsimons) was exposed to the parasite Ichthyophthirius multifiliis. Exposure levels were 2000,3000,6000 and 12000 theronts per fish. After 3 days, infection levels were determined and the body area of the fish was measured. A rise in the number of trophozoites per fish was observed, up to a level of 6000 theronts per fish. Standardization of infection and response by area, to theronts per square centimetre and trophozoites per square centimetre respectively, produced a significant linear relationship, up to an exposure of 2800 theronts per square centimetre, and also removed the between-tank within-dose variation. The measures of controlling exposure to 1. multifiliis and evaluating response in previous research are reviewed. Adoption of the technique described here will facilitate the collation of research on ichthyophthiriasis by permitting comparisons of different studies utilizing different sizes and species of fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1988.tb00732.x
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  • 7
    Electronic Resource
    Electronic Resource
    Modelling the impact of Land-Use Change to Water Resources in the Uplands of Scotland (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 14 (2000), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The predictions of a semi-empirical evaporation model, and their implications to water resources for the uplands of Scotland, are presented for a range of land-use and climatic scenarios. Three principal vegetation types (coniferous plantation forest, heather and upland grasses) are assessed. The model only requires daily rainfall, Penman potential evaporation, and snow line information as input data. A description of the modelling approach is given, and its performance is assessed by comparing its predictions to the water balances of nine partially afforested Scottish upland catchments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.2000.tb00269.x
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  • 8
    Electronic Resource
    Electronic Resource
    Genetics of susceptibility and resistance to disease in fishes (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 26 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The genetics of disease resistance in fish is examined. Major genes may cause skeletal or other phenotypic deformities and have also been implicated in the development of neoplasia. Others may affect viability through pleiotropic effects, or induce stress and therefore predispose to invasion by pathogens. Resistance usually appears, however, to be of a multifactorial nature. Variations in resistance between related species and between populations of the same species are described. In order to obtain an idea of the within-population variation, heritability estimates have been obtained in some instances. Generally they are low, but may still indicate a sufficient level to be of use in a selection programme. The results of a limited number of selection programmes are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb04291.x
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic variation in Atlantic salmon, Salmo salar L., within the Tamar catchment in south-west England (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Electrophoretic analysis of enzymes in 383 juvenile Atlantic salmon, Salmo salar L., within the Tamar catchment (south-west England) revealed significant genetic differences at the IDHP-3* locus between the three tributaries studied. Aspects of temporal and spatial variation, and management policy within catchments, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00315.x
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  • 10
    Electronic Resource
    Electronic Resource
    Standardization of infection and response to white spot, Ichthyophthirius multifiliis, in fish (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 31 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05323.x
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