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  • 1
    Electronic Resource
    Electronic Resource
    Variation in bilateral asymmetry of the Lusitanian toadfish along the Portuguese coast (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Three types of bilateral asymmetry [antisymmetry (AS), directional asymmetry (DA) and fluctuating asymmetry (FA)] have long been recognized in the literature. It is often assumed that DA and AS have a larger genetic basis than FA, which therefore provides a measure of developmental stability. To examine changes in bilateral asymmetry of the Lusitanian toadfish, Halobatrachus didactylus (Bloch & Schneider, 1801), collected in 10 localities along the Portuguese coast, the distribution of left–right values of three external and two internal morphometric variables and one meristic variable were evaluated for normality and deviations of the mean to 0; kurtosis and skewness were also determined. AS was found for the majority of variables in all locations, although DA was also very frequent. FA was observed in only four locations for three variables. A general pattern of negative and low Spearman correlations between asymmetry levels and concentrations of heavy metals and pollutants and mean heterozygosity was found. However, exceptions to this pattern indicate that different asymmetry types can occur across the distribution range in a single trait and that the three types of asymmetry are dynamically interrelated, the shifts from FA to the other two types possibly being due to environmental stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00627.x
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  • 2
    Electronic Resource
    Electronic Resource
    Metazoan parasites as biological indicators of population structure of Halobatrachus didactylus on the Portuguese coast (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A total of 366 Halobatrachus didactylus (Bloch & Schneider 1801) individuals were obtained between September and November 2000 from commercial fishing vessels at eight localities along the Portuguese coast and analysed for metazoan parasite infections. Three species of parasites were found: Hysterothylacium aduncum Rudolphi 1802; Progrillotia dasyatidis Beveridge et al. 2004, which constitutes a new host record for the Lusitanian toadfish; and Nerocila orbignyi Guérin-Méneville 1829. Prevalence and mean abundance were determined for the total fish population in each sample. Significant differences in the number of parasitized fish among the samples analysed indicate differences in the H. didactylus populations along the Portuguese coast. The cluster analysis performed to prevalence data pointed out two major clusters: one composed of mainly estuarine samples and one that grouped samples from coastal areas; this is in agreement with the results obtained by morphological and genetic analysis performed for the same samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00655.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Selection of Portuguese Rhizobium leguminosarum bv. trifolii strains for production of legume inoculants (1992)
    Springer
    Plant and soil 147 (1992), S. 151-158 
    Details
    ISSN: 1573-5036
    Keywords: growth cabinet ; legume inoculants ; native strains ; nitrogen fixation ; Rhizobium leguminosarum bv. trifolii ; Trifolium subterraneum ; symbiotic effectiveness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract From several native clover species, growing in six different soil types, 170 Rhizobium leguminosarum biovar trifolii strains were isolated, covering the central and southern regions of Portugal. The effectiveness of the strains varied from ineffective to highly effective on T. subterraneum cv. Clare and on T. fragiferum cv. Palestine, with a predominance of medium and high effectiveness on both host plants. The effectiveness was not influenced by provenence (soil or plant), except for the strains from the rankers soils and for the strains isolated from T. pratense, that were ineffective or medium effective on T. subterraneum. Selected strains were evaluated for effectiveness on T. subterraneum cv. Clare, using the commercial strain TA1 as reference. Several of the isolated strains were more effective than TA1, indicating that local strains may be used to produce better inoculants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009381
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    Paper (German National Licenses)
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