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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 64 (1992), S. 167-176 
    ISSN: 1570-7458
    Keywords: Curculionidae ; Sitona hispidulus ; Leguminosae ; nodule herbivory ; compensatory growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A laboratory study was conducted to examine the hypothesis that herbivory of nitrogen-fixing root nodules on legumes causes an exact compensatory response in nodule growth. Plants of Medicago sativa (L.) were grown hydroponically in clear plastic growth pouches so that the number and biomass of root nodules could be estimated nondestructively before, and 10 and 18 days after, partial denodulation. For treatments, plants were subjected to 23% denodulation by first-instar larvae of Sitona hispidulus (F.) (a common herbivore of Medicago and Trifolium) or 50% nodule pruning; additional plants were left untreated. Results indicated that nodule herbivory and nodule pruning caused an overcompensatory response in number of nodules. This was also true for number of nodule units (an indirect measure of nodule biomass) per plant at 10 days after denodulation but had changed to an exact compensatory response by day 18. An inverse relationship between change in number of nodule units and initial number of nodules indicated that compensatory nodulation was regulated by a feedback mechanism. Shoot and root biomasses were not affected by denodulation in this study.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 32 (1987), S. 3-8 
    ISSN: 1573-8248
    Keywords: Sitona hispidulus ; egg predation ; carabids ; Amara aenea ; Sitona hispidulus ; prédateur oophage ; carabide ; Amara aenea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé L'effet sur les populations deSitona hispidulus (F.) [Col.: Curculionidae] causé par la prédation des œufs a été évalué dans des champs de luzerne en 1982 et 1983. L'abondance des adultes reproducteurs deS. hispidulus est en corrélation avec l'abondance des espèces de carabides capturées au moyen de pièges-fosse. Des prèdateurs potentiels des œufs ont aussi été identifiés pour une évaluation ultérieure. Les résultats indiquent que 359 des 1280 œufs (28 %) ont été enlevés par les prédateurs. Une espèce de carabide,Amara aenea DeGeer, s'est avérée un prédateur particulièrement efficace dans les expériences sous cage, sur le terrain.
    Notes: Abstract The predation on egg populations ofSitona hispidus (Fabricius) [Col.: Curculionidae] in a stand of alfalfa was evaluated in 1982 and 1983. By using pitfall traps, catches of reproductive adults ofS. hispidulus were correlated with catches of carabid species, and potential egg predators were identified for further evaluation. Results indicated that predators removed 28 % of eggs under field conditions.Amara aenea DeGeer was found to be particularly efficient on eggs ofS. hispidulus under caged-field conditions.
    Type of Medium: Electronic Resource
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