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  • Migration  (1)
  • host resistance  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Seasonal variation in the photoperiodic responses of a pea aphid population: evidence for long-distance movements between populations (1989)
    Springer
    Oecologia 81 (1989), S. 160-165 
    Details
    ISSN: 1432-1939
    Keywords: Acyrthosiphon pisum ; Migration ; Adaptation ; Photoperiod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The purpose of the study was to quantify long distance movements in populations of pea aphid, Acyrthosiphon pisum (Harris), by estimating origins and distances travelled by immigrants into a southern Manitoba population. A strong relationship was demonstrated between latitude of origin and photoperiods at which pea aphid populations are stimulated to produce the diapause stage (Smith 1987). Therefore, the approach was to use photoperiodic response as a physiological marker to identify the source of immigrant aphids. The responses of 89 clones from Glenlea, Manitoba (49°38′N), sampled 5 times over 2 seasons, were measured. One sample of clones collected the first season had photoperiodic responses similar to those of a population about 300 km to the south, and significantly different from clones collected in spring of the same year at the same site. Weather analysis corroberates that the migrants were probably carried into Manitoba on a southerly flow of air during the previous 24 to 36 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379800
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic variation in asexual populations of two aphids in the genus Acyrthosiphon, from an Australian lucerne field (1988)
    Springer
    Entomologia experimentalis et applicata 48 (1988), S. 117-125 
    Details
    ISSN: 1570-7458
    Keywords: Acyrthosiphon kondoi ; Acyrthosiphon pisum ; Medicago sativa ; genetics ; variation ; host resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Douze lignées d'Acyrthosiphon kondoi Shinji et d'A. pisum Harris ont été échantillonnées dans un petit champ de luzerne australien et leur variabilité génétique examinée en comparant les réponses à 3 cultivars de luzerne. De 7 à 8 caractères biologiques avaient été retenus pour chaque espèce. Les différences observées entre les réponses suivant la distribution de ces caractères chez les pucerons, ont montré que 3 à 7 clones génétiquement distincts étaient représentés dans les 12 lignées de chaque espèce. Nous en concluons que les populations de ces deux espèces de pucerons sont polymorphes en Australie, quoiqu'elles se multiplient d'une façon asexuée et aient été récemment introduites. Les réactions des pucerons aux 3 cultivars sont indiquées. Par suite de la variabilité génétique des réactions des plantes hôtes aux pucerons, des cultivars à résistance potentielle élevée devraient être exposés à un grand nombre de clones de pucerons pour confirmer la présence d'une résistance utilisable.
    Notes: Abstract Twelve lines of Acyrthosiphon kondoi Shinji and Acyrthosiphon pisum (Harris) were sampled from a small lucerne field in Australia and tested to assess genetic variation by measuring their responses to three lucerne cultivars. Seven or eight life history traits were assessed for each species. Differences in the responses of these traits to the cultivars revealed that three to seven genetically distinct clones were represented in the samples of 12 lines for each species. We conclude that the populations of these two aphids are variable in Australia, although they were recently introduced and reproduce asexually. The responses of the aphids to the three cultivars are described. Because of genetic variation in host plant responses of the aphids, cultivars with potential aphid resistance must be exposed to a large number of clones to confirm the presence of useful aphid resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185623
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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