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  • Acyrthosiphon kondoi  (2)
  • Developmental rate  (1)
  • 1
    ISSN: 1432-1939
    Keywords: Developmental rate ; Adult weight ; Adaptation ; Temperature ; Acyrthosiphon pisum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Developmental rate and adult weight were studied at constant temperatures from 9.8 to 27.9°C for 18 clones from each of five populations of the pea aphid, Acyrthosiphon pisum (Harris), from locations between 39 and 53°N latitude in central North America. The response of developmental rate to temperature for each clone was accurately described by a three parameter non-linear equation. Adult weight usually decreased with increasing rearing temperature, but the shape of the response to temperature varied among clones. Variation in the developmental parameters was greater among clones within populations than among populations. No consistent trends were observed in the developmental parameters or adult weights either with latitude or the long term average temperatures at the locations. We conclude that previously reported geographic variation in the developmental threshold of this species, which was attributed to local adaptation, occurred either because the clones tested were not representative of the populations or because rearing methods differed among studies. The results are discussed in relation to the hypothesis that life history traits which are temperature sensitive are adapted to local thermal environments.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 48 (1988), S. 117-125 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 45 (1987), S. 195-198 
    ISSN: 1570-7458
    Keywords: Acyrthosiphon pisum ; Acyrthosiphon kondoi ; alatae ; crowding ; competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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