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  • Rhopalosiphum padi  (3)
  • growth patterns  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Pattern of growth and fat content of somatic and gonadal tissues of virginoparae of the vetch aphid, Megoura viciae (1990)
    Springer
    Entomologia experimentalis et applicata 56 (1990), S. 269-275 
    Details
    ISSN: 1570-7458
    Keywords: Aphids ; gonads ; growth patterns ; parthenogenesis ; soma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le pourcentage en eau reste constant pendant tout le développement des virginipares de Megoura viciae. De la naissance au début de la reproduction, les tissus somatiques croissent logistiquement et les gonades exponentiellement. Le poids relatif des gonades augmente pendant le développement. L'allure sigmoïde de la courbe de croissance reflète la cominaison des types de croissance des tissue somatiques et des gonades. Les gros adultes ont proportionnellement de plus grosses gonades que les petits. La teneur en corps gras augmente dans le soma et les gonades pendant le développement: dans le soma jusqu'à la mue imaginale, dans les gonades jusqu'au début de la reproduction.
    Notes: Abstract Throughout the development of virginoparous apterae of the vetch aphid, Megoura viciae, the percentage water content remained constant. Over the period from birth to the onset of reproduction the somatic tissues grew logistically and the gonads exponentially. During development the percentage of the weight of an aphid that consisted of gonads increased. The sigmoidal pattern of growth in weight of an aphid reflects the combined growth patterns of the somatic and gonadal components. Large adults had proportionally bigger gonads than small adults. The fat (lipid) content of both the soma and gonads increased during development; in the soma up to the adult moult, and the gonads up to the onset of reproduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163698
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  • 2
    Electronic Resource
    Electronic Resource
    Non-feeding by adult gynoparae of Rhopalosiphum padi and its bearing on the limiting resource in the production of sexual females in host alternating aphids (1984)
    Springer
    Entomologia experimentalis et applicata 36 (1984), S. 9-12 
    Details
    ISSN: 1570-7458
    Keywords: Rhopalosiphum padi ; feeding by gynoparae ; limiting resource ; production of sexual females
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des plantes radioactives ont été utilisées pour déterminer si les gynopares de Rhopalosiphum padi se nourrissaient après installation sur Prunus padus. Bien qu'affamés pendant 24 h, il ne se sont pas nourris. La signification adaptative de la brève vie des adultes et de la faible fécondité des gynopares a été examinée à la lumière de ces résultats.
    Notes: Abstract Radioactive plants were used to determine whether gynoparae of the bird cherry-oat aphid Rhopalosiphum padi (L.) fed after settling on Prunus padus (L.). Despite being starved for 24 h they did not feed. The adaptive significance of the short adult life and low fecundity of gynoparae was discussed in the light of these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345196
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  • 3
    Electronic Resource
    Electronic Resource
    Aphid growth and reproductive rates (1984)
    Springer
    Entomologia experimentalis et applicata 35 (1984), S. 137-140 
    Details
    ISSN: 1570-7458
    Keywords: Rhopalosiphum padi ; mean relative growth rate ; intrinsic rate of increase ; reproduction ; aphids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La taille des pucerons, bien que considérée généralement comme un bon indice de la fécondité, n'est pas un bon indice pour leurs performances dans une grande gamme de conditions. En général, plus le taux moyen de croissance relative est élevé chez les types aptères de Rhopalosiphum padi, plus leur fécondité est importante. Le taux intrinsèque de croissance (rm) est encore plus étroitement lié au taux moyen de croissance relative que la fécondité. Une fois que ces critères ont été quantifiés pour un type d'une espèce donnée de puceron dans une gamme de conditions, les taux intrinsèques de croissance des différents types sur un hôte particulier peuvent être estimés par une mesure rapide de leur taux moyen de croissance relative.
    Notes: Abstract Aphid size, although generally a good indicator of fecundity is not a good indicator of aphid performance over a wide range of conditions. In general, the greater the mean relative growth rate (MRGR) of apterous morphs of Rhopalosiphum padi (L.), the greater their fecundity. Intrinsic rate of increase (rm) is even more closely correlated with mean relative growth rate than fecundity. Once these criteria are quantified for a morph of a particular species of aphid over a range of conditions the morphs intrinsic rate of increase on a particular host can be estimated by a quick measure of its mean relative growth rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217532
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  • 4
    Electronic Resource
    Electronic Resource
    Pattern of growth in weight of alate and apterous nymphs of the English grain aphid, Sitobion avenae (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 231-238 
    Details
    ISSN: 1570-7458
    Keywords: Aphids ; growth patterns ; logistic growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'enregistrement de l'augmentation quotidienne du poids frais à 20°C des larves ailées et aptères de S. avenae a montré que des perturbations quotidiennes n'affectent pas significativement la croissance, la durée du développement et la survie. Les équations logistiques décrivent plus exactement l'augmentation de poids frais des aptères et des ailés virginipares à 20°C. Les virginipares ailés étaient significativement plus lourds que les virginipares aptères à la naissance et pendant la plus grande partie de la vie larvaire, mais présentaient une perte de poids à la mue finale. Le taux de croissance relative ne restait pas constant, mais diminuait au cours du développement. La diminution était associée à une diminution de la production de miellat par unité de poids du corps. La discussion porte sur les conséquences de la variation de l'augmentation du poids relatif et de la perte marquée de poids à la mue imaginale.
    Notes: Abstract Daily increase in fresh weight was recorded for apterous and alate nymphs of S. avenae at 20°C. Comparison with a control group indicated that daily disturbance and weighing of nymphs did not affect significantly their growth, developmental time or survival. The increase in fresh weight of apterous and alate virginoparae at 20°C was best described by logistic equations. Alate virginoparae were significantly heavier than apterous virginoparae at birth and throughout most of their nymphal life, but they experienced a weight loss at the final ecdysis. The relative growth rate did not remain constant, but declined during development. The decline is associated with a decline in honeydew production per unit body weight. The implications of an inconstant relative growth rate and the marked loss in weight at the adult moult in alates are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190662
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  • 5
    Electronic Resource
    Electronic Resource
    Detoxification of cereal plant allelochemicals by aphids: Activity and molecular weights of glutathioneS-transferase in three species of cereal aphids (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 387-394 
    Details
    ISSN: 1573-1561
    Keywords: Grain aphid ; Sitobion avenae ; Metopolophium dirhodum ; Rhopalosiphum padi ; Homoptera ; Aphididae ; detoxifying enzymes ; glutathioneS-transferase ; resistance ; cereal allelochemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The activity and molecular weights of glutathioneS-transferase were studied in three species of cereal aphid:Metopolophium dirhodum, Sitobion avenae, andRhopalosiphum padi. The highest level of glutathioneS-transferase activity was recorded in extracts fromM. dirhodum and the lowest fromS. avenae, and extracts of larvae were more active than those from adults. The activity of this enzyme was higher in extracts ofS. avenae andR. padi previously fed on a moderately resistant wheat variety than on a susceptible variety. Gel filtration followed by SDS-PAGE revealed three protein bands in the active fractions. The first had a molecular weight of 28,500 and the second of 27,500 and were present in all three species of aphid. The third protein differed in the three species, having a molecular weight of 26,000 inS. avenae, 25,500 inM. dirhodum, and 24,000 inR. padi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064445
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