Oecologia

, Volume 95, Issue 1, pp 89–92 | Cite as

The role of food quality and competition in shaping the seasonal cycle in the reproductive activity of the sycamore aphid

  • A. F. G. Dixon
  • P. W. Wellings
  • C. Carter
  • J. F. A. Nichols
Original Papers

Abstract

The hypothesis that seasonal changes in sycamore aphid,Drepanosiphum platanoidis (Schr.), recruitment are determined by changes in food quality and aphid population density was tested. There was no clear association between the reproductive activity of the sycamore aphid and the seasonal changes in specific amino acids or groups of amino acids in extracts of sycamore,Acer pseudoplatanus L., leaves. Seasonal changes in reproductive activity tracked the changes in total amino acids of the leaf tissue of the host, but with a short time delay. High numbers of adult aphids appeared to depress reproductive activity. A regression analysis of the results revealed that total amino acids the previous week and current numbers of adult aphids significantly affected sycamore aphid reproductive activity. The results of this analysis support the above hypothesis, that the marked seasonal changes in the total quantity of amino acids in sycamore leaves and intraspecific competition for this resource, through its effect on adult weight, shape the seasonal cycle in the reproductive activity of the sycamore aphid.

Key words

Drepanosiphum platanoidis Acer pseudoplatanus Sycamore aphid Intraspecific competition Reproductive activity 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • A. F. G. Dixon
    • 1
  • P. W. Wellings
    • 1
  • C. Carter
    • 2
  • J. F. A. Nichols
    • 2
  1. 1.School of Biological SciencesUniversity of East AngliaNorwichUK
  2. 2.Forest Research StationForestry CommissionFarnhamUK
  3. 3.CSIRO Division of EntomologyCanberraAustralia

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