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SUMMARY

  • 1
    Even when reared under similar conditions of crowding and nutrition, first and second generation adult sycamore aphids differ in their morphology and physiology. Second generation adults have a smaller abdomen, a longer gut, greater fat reserves, less developed gonads, a longer reproductive diapause and live longer than first generation aphids.
  • 2
    Second generation nymphs reared in isolation develop into adults which have less well-developed gonads but a reproductive delay similar to that of first generation adults.
  • 3
    Crowding of second generation adults prolongs the reproductive diapause.