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Timing of Egg Hatch and Viability of the Sycamore Aphid, Drepanosiphum platanoidis (Schr.), at Bud Burst of Sycamore, Acer pseudoplatanus L.
A. F. G. Dixon
Journal of Animal Ecology
Vol. 45, No. 2 (Jun., 1976), pp. 593-603
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/3893
Page Count: 11
You can always find the topics here!Topics: Eggs, Leaves, Leaf buds, Mortality, Branches, Saplings, Hatching, Birds, Viability, Bark
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(1) Most sycamore aphid eggs are laid in crevices in bark at distances greater than 50 cm from a terminal bud. (2) Differences in the timing of egg hatch from year to year and the pattern of egg hatch within a year can be attributed to differences in temperature. Egg hatch and bud burst do not occur at the same time relative to one another each year. The distribution of egg hatch in time is similar to the distribution of bud burst in time between trees. (3) The longer the period between egg hatch and bud burst the fewer aphids survive to colonize the leaves. Both birds and rain are implicated as causal factors in the disappearance of aphids from the buds. (4) The advantage to aphids of hatching at bud burst is that in feeding on the unfurling leaves aphids can achieve twice the adult weight and their offspring can mature more quickly and achieve a greater size than aphids that emerge after bud burst.
Journal of Animal Ecology © 1976 British Ecological Society