Premium
Maternal age as a source of variation in the ability of an aphid to produce dispersing forms
Author(s) -
MacKay Patricia A.,
Wellington W. G.
Publication year - 1976
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02754093
Subject(s) - alate , biology , aphid , acyrthosiphon pisum , offspring , crowding , biological dispersal , zoology , demography , aphididae , ecology , botany , pest analysis , homoptera , pregnancy , genetics , population , neuroscience , sociology
Summary Apterous parthenogentic females of the pea aphid, Acyrthosiphon pisum ( Harris ), begin to produce alate offspring soon after they have been subjected to crowding. Females which were born early in their own parent's reproductive period respond most strongly to crowding, producing much larger numbers of alatae than their late‐born sisters. In contrast, the early‐born daughters of most alate females do not produce winged offspring after being crowded. Some of their later‐born sisters may produce a few winged individuals, resembling in this respect the late‐born daughters of the apterous females. Control of the production of alatae thus begins in the grandparental generation. Risk‐spreading by means of differential dispersal becomes a less uncertain venture when local populations can modify their responses to environmental changes by utilizing past as well as present signals from their surroundings.