Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network

  Advanced Search  

Evolutionary Ecology Research, 2000, 2: 745759 2000 Donald G. Miller III

Summary: Evolutionary Ecology Research, 2000, 2: 745­759
© 2000 Donald G. Miller III
Sex ratio and brood size in a monophagous outcrossing
gall aphid, Tamalia coweni (Homoptera: Aphididae)
Donald G. Miller III1,2,3
* and Leticia Avilés2
Department of Biology, Trinity University, 715 Stadium Drive, San Antonio, TX 78212,
Department of Ecology and Evolutionary Biology and 3
Center for Insect Science,
University of Arizona, Tucson, AZ 85721, USA
Sex allocation theory has been applied successfully in the case of spatially structured aphid
populations, in which local mate competition can account for biased sex ratios. Likewise,
a demographic effects model can explain sex ratio bias when maternal investment in sons
and daughters is asynchronous, owing to developmental constraints. In one of the first studies
to examine patterns of sex allocation in a phytophagous insect in which outbreeding is likely
and both sexes are produced concurrently, we measure sex ratio and sex allocation for the
gall-forming aphid Tamalia coweni (Cockerell). While the sex ratio at a low elevation (800 m)


Source: Avilés, Leticia - Department of Zoology, University of British Columbia


Collections: Environmental Sciences and Ecology