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Geographic and clonal variation in the milkweed-oleander aphid,Aphis nerii (Homoptera: Aphididae), for winged morph production, life history, and morphology in relation to host plant permanence

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Summary

Populations of the milkweed-oleander aphid,Aphis nerii, were sampled in California, Iowa and Puerto Rico. Among these localities the aphid's host plants differ greatly in permanence. I compared populations for migratory potential, measured as the proportion of winged offspring produced in response to being crowded, and for life history and morphometric traits of the subsequent adult winged aphids. I predicted a negative correlation between degree of host plant permanence and migratory potential. As predicted, aphids from Iowa, where migration on to temporary hosts must occur each year, produce a greater proportion of winged offspring (37.7%) than those from California (25.7%) or Puerto Rico (31.6%) where hosts are more permanent. However, hosts in Puerto Rico appear to be more permanent than those in California, yet the difference between populations for migratory potential was opposite to that predicted. Within California the prediction again held: aphids collected from the most impermanent sites produce the greatest proportion of winged offspring. There were no population differences for any life history or morphometric traits of winged aphids that are important contributors to fitness or migratory ability such as time to reproductive maturity, fecundity or wing length. Nor did any traits covary with migratory potential. Thus, there does not appear to be an association of life history and morphology with migratory potential that could enhance the colonizing ability of migrant aphids. I was unable to detect population differentiation for life history and morphology even though there is ample genetic variation within populations on which selection could act and an absence of constraints arising from genetic correlations that could prevent appropriate evolution of traits within populations. The exploitation of temporary host plants therefore occurs by an increase in the number of colonists produced and not by change in life history or morphology of those colonists.

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Author notes

  1. Francis R. Groeters

    Present address: Molecular and Population Genetics Group, Research School of Biological Sciences, The Australian National University, PO Box 475, 2601, Canberra, ACT, Australia

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  1. Department of Zoology, University of California, 95616, Davis, CA, USA

    Francis R. Groeters

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Groeters, F.R. Geographic and clonal variation in the milkweed-oleander aphid,Aphis nerii (Homoptera: Aphididae), for winged morph production, life history, and morphology in relation to host plant permanence. Evol Ecol 3, 327–341 (1989). https://doi.org/10.1007/BF02285263

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