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Population variability of three Delia species (Diptera: Anthomyiidae) from the same agricultural habitat in Québec, Canada

Published online by Cambridge University Press:  21 December 2017

Robert J. Lamb  and
Guy Boivin
Robert J. Lamb*
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Guy Boivin
Affiliation:
St-Jean-sur-Richelieu Research and Development Center, Agriculture and Agri-Food Canada, St-Jean-sur-Richelieu, Québec, J3B 3E6, Canada
*
1Corresponding author (e-mail: bob.lamb@mtsmail.ca)
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Abstract

Long-term trap catches of seedcorn maggot, Delia platura (Meigen), onion maggot, Delia antiqua (Meigen), and cabbage maggot, Delia radicum (Linnaeus) (Diptera: Anthomyiidae), were used to test the hypothesis that related species have more similar population variability than unrelated ones. Annual abundance was estimated from trap catches for 32 years (two species) or 17 years (one species). Population variability was quantified as PV, a proportion between 0 and 1. The three Delia Robineau-Desvoidy species had PV values of 0.51–0.55 that did not differ significantly. These PV values were found to differ significantly from two unrelated species studied over the same time period in the same habitat, which had PV values of 0.39 and 0.67. The hypothesis that related species have more similar population variabilities than unrelated species in the same habitat was supported. These data strengthen the view that PV is a species-specific trait reflecting the adaptation of life histories to their habitat, with related species showing more similar adaptations than unrelated species. The polyphagous and saprophagous seedcorn maggot had PV similar to the two oligophagous herbivores, casting doubt on the hypothesis that more generalist feeders have less variable populations than more specialised feeders.

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 150 , Issue 1 , February 2018 , pp. 80 - 86
Copyright
© Entomological Society of Canada 2017 

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Footnotes

Subject editor: Rob Johns

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