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Population variability of a native and an introduced herbivore of carrots (Apiaceae)

Published online by Cambridge University Press:  11 August 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 Agrifood Canada, St-Jean-sur-Richelieu, Québec, J3B 3E6, Canada
*
1Corresponding author (email: [email protected])
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Abstract

Long-term, twice weekly, trap catches of the native carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), and the introduced carrot rust fly, Psila rosae (Fabricius) (Diptera: Psilidae), were used to test the hypothesis that native populations fluctuate less from year-to-year than those of introduced species, because the native species has had more time to adapt to temporal variability in its habitat than an introduced species. Variability in annual abundance was estimated for 33 years, and for 11-year or 16–17-year subsets of the 33-year time series. Temporal population variability was quantified as PV, a proportion between 0 and 1. The native carrot weevil had a PV of 0.39, less than that of the introduced carrot rust fly with a PV of 0.67, supporting the hypothesis. Generation 1 for both species showed a decline in PV over three decades consistent with the hypothesis that adaptation to variability in the habitat leads to lower PV. Over 33 years, the carrot weevil developed a second generation with a PV of 0.70, higher than that of the first generation, which is consistent with the hypothesis that adaptation is required to stabilise population dynamics in a new habitat, in this case a new temporally defined habitat.

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 149 , Issue 5 , October 2017 , pp. 592 - 599
Copyright
© Entomological Society of Canada 2017 

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Footnotes

Subject editor: Rob Johns

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