Evolution of critical photoperiod in codling moths subject to the sterile insect technique
department or school: Science, Irving K. Barber Faculty of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Chambers, Ian
issued: 2023-05-29T19:25:26Z
issued: 2023
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Codling moth is an invasive species in Canada that damages pomme fruit crops across the globe and has proven difficult to manage through the use of chemical sprays and the sterile insect technique (SIT). In my research I examine how codling moth populations may be evolving under the SIT to avoid management pressures. Photoperiod dictates the onset of diapause in codling moths and the SIT may be causing a change in the timing of diapause across wild populations by selecting for specific critical photoperiods. Previous modelling of the SIT has failed to address how diapause might be affecting the efficacy of the SIT. Furthermore, no one has examined if the critical photoperiod distribution of a population, and therefore the mean timing of diapause, in wild codling moth populations might change under the selection pressure exerted by the SIT. I hypothesize that the SIT as is being applied in the Okanagan Valley, selects for longer critical photoperiods in wild codling moths, causing them to enter diapause earlier in the year and avoid the higher SIT pressures present in the warmer months of the summer. I developed two mathematical models incorporating the SIT and diapause as a function of critical photoperiod to investigate how the distribution of critical photoperiod within a population may evolve under the SIT. This approach aims to help understand why the SIT has not led to eradication of codling moths as originally predicted, and contribute to future management efforts. I find that the SIT may be selecting for longer critical photoperiods, causing a higher proportion of the population to enter diapause after the first generation.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/84715
note: Evolution of Critical Photoperiod inCodling Moths Subject to the SterileInsect TechniquebyIan ChambersB.Sc., The University of British Columbia, 2016A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFMASTER OF SCIENCEinThe College of Graduate Studies(Interdisciplinary Studies)(Sustainability)THE UNIVERSITY OF BRITISH COLUMBIA(Okanagan)May 2023© Ian Chambers 2023The following individuals certify that they have read, and recommendto the College of Graduate Studies for acceptance, a thesis/dissertation en-titled:Evolution of Critical Photoperiod in Codling Moths Subject to the SterileInsect Techniquesubmitted by Ian Chambers in partial fulfillment of the requirements forthe degree of Master of Science in Interdisciplinary Studies SustainabilityDr. Rebecca Tyson, Irving K. Barber School of Arts and SciencesSupervisorDr. Gary Judd, Agriculture and Agri-Food CanadaSupervisory Committee MemberDr. Robert Lalonde, Irving K. Barber School of Arts and SciencesSupervisory Committee MemberDr. Michael Noonan, Irving K. Barber School of Arts and SciencesUniversity ExamineriiAbstractCodling moth is an invasive species in Canada that damages pomme fruitcrops across the globe and has proven difficult to manage through the useof chemical sprays and the sterile insect technique (SIT). In my research Iexamine how codling moth populations may be evolving under the SIT toavoid management pressures. Photoperiod dictates the onset of diapause incodling moths and the SIT may be causing a change in the timing of dia-pause across wild populations by selecting for specific critical photoperiods.Previous modelling of the SIT has failed to address how diapause might beaffecting the efficacy of the SIT. Furthermore, no one has examined if thecritical photoperiod distribution of a population, and therefore the meantiming of diapause, in wild codling moth populations might change underthe selection pressure exerted by the SIT. I hypothesize that the SIT as isbeing applied …
has type: Thesis/Dissertation
date issued: 2019-09
is shown at: 10.14288/1.0432736
language: eng
degree discipline: Interdisciplinary Studies
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nd/4.0/
scholar level: Graduate
contributor: Tyson, Rebecca
type: Text
identifier URI: http://hdl.handle.net/2429/84715