An integrated experimental and mathematical approach to inferring the role of food exploitation and interference interactions in shaping life history

Joncour, Barbara; Nelson, William A.; Pak, Damie; Bjørnstad, Ottar N.

doi:10.1111/1365-2435.14022

Cited by 3 publications

(10 citation statements)

References 56 publications

(112 reference statements)

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“…To test the hypothesis that ad lib food is masking fitness costs, we raised animals from both susceptible and resistant strains under food constraints that were sufficient to severely impact their development and reproduction. 22 In fact, the pupal sizes that we observed under the most restrictive diet (Fig. 5) were slightly below the minimum pupal size in the field (∼10 mg; Y. Sato, personal communication).…”

Section: Discussionmentioning

confidence: 61%

“…Bughio and Wilkins 31 also found changes in the gut physiology of malathion‐resistant Tribolium castaneum that did not exhibit fitness costs. To test the hypothesis that ad lib food is masking fitness costs, we raised animals from both susceptible and resistant strains under food constraints that were sufficient to severely impact their development and reproduction 22 . In fact, the pupal sizes that we observed under the most restrictive diet (Fig.…”

Section: Discussionmentioning

confidence: 96%

“…Animals were isolated at birth into 1.5‐oz (43‐mL) translucent plastic cups (Dart Container P150N) and randomly assigned onto one of three diets. These diets corresponded to dry mass of 10, 3.3, and 1.3 mg day −1 , the latter two of which were shown to negatively impact development and survival 22 . Food was prepared by mixing one part dehydrated food to three parts distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…These diets corresponded to dry mass of 10, 3.3, and 1.3 mg day −1 , the latter two of which were shown to negatively impact development and survival. 22 Food was prepared by mixing one part dehydrated food to three parts distilled water. Containers also contained a 1.5-mL centrifuge-tube filled with water (1 mL) and stoppered with a cotton to ensure that the inside of containers remains humid.…”

Section: Food Limitation Experimentsmentioning

confidence: 99%

“…Development time increased as food level decreased as expected, and females took longer to develop, as observed previously. 22 When food was abundant, the resistant strain had a development time that was 1 day slower than the susceptible strain. When food was restricted, the difference disappeared and both strains had similar development times.…”

Section: Cost Of Resistancementioning

confidence: 99%

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No life‐history cost of tebufenozide resistance in the smaller tea tortrix moth

Lee

Smith

Nelson

et al. 2023

Pest Management Science

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BACKGROUND: Tebufenozide is widely used to control populations of the smaller tea tortrix, Adoxophyes honmai. However, A. honmai has evolved resistance such that straightforward pesticide application is an untenable long-term approach for population control. Evaluating the fitness cost of resistance is key to devising a management strategy that slows the evolution of resistance.RESULTS: We used three approaches to assess the life-history cost of tebufenozide resistance with two strains of A. honmai: a tebufenozide-resistant strain recently collected from the field in Japan and a susceptible strain that has been maintained in the laboratory for decades. First, we found that the resistant strain with standing genetic variation did not decline in resistance in the absence of insecticide over four generations. Second, we found that genetic lines that spanned a range of resistance profiles did not show a negative correlation between their LD 50 , the dosage at which 50 % of individuals died, and life-history traits that are correlates of fitness. Third, we found that the resistant strain did not manifest life-history costs under food limitation. Our crossing experiments indicate that the allele at an ecdysone receptor locus known to confer resistance explained much of the variance in resistance profiles across genetic lines. CONCLUSION: Our results indicate that the point mutation in the ecdysone receptor, which is widespread in tea plantations in Japan, does not carry a fitness cost in the tested laboratory conditions. The absence of a cost of resistance and the mode of inheritance have implications for which strategies may be effective in future resistance management efforts.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Food Limitation Experimentsmentioning

confidence: 99%

Section: Cost Of Resistancementioning

confidence: 99%

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No life‐history cost of tebufenozide resistance in the smaller tea tortrix moth

Lee

Smith

Nelson

et al. 2023

Pest Management Science

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Understanding an ecological tug of war: Disentangling competition between native and domesticated ungulates

Spencer,

DeYoung,

Foley

et al. 2024

Ecosphere

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Competition is a complex ecological process involving individual and community interactions at ecological and evolutionary time scales. Individuals within and between species can compete through two mechanisms: exploitative and interference competition. These mechanisms often co‐occur, making it difficult to develop a mechanistic understanding of competition. We used movement data from 19 GPS‐collared white‐tailed deer (Odocoileus virginianus) associated with an experimental cattle (Bos taurus) stocking event to disentangle exploitative from interference competition between deer and cattle. We assumed any effect of exploitative competition on reduced forage availability for deer would not occur immediately, whereas interference competition would occur immediately after cattle stocking, and antagonistic interactions between deer and cattle would alter deer behavior and degrade habitat quality. We evaluated the effects of the experimental stocking event on deer for 30‐day intervals before and after the cattle stocking event as this period was assumed to be too short for cattle to reduce deer forage resources through exploitative competition. We assessed the effects of interference competition using the movement metrics of home range size, speed, and resource selection. We used home range size as a proxy for habitat quality, assuming cattle would degrade deer habitat through means other than loss of forage. We used speed and resource selection as indicators of deer behavior. We experimentally stocked cattle at densities ranging from 0 to 15.7 animal units/km2 to previously destocked pastures. Stocking densities did not influence home range sizes ( = 17.033, 85% CI: −189.471 to 235.322) of deer. However, as stocking density increased, deer decreased speed ( = −0.014, 85% CI: −0.020 to −0.008) and increased selection for woody cover ( = 0.047, 85% CI: 0.031 to 0.063) and sandier soils ( = 0.062, 85% CI: 0.033 to 0.090). Our results suggest cattle density altered deer behavior and their realized niche within our system. Our results demonstrated mechanisms by which competition with livestock could influence native wildlife populations, which can be used to inform management of multiuse working landscapes.

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Data and Rscripts from: An integrated experimental and mathematical approach to inferring the role of food exploitation and interference interactions in shaping life history

Joncour,

Nelson,

Pak

et al. 2021

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An integrated experimental and mathematical approach to inferring the role of food exploitation and interference interactions in shaping life history

Cited by 3 publications

References 56 publications

No life‐history cost of tebufenozide resistance in the smaller tea tortrix moth

No life‐history cost of tebufenozide resistance in the smaller tea tortrix moth

Understanding an ecological tug of war: Disentangling competition between native and domesticated ungulates

Data and Rscripts from: An integrated experimental and mathematical approach to inferring the role of food exploitation and interference interactions in shaping life history

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