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Data from: An artificial delay in emergence influences the number but not the fitness of adult emerald ash borer emerging from infested ash wood
Fick, William E.; MacQuarrie, Chris J.K.; MacQuarrie, Chris J. K. — 2018-12-04 Emerald ash borer, Agrilus planipennis Fairmaire (Buprestidae) is the most significant invasive forest pest in North America. Laboratory research on this species requires a source of adult and larval insects that are of the same fitness as those present in the wild. Production of adult emerald ash borer relies on flushing adults from logs which are subject to cold storage for some period prior to use. The effect of this storage on the number of insects emerging or the fitness of those that emerge has not been investigated. We subjected logs of EAB-infested white ash, Fraxinus americana L. to 7–14 month of cold storage and quantified the number of insects that emerged, time to emergence, and the body condition of adults as a measure of fitness. Body condition was evaluated using Soxhlet fat extraction and water weight. No published methods for Soxhlet fat extraction were available for this species so we developed extraction protocols. The number of insects emerging decreased with time, but fitness (i.e., fat content, water content) did not decrease. Time to emergence did increase but only in the longest-storage treatment while a comparison of male versus female emergence provides evidence for protandry in emerald ash borer. Rearing programs for emerald ash borer using wood from cold storage should adjust the amount used to produce a given number of insects but the quality of those individuals emerging will not be affected. We suggest that those insects that perished during storage were of lower quality when entering diapause and thus would serve as poor-quality host in rearing programs for natural enemies of emerald ash borer. These data also provide evidence for one pathway of introduction for emerald ash borer, suggesting that refrigeration in transit was required for EAB to remain viable and establish its beachhead in North America. https://creativecommons.org/publicdomain/zero/1.0/
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Data from: Fitness dynamics within a poplar hybrid zone: II. Impact of exotic sex on native poplars in an urban jungle.
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Roe, Amanda D.; MacQuarrie, Chris J. K.; Gros-Louis, Marie-Claude; Simpson, J. Dale; Lamarche, Josyanne; Beardmore, Tannis; Thompson, Stacey L.; Tanguay, Philippe; Isabel, Nathalie; MacQuarrie, Chris J.K. — 2015-03-17 Trees bearing novel or exotic gene components are poised to contribute to the bioeconomy for a variety of purposes such as bioenergy production, phytoremediation, and carbon sequestration within the forestry sector, but sustainable release of trees with novel traits in large-scale plantations requires the quantification of risks posed to native tree populations. Over the last century, exotic hybrid poplars produced through artificial crosses were planted throughout eastern Canada as ornamentals or windbreaks and these exotics provide a proxy by which to examine the fitness of exotic poplar traits within the natural environment to assess risk of exotic gene escape, establishment, and spread into native gene pools. We assessed postzygotic fitness traits of native and exotic poplars within a naturally regenerated stand in eastern Canada (Quebec City, QC). Pure natives (P. balsamifera and P. deltoides spp. deltoides), native hybrids (P. deltoides × P. balsamifera), and exotic hybrids (trees bearing Populus nigra and P. maximowiczii genetic components) were screened for reproductive biomass, yield, seed germination, and fungal disease susceptibility. Exotic hybrids expressed fitness traits intermediate to pure species and were not significantly different from native hybrids. They formed fully viable seed and backcrossed predominantly with P. balsamifera. These data show that exotic hybrids were not unfit and were capable of establishing and competing within the native stand. Future research will seek to examine the impact of exotic gene regions on associated biotic communities to fully quantify the risk exotic poplars pose to native poplar forests.

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(auteur : MacQuarrie, Chris J.K.)

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