Journal article
Contrast in Post-Chill Eclosion Time Strategies Between Two Specialist Braconid Wasps (Hymenoptera: Braconidae) Attacking Rhagoletis Flies (Diptera: Tephritidae) in Western North America
Environmental entomology, Vol.50(5), pp.1173-1186
08/13/2021
DOI: 10.1093/ee/nvab080
PMID: 34387323
Abstract
Parasitoids comprise a speciose insect group, displaying a wide array of life history strategies. In the Pacific Northwest of the United States, the tephritid fruit flies Rhagoletis tabellaria (Fitch) and Rhagoletis indifferens Curran infest red osier dogwood, Cornus sericea L. (Cornaceae), and bitter cherry, Prunus emarginata (Douglas ex Hooker) Eaton (Rosaceae), respectively. The flies are parasitized by different braconid wasps at different life stages; Utetes tabellariae (Fischer) oviposits into R. tabellaria eggs, whereas Diachasma muliebre (Muesebeck) oviposits into R. indifferens larvae feeding in cherries. Because Rhagoletis only have one major generation a year and the wasps attack temporally distinct fly life stages, we predicted that eclosion times of U. tabellariae should more closely follow that of its host than the larval-attacking D. muliebre. As predicted, U. tabellariae eclosed on average 6.0–12.5 d later than R. tabellaria, whereas D. muliebre eclosed on average 32.1 d after R. indifferens. Unexpectedly, however, longer chill duration differentially affected the systems; longer overwinters minimally influenced eclosion times of R. tabellaria and U. tabellariae but caused earlier eclosion of both R. indifferens and D. muliebre. Results imply that in temperate regions, diapause timing in braconid wasps evolves in response to both host life stage attacked and fly eclosion characteristics, possibly reflecting differential effects of winter on host plant fruiting phenology. Differences in phenological sensitivity of the lower host plant trophic level to variation in environmental conditions may have cascading effects, sequentially and differentially affecting eclosion times in higher frugivore (fly) and parasitoid (wasp) trophic levels.
Details
- Title: Subtitle
- Contrast in Post-Chill Eclosion Time Strategies Between Two Specialist Braconid Wasps (Hymenoptera: Braconidae) Attacking Rhagoletis Flies (Diptera: Tephritidae) in Western North America
- Creators
- Wee L Yee - USDA-ARS, Temperate Tree Fruit and Vegetable Research Unit, 5230 Konnowac Pass Rd, Wapato, WA 98951, USAAndrew A Forbes - Department of Biology, The University of Iowa, Iowa City, IA 52242, USAJeffrey L Feder - Department Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
- Resource Type
- Journal article
- Publication Details
- Environmental entomology, Vol.50(5), pp.1173-1186
- Publisher
- Entomological Society of America
- DOI
- 10.1093/ee/nvab080
- PMID
- 34387323
- ISSN
- 0046-225X
- eISSN
- 1938-2936
- Number of pages
- 14
- Language
- English
- Date published
- 08/13/2021
- Academic Unit
- Biology; University College Courses
- Record Identifier
- 9984217528302771
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