Variability in spruce beetle (Coleoptera: Curculionidae, Scolytinae) adult diapause and evidence for oocyte development prior to winter in a Colorado population DOI
Marianne Davenport, Barbara Bentz, E. Matthew Hansen

et al.

Environmental Entomology, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 25, 2024

Abstract Diapause regulates seasonal insect life cycles and may be highly variable within among populations due to genetic environmental variability. Both types of variation influence how respond plastically or evolutionarily changing climates. We assessed diapause variability in spruce beetle Dendroctonus rufipennis Kirby (Coleoptera: Curculionidae, Scolytinae), a major forest pest whose cycle timing is regulated by both prepupal adult diapauses. Using mating studies ovary dissections, we tested for between collection sites Colorado Wyoming, USA. Ovary morphology suggested that most females from enter prior egg formation (oogenesis) when reared at warm temperatures. Though previous obligate, found small proportion terminated without winter chilling the lab. Moreover, female beetles sampled field site had mature ovaries relatively early fall, suggesting transient exposure low temperatures potentiate pre-winter reproductive development. Adult act primarily as block prevent offspring production late season but not necessarily an overwintering phenotype. Overall, our data do suggest imminent shifts mediated diapause, if observed heritable, regulation evolve response conditions.

Language: Английский

A quantitative model of temperature-dependent diapause progression DOI Creative Commons
Loke von Schmalensee, Philip Süess, Kevin T. Roberts

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(36)

Published: Aug. 28, 2024

Winter diapause in insects is commonly terminated through cold exposure, which, like vernalization plants, prevents development before spring arrives. Currently, quantitative understanding of the temperature dependence termination limited, likely because phenotypes are generally cryptic to human eyes. We introduce a methodology tackle this challenge. By consecutively moving butterfly pupae species Pieris napi from several different conditions 20 °C, we show that proceeds as temperature-dependent rate process, with maximal rates at relatively temperatures and low warm extremely temperatures. Further, resulting thermal reaction norm can predict P. timing under variable Last, once , subsequent follows typical performance curve, around 31 °C minimum 2 °C. The sequence these thermally distinct processes (diapause postdiapause development) facilitates synchronous eclosion nature; microclimates where progresses quickly do not promote fast development, allowing individuals warmer winter catch up, vice versa. unveiling one process among others promotes parsimonious, quantitative, predictive model, wherein functions both an adaptation against premature during fall for synchrony spring.

Language: Английский

Citations

8
Conserved cold tolerance of Rhagoletis species from different host fruits and elevations in Colorado, USA DOI Creative Commons

Katelyn Lemay,

Mackenzie Moore,

Paige Brown

et al.

Physiological Entomology, Journal Year: 2024, Volume and Issue: 49(3), P. 216 - 226

Published: April 25, 2024

Abstract Understanding and characterizing how insects tolerate low temperatures is important for predicting their overwintering survival subsequent geographic spread. This study characterized the cold tolerance of two members Rhagoletis genus (Diptera: Tephritidae) in Colorado, USA. Pupae were collected from infested fruits late summer early fall. For first time, we show that rosehip fly basiola Osten Sacken freeze‐avoidant; pupae could supercool to as −26°C survive. Interestingly, temperature at which ice forms (supercooling point; SCP) did not vary between R. high (c. 2900 m above sea level [m a.s.l.]) lower 1650 a.s.l.) elevations. We also report apple maggot pomonella Walsh infesting an unusual host fruit, Dolgo crabapple, close proximity hawthorn trees. crabapples had similar SCPs survived −21°C. both prolonged exposure (2 weeks or more) mild (0 −5°C). Further into mechanisms underlying impressive conserved interesting avenue future research.

Language: Английский

Citations

7
Diapause survival requires a temperature-sensitive preparatory period DOI Creative Commons
Amanda D. Roe, Ashlyn A. Wardlaw,

Skye Butterson

et al.

Current Research in Insect Science, Journal Year: 2024, Volume and Issue: 5, P. 100073 - 100073

Published: Jan. 1, 2024

Diapause is a form of internally-controlled dormancy that allows insects to avoid stressful conditions and periods low food availability. Eastern spruce budworm (

Language: Английский

Citations

4
Rhagoletis pomonella Pest Report to support the ranking of EU candidate priority pests DOI Open Access
Tramontini Sara, Eduardo de la Peña, Gianni Gilioli

et al.

EFSA Supporting Publications, Journal Year: 2025, Volume and Issue: 22(4)

Published: April 1, 2025

Abstract In 2022, EFSA was mandated by the European Commission's Directorate‐General for Health and Food Safety (M‐2022‐00070) to provide technical assistance on list of Union quarantine pests qualifying as priority pests, specified in Article 6(2) Regulation (EU) 2016/2031 protective measures against plant pests. As part Task C, conducted expert knowledge elicitations candidate focusing lag period, expansion rate impact production (yield quality losses) environment. This report provides rationale dataset Rhagoletis pomonella, delivered Joint Research Centre, feed into Impact Indicator Priority Pest (I2P2) model complete pest prioritisation ranking exercise.

Language: Английский

Citations

0
Variability in spruce beetle (Coleoptera: Curculionidae, Scolytinae) adult diapause and evidence for oocyte development prior to winter in a Colorado population DOI
Marianne Davenport, Barbara Bentz, E. Matthew Hansen

et al.

Environmental Entomology, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 25, 2024

Abstract Diapause regulates seasonal insect life cycles and may be highly variable within among populations due to genetic environmental variability. Both types of variation influence how respond plastically or evolutionarily changing climates. We assessed diapause variability in spruce beetle Dendroctonus rufipennis Kirby (Coleoptera: Curculionidae, Scolytinae), a major forest pest whose cycle timing is regulated by both prepupal adult diapauses. Using mating studies ovary dissections, we tested for between collection sites Colorado Wyoming, USA. Ovary morphology suggested that most females from enter prior egg formation (oogenesis) when reared at warm temperatures. Though previous obligate, found small proportion terminated without winter chilling the lab. Moreover, female beetles sampled field site had mature ovaries relatively early fall, suggesting transient exposure low temperatures potentiate pre-winter reproductive development. Adult act primarily as block prevent offspring production late season but not necessarily an overwintering phenotype. Overall, our data do suggest imminent shifts mediated diapause, if observed heritable, regulation evolve response conditions.

Language: Английский

Citations

0