Overwintering strategies and life-history traits of different populations of Aphidius platensis along a latitudinal gradient in Chile

Alfaro-Tapia, Armando; Alvarez-Baca, Jeniffer K.; Tougeron, Kévin; Lavandero, Blas; Lann, Cécile Le; Baaren, Joan van

doi:10.1127/entomologia/2021/1186

Cited by 15 publications

(4 citation statements)

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“…Body size has implications for energy reserve allocation and survival of cold stress (Colinet et al, 2006;Renault et al, 2003), so high elevation (smaller) R. basiola may have weaker chronic cold tolerance than their lower elevation counterparts. Given the broad geographic distribution of R. basiola, it would also be worth studying whether cold tolerance differs on a larger geographic scale, similar to other insects (Addo-Bediako et al, 2000;Alfaro-Tapia et al, 2021;Sunday et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Conserved cold tolerance ofRhagoletisspecies from different host fruits, elevations in Colorado, USA

Lemay,

Moore,

Brown

et al. 2023

Preprint

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

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Section: Discussionmentioning

confidence: 99%

Conserved cold tolerance ofRhagoletisspecies from different host fruits, elevations in Colorado, USA

Lemay,

Moore,

Brown

et al. 2023

Preprint

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“…In this study, we refer to these as ‘non-diapause’ phenotypes (Calvert et al, 2022; Dambroski and Feder, 2007; Toxopeus et al, 2021). In mild winter climates, these non-diapause insects may be winter active (Alfaro-Tapia et al, 2021; Tougeron et al, 2017). Exposure to warm conditions prior to winter can also cause insects to remain in diapause for only a short duration, a phenotype which is commonly referred to as ‘weak diapause’ (Toxopeus et al, 2021) or ‘shallow diapause’ (Calvert et al, 2022; Dambroski and Feder, 2007).…”

Section: Introductionmentioning

confidence: 99%

Cold tolerance and diapause within and across trophic levels: endoparasitic wasps and their fly host have similar phenotypes

McIntyre

Andaloori

Hood

et al. 2023

Preprint

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Low temperatures associated with winter can limit the survival of organisms, especially ectotherms whose body temperature is similar to their environment. Important adaptations for overwintering such as cold hardiness and diapause have been well-explored in many insect taxa. However, there is a gap in understanding how overwintering may vary among groups of species that interact closely, such as multiple parasitoid species that attack the same host insect. Our study investigated cold tolerance and diapause phenotypes in three endoparasitoid wasps of the apple maggot fly Rhagoletis pomonella (Diptera: Tephritidae): Utetes canaliculatus, Diachasma alloeum, and Diachasmimorpha mellea (Hymenoptera: Braconidae). Using a combination of respirometry and eclosion tracking, we detected diapause phenotypes in all three wasp species, remarkably similar to the fly host. Weak diapause was rare (< 5%) in all three wasp species, and while most D. mellea (93%) entered prolonged diapause under warm conditions, the majority of U. canaliculatus (92%) and D. alloeum (72%) averted diapause (non-diapause). There was limited interspecific variation in acute cold tolerance among the three wasp species: wasps and flies had similarly high survival (>87%) following exposure to extreme low temperatures (-20 degrees Celsius) as long as their body fluids did not freeze. The wasp species showed little interspecific variation in survival following prolonged exposure to mild chilling of 8 or more weeks at 4 degrees Celsius. This study shows remarkable conservation of cold tolerance and diapause phenotypes within and across trophic levels. The interaction between diapause phenotype and cold hardiness in these parasitoids is an interesting direction for future research.

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“…Insect diapause is a dynamic process consisting of several continuous phases: pre-diapause (diapause induction and diapause preparation), diapause (diapause initiation, diapause maintenance, and diapause termination), and post-diapause development (resume development after diapause termination). Diapause is induced only when particular environmental thresholds are reached [ 16 , 17 , 18 ]. In Trichogramma , almost all the species enter a facultative diapause as prepupa depending on the prevailing environmental conditions [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Gradually Increasing the Temperature Reduces the Diapause Termination Time of Trichogramma dendrolimi While Increasing Parasitoid Performance

Zhang

Monticelli

et al. 2022

Insects

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Trichogramma dendrolimi Matsumura is widely used as a biological control agent of many lepidopteran pests. Diapause has been used as an effective method to preserve the Trichogramma products during mass rearing production. However, it currently takes at least 70 days to break diapause, and we tested whether gradually increasing the temperature instead of using constant temperature could reduce the time of diapause termination and offer a higher flexibility to Trichogramma producers. The diapause termination rates of individuals kept at different conditions were measured, and five groups for which diapause termination rate reached the 95% were selected to test five biological parameters, including the number of eggs parasitized, the parasitism and emergence rates, the female sex ratio, the wing deformation rate, and the parasitoid longevity. Compared to the currently used procedure (70 days at 3 °C), treatments with at least two different temperatures resulted in higher parasitism and emergence rates while keeping the other parameters constant. The treatment that consisted of at least two different temperatures preceded by only 55 days of induction period had the highest population trend index, meaning that the population under these conditions grows more rapidly. Our results demonstrate that gradually increasing temperature allows T. dendrolimi to complete diapause earlier than at present while increasing its potential pest control capacity and providing additional flexibility in mass production of T. dendrolimi.

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Overwintering strategies and life-history traits of different populations of Aphidius platensis along a latitudinal gradient in Chile

Cited by 15 publications

References 0 publications

Conserved cold tolerance ofRhagoletisspecies from different host fruits, elevations in Colorado, USA

Conserved cold tolerance ofRhagoletisspecies from different host fruits, elevations in Colorado, USA

Cold tolerance and diapause within and across trophic levels: endoparasitic wasps and their fly host have similar phenotypes

Gradually Increasing the Temperature Reduces the Diapause Termination Time of Trichogramma dendrolimi While Increasing Parasitoid Performance

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