Prolonged diapause: A trait increasing invasion speed?

Mahdjoub, Tewfik; Menu, Frédéric

doi:10.1016/j.jtbi.2007.12.002

Cited by 22 publications

(16 citation statements)

References 47 publications

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“…Prolonged diapause is a major trait for insect population dynamics, especially in fluctuating environments [14], [15]. Recently, low frequency of prolonged diapause (0.1–0.2) has been shown to maximize invasion speed in a stochastic environment by increasing population stochastic growth rate, suggesting that this trait may be advantageous for introduced populations during the colonization phase in such an environment [20]. Our study of 97 different cohorts of M. schimitscheki estimated a mean frequency of prolonged diapause of 0.16 (±2.1) between 1999 and 2008.…”

Section: Discussionmentioning

confidence: 99%

“…Our study of 97 different cohorts of M. schimitscheki estimated a mean frequency of prolonged diapause of 0.16 (±2.1) between 1999 and 2008. Accordingly to Mahjoub and Menu [20], such a propensity to prolonged diapause could have contributed to population establishment by compensating for demographic and dispersal costs in their new environment.…”

Section: Discussionmentioning

confidence: 99%

“…The role of prolonged diapause as a demographic refuge in fluctuating environments has been demonstrated empirically and theoretically when the variability of diapause duration decreases population extinction risks due to unpredictable catastrophic events such as sudden limitation in food resource, enhanced predation, or pathogenic risks [12], [15], [19]. Indeed, prolonged diapause has been shown to increase the mean population growth rate in a stochastic environment, which may even facilitate the spreading phase of invasive populations when stochasticity is high [20]. Prolonged diapause may also contribute to the stability and persistence of coupled host-parasitoid interactions [11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temporal Population Genetics of Time Travelling Insects: A Long Term Study in a Seed-Specialized Wasp

et al. 2013

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Many animal species experiencing spatial or interannual fluctuations of their environment are capable of prolonged diapause, a kind of dormancy that extends over more than one year. Such a prolonged diapause is commonly perceived as a temporal demographic refuge in stochastic environments, but empirical evidence is still lacking of its consequences on temporal population genetic structures. In this long-term study, we investigated how a particular pattern of prolonged diapause may influence the temporal population genetics of the invasive seed-specialized wasp Megastigmus schimitscheki (Hymenoptera: Torymidae) in southeastern France. We characterized the diapause strategy of M. schimitscheki using records of emergence from diapause in 97 larval cohorts, and we conducted a temporal population genetic study on a natural invasive wasp population sampled during ten consecutive years (1999–2008) using polymorphic microsatellite markers. We found that M. schimitscheki can undergo a prolonged diapause of up to five years and displays two main adult emergence peaks after two and four years of diapause. Such a bimodal and atypical pattern did not disrupt temporal gene flow between cohorts produced in even and in odd years during the period of the study. Unexpectedly, we found that this wasp population consisted of two distinct genetic sub-populations that strongly diverged in their diapause strategies, with very few admixed individuals. One of the sub-populations displayed both short and prolonged diapause (2 and 4 years respectively) in equal proportions, whereas the other sub-population displayed mainly short diapause. This study provided empirical evidence that prolonged diapause phenotypes can substantially contribute to reproduction and impact temporal genetic structures. Prolonged diapause is likely to act as both demographic and genetic refuges for insect populations living in fluctuating environments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal Population Genetics of Time Travelling Insects: A Long Term Study in a Seed-Specialized Wasp

et al. 2013

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“…For example, temperature affects the larval developmental rates of many insects, which could significantly influence the relationship between larval density (host stress level) and development time observed for A. planipennis (see Appendix B in ESM). Variation in diapause (or dormancy) has been proposed to be a factor increasing invasion success in stochastic environments as a bet hedging strategy (e.g., Menu et al 2000;Chen et al 2006;Mahdjoub and Menu 2008). However, using integro-difference deterministic and low variability stochastic models, Mahdjoub and Menu (2008) indicated a significant decrease in spread rate with increasing duration of diapause.…”

Section: Radius Of Infestation (M)mentioning

confidence: 99%

Influence of foraging behavior and host spatial distribution on the localized spread of the emerald ash borer, Agrilus planipennis

et al. 2010

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Management programs for invasive species are often developed at a regional or national level, but physical intervention generally takes place over relatively small areas occupied by newly founded, isolated populations. The ability to predict how local habitat variation affects the expansion of such newly founded populations is essential for efficiently targeting resources to slow the spread of an invasive species. We assembled a coupled map lattice model that simulates the local spread of newly founded colonies of the emerald ash borer (Agrilus planipennis Fairmaire), a devastating forest insect pest of ash (Fraxinus spp.) trees. Using this model, we investigated the spread of A. planipennis in environments with different Fraxinus spp. distributions, and explored the consequences of ovipositional foraging behavior on the local spread of A. planipennis. Simulations indicate that increased larval density, resulting from lower host tree density or higher initial population sizes, can increase the spread rate during the first few years after colonization by increasing a density-dependent developmental rate and via host resource depletion. Both the radial spread rate and population size were greatly influenced by ovipositional foraging behavior. Two known behaviors of ovipositing A. planipennis females, attraction towards areas with high ash tree density and attraction to stressed trees, had opposing effects on spread. Results from this model illustrate the significant influence of resource distribution and foraging behavior on localized spread, and the importance of these factors when formulating strategies to monitor and manage invasive pests.

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“…Early or late emergence timing allows some insects to avoid peaks of parasitoid emergence or predator activity (Thireau & Régnière, ; Stoks et al , ); however, this may be an unlikely strategy for the swede midge because few natural enemies of swede midge are found in Europe or North America (Corlay et al , ; Abram et al , ). Prolonged diapause is consided to increase the speed of species invasion, at least in stochastic environments (Mahdjoub & Menu, ). Plasticity in diapause entry and emergence timing are therefore likely to be major contributors to the success of the swede midge in colonizing North America.…”

Section: Discussionmentioning

confidence: 99%

Patterns of diapause frequency and emergence in swede midges of southern Ontario

Marteaux

Schmidt

Habash

et al. 2014

Agri and Forest Entomology

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1 The swede midge is an invasive pest of crucifers in North America and exhibits temporal plasticity in diapause; diapause frequencies change throughout the growing season and spring emergence is typically bimodal. Factors controlling the timing of swede midge diapause events are not well understood. 2 Pre-diapause larval swede midge populations were isolated within cages in the field and tracked for emergence over 3 years. 3 Diapause frequency was inversely correlated with photoperiod and absolute maximum air temperature, however photoperiod did not influence emergence timing. Emergence from diapause occurred in two large peaks, in mid-June and early July, with a third, smaller peak in late August. Emergence phenotypes may correspond to different diapause durations from 236 to 296 days, or post-diapause development requiring between 516 and 1449 degree days. Approximately 2% of swede midges overwintered for 2 years. 4 Early control efforts would be most effective if they targeted the diapausing cohort (i.e. adults emerging June to July) to prevent damage by subsequent generations. Although few individuals overwintered for 2 years, prolonged diapause should be considered when crop rotation is employed for swede midge management.

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Prolonged diapause: A trait increasing invasion speed?

Cited by 22 publications

References 47 publications

Temporal Population Genetics of Time Travelling Insects: A Long Term Study in a Seed-Specialized Wasp

Temporal Population Genetics of Time Travelling Insects: A Long Term Study in a Seed-Specialized Wasp

Influence of foraging behavior and host spatial distribution on the localized spread of the emerald ash borer, Agrilus planipennis

Patterns of diapause frequency and emergence in swede midges of southern Ontario

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