Adaptation Features of Diapause Duration of the Gypsy Moth Lymantria dispar (L.) from Populations of Different Latitudinal Origination

Пономарев, В. И.; Клобуков, Г. И.; Ilyinykh, A. V.; Dubovskiy, Ivan M.

doi:10.1134/s1995425519010098

Cited by 2 publications

(1 citation statement)

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“…Indeed, at the time traps were taken down from the trees, male flight had already reached its declining phase, suggesting that our trapping activity had covered most of the flight period. It is unlikely that the presence of female moths significantly affected captures of males by pheromone traps due to competition between females and pheromone lures when population levels are high; the latter is suggested by the fact that pheromone traps caught very high numbers of males in an independent study of spongy moth flight phenology [ 29 ]. In Canada, the traps were secured to host trees in a manner similar to that described above.…”

Section: Methodsmentioning

confidence: 99%

Phenological Features of the Spongy Moth, Lymantria dispar (L.) (Lepidoptera: Erebidae), in the Northernmost Portions of Its Eurasian Range

Ponomarev¹,

Клобуков²,

Napalkova³

et al. 2023

Insects

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The spongy moth, Lymatria dispar, is a classic example of an invasive pest accidentally introduced from Europe to North America, where it has become one of the most serious forest defoliators, as in its native range. The present study was aimed at (i) identifying the current northern limit of L. dispar’s Eurasian range and exploring its northward expansion in Canada using pheromone trap data, and (ii) comparing northern Eurasian populations with those from central and southern regions with respect to male flight phenology, the sums of effective temperatures (SETs) above the 7 °C threshold necessary for development to the adult stage, and heat availability. We show that the range of L. dispar in Eurasia now reaches the 61st parallel, and comparisons with historical data identify the average speed of spread as 50 km/year. We also document the northern progression of L. dispar in southern Canada, where the actual northern boundary of its range remains to be identified. We show that the median date of male flight does not vary greatly between northern and southern regions of the spongy moth range in Eurasia despite climate differences. Synchronization of flight at different latitudes of the range is associated with an acceleration of larval development in northern Eurasian populations. Similar changes in developmental rate along a latitudinal gradient have not been documented for North American populations. Thus, we argue that this feature of spongy moths from northern Eurasia poses a significant invasive threat to North America in terms of enhanced risks for rapid northward range expansion.

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Section: Methodsmentioning

confidence: 99%