Prolonged diapause occurs in a number of insects and is interpreted as a way to evade adverse conditions. The winter pine processionary moths (Thaumetopoeapityocampa andTh.wilkinsoni)areimportantpestsofpinesandcedarsintheMediterraneanregion. They are typically univoltine, with larvae feeding across the winter, pupating in spring in the soil and emerging as adults in summer. Pupae may, however, enter a prolonged diapausewithadultsemergingoneormoreyearslater.Wetestedtheeffectofvariation in winter temperature on the incidence of prolonged diapause, using a total of 64 individual datasets related to insect cohorts over the period 1964–2015 for 36 sites in sevencountries,coveringmostofthegeographicrangeofbothspecies.Wefoundhigh variation in prolonged diapause incidence over their ranges. At both lower and upper ends of the thermal range in winter, prolonged diapause tended to be higher than at intermediatetemperatures.Prolongeddiapausemayrepresentarisk-spreadingstrategy tomitigateclimateuncertainty,althoughitmayincreaseindividualmortalitybecauseof alongerexposuretomortalityfactorssuchaspredation,parasitism,diseasesorenergy depletion. Climate change, and in particular the increase of winter temperature, may reduce the incidence of prolonged diapause in colder regions whereas it may increase it in warmer ones, with consequences for population dynamics.
|Titolo:||Winter temperature predicts prolonged diapause in pine processionary moth species across their geographic range|
|Data di pubblicazione:||2019|
|Appare nelle tipologie:||1.1 Articolo in rivista|