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Ecological factors influencing the beneficial endosymbionts of the hemlock woolly adelgid (Hemiptera:Adelgidae)

Insect Science 2019年第1期26卷 97-107页

作者： Angela M.Mech Sherilyn J.Harper Nathan P.Havill Carol D.von Dohlen Gaelen R.Burke Department of Entomology University of GeorgiaAthensGeorgiaUSA School of Environmental and Forest Sciences University of WashingtonSeattleWashingtonUSA USDA Forest Service Northern Research StationHamdenConnecticutUSA Department of Biology Utah State UniversityLoganUtahUSA

Bacterial endosymbionts of sap-sucking insects provide their host with a num- ber of beneficial qualities,including the supply of nutrition,defense against parasitoids, and protection from heat *** to these bacterial associates can therefore have a negative impact on the fitness of their insect *** evaluated observational and experi- mental factors regarding the normative hemlock woolly adelgid (Adelges tsugae Annand) (Hemiptera:Adelgidae)to help understand the roles of its three recently identified symbionts,including under heat stress *** prevalence of ***'s facultafive symbiont (Serratia symbiotica)was examined at different spatial scales to determine how variable infection rates are for this *** was no significant difference found in infection rates between adelgids on a tree,within a plot,or within a ***, significantly more adelgids in Georgia (95%)had *** compared to those in New York (68%).Microsatellite genotyping of the adelgids found that this difference was most likely not the result of a second introduction *** into eastern North *** *** proportions between first and fourth instars showed that symbiont absence did not affect the ability *** to survive *** of sym- biont densities within each adelgid found that when *** was absent,the density of obligate symbionts was significantly *** to heat stress (32.5℃)was not consistently correlated with changes in symbiont densities over a 4-d ***,we have shown that symbiont prevalence and densities vary within the broad population of *** in eastern North America,with potentially significant effects upon the ecology of this important pest.

关键词： Adelges tsugae Anncindia adelgestsuga bacterial endosymbionts Serratia symbiotica Pseudomonas adelgestsugas

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