When one is not necessarily a lonely number: initial colonization dynamics of Adelges tsugae on eastern hemlock, Tsuga canadensis

Tobin, Patrick C.; Turcotte, Richard M.; Snider, Daniel A.

doi:10.1007/s10530-013-0421-3

Cited by 26 publications

(19 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tobin et al . () provide support for this by showing that inoculation of eastern hemlock trees with a single A. tsugae individual can result in successful establishment. Second, clones introduced from a sexual lineage might have higher fitness in a novel environment than those from an obligately asexual lineage due to accumulation of deleterious mutations in the latter.…”

Section: Discussionmentioning

confidence: 82%

Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

et al. 2016

View full text Add to dashboard Cite

Hemlock woolly adelgid, Adelges tsugae, is an invasive pest of hemlock trees (Tsuga) in eastern North America. We used 14 microsatellites and mitochondrial COI sequences to assess its worldwide genetic structure and reconstruct its colonization history. The resulting information about its life cycle, biogeography and host specialization could help predict invasion by insect herbivores. We identified eight endemic lineages of hemlock adelgids in central China, western China, Ulleung Island (South Korea), western North America, and two each in Taiwan and Japan, with the Japanese lineages specializing on different Tsuga species. Adelgid life cycles varied at local and continental scales with different sexual, obligately asexual and facultatively asexual lineages. Adelgids in western North America exhibited very high microsatellite heterozygosity, which suggests ancient asexuality. The earliest lineages diverged in Asia during Pleistocene glacial periods, as estimated using approximate Bayesian computation. Colonization of western North America was estimated to have occurred prior to the last glacial period by adelgids directly ancestral to those in southern Japan, perhaps carried by birds. The modern invasion from southern Japan to eastern North America caused an extreme genetic bottleneck with just two closely related clones detected throughout the introduced range. Both colonization events to North America involved host shifts to unrelated hemlock species. These results suggest that genetic diversity, host specialization and host phylogeny are not predictive of adelgid invasion. Monitoring non-native sentinel host trees and focusing on invasion pathways might be more effective methods of preventing invasion than making predictions using species traits or evolutionary history.

show abstract

Section: Discussionmentioning

confidence: 82%

Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In a similar hemlock woolly adelgid inoculation experiment in a hemlock plantation in West Virginia, Tobin et al (2013) found no evidence of densitydependent survival during the progrediens stage. The Table 3.…”

Section: Discussionmentioning

confidence: 83%

Density-Dependent Survival and Fecundity of Hemlock Woolly Adelgid (Hemiptera: Adelgidae)

Sussky

Elkinton

2014

Environ Entomol

View full text Add to dashboard Cite

The hemlock woolly adelgid (Adelges tsugae Annand) has decimated eastern hemlocks (Tsuga canadensis Carrière) in forests throughout the eastern United Sates, but its densities in central New England appear to have stabilized. To find out why, we infested 64 eastern hemlocks with varying densities of adelgid ovisacs in a typical eastern hemlock forest in western Massachusetts. We subsequently documented adelgid density, fecundity, and the amount of new growth on experimental trees over two consecutive years. We used a 2 by 2 randomized block design using previously and newly infested hemlocks that were either 1-m tall saplings or branches of mature trees. There was a density-dependent decline in the survival and fecundity of adelgid in both the spring and winter generations. This response was a function of both previous infestation by adelgid and current year's crawler density in the spring generation. Additionally, the production of sexuparae in the spring generation played a key role in the overall density-dependent survival of adelgid, suggesting that sexuparae production is strongly linked to developing crawler density.

show abstract

“…For example, DED is spread by bark beetles and an exotic ambrosia beetle is a vector for LW. The similarity in rates of spread may also be due to the lack of Allee effects in species such as HWA [58]. However, most of those species that rely on passive dispersal (BWA, HWA, DA, WPBR) have spread more slowly than those species that can fly long distances or are vectored by flying insects.…”

Section: Discussionmentioning

confidence: 99%

The Speed of Invasion: Rates of Spread for Thirteen Exotic Forest Insects and Diseases

Evans

2016

Forests

View full text Add to dashboard Cite

Invasive, exotic insects and diseases have a devastating effect on North American forests. The rate of spread, or range expansion, is one of the main determinants of an invasive organism's impact, and can play a major role in structuring management response options. To better understand how exotic organisms have spread through our forests, this study employs a consistent, rigorous analytical framework to analyze a comprehensive geospatial database for the spread of seven exotic insects and six diseases. This study includes new data for six insects and two diseases in combination with five invasive species previously analyzed using the same technique. The quantile regression analysis of over 3000 records of infestation over the preceding century show that the rate of spread of invasive forest insects and diseases ranges from 4.2 km¨year´1 to 57.0 km¨year´1. The slowest disease spread was white pine blister rust (Cronartium ribicola) at 7.4 km¨year´1 while the most rapid disease spread was chestnut blight (Cryphonectria parasitica) at 31.3 km¨year´1. The slowest insect spread was balsam woolly adelgid (Adelges piceae) (4.2 km¨year´1) while the fastest was emerald ash borer (Agrilus planipennis) at 57.0 km¨year´1. Species that can fly long distances or are vectored by flying insects have spread faster than those that are passively dispersed. This analysis highlights the difficulty of estimating spread rates from studies of individual dispersal or flight distances, but the estimated spread rates in this study are generally in line with previous estimates.

show abstract

When one is not necessarily a lonely number: initial colonization dynamics of Adelges tsugae on eastern hemlock, Tsuga canadensis

Cited by 26 publications

References 45 publications

Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

Density-Dependent Survival and Fecundity of Hemlock Woolly Adelgid (Hemiptera: Adelgidae)

The Speed of Invasion: Rates of Spread for Thirteen Exotic Forest Insects and Diseases

Contact Info

Product

Resources

About