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Phylogeography of an introduced inse...

University of Maryland, College Park., Entomology.

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Phylogeography of an introduced insect pest and consequences of an insect introduction.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Phylogeography of an introduced insect pest and consequences of an insect introduction./
Author:	Ahern, Robert G.
Description:	117 p.
Notes:	Adviser: Michael Raupp.
Contained By:	Dissertation Abstracts International68-04B.
Subject:	Biology, Entomology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3260295

Phylogeography of an introduced insect pest and consequences of an insect introduction.
Ahern, Robert G.

Phylogeography of an introduced insect pest and consequences of an insect introduction. - 117 p.

Adviser: Michael Raupp.

Thesis (Ph.D.)--University of Maryland, College Park, 2007.

Adelges cooleyi (Hemiptera: Adelgidae), a host-alternating gall-making insect pest native to the Rocky Mountains and Pacific Northwest and introduced into the eastern United States during the mid-19th century, was studied to address questions about phylogeography, to determine effects of introduction on genotypic and phenotypic variation, and to compare genetic variation associated with host use in native and introduced ranges. In Chapter One, sequence data from two mitochondrial (mtDNA) genes and amplified fragment length polymorphisms (AFLPs) were used to quantify the structure of genetic variation in the insect's native range. Several well-supported, divergent mtDNA lineages were identified. The structure of genetic variation among sampled locations is consistent with patterns shaped by glaciations. Samples from the southern edge of the insect's distribution are genetically isolated from the rest of the species, and hybridization of divergent mtDNA lineages via secondary contact was inferred from AFLP data.Subjects--Topical Terms:

1018619
Biology, Entomology.

Phylogeography of an introduced insect pest and consequences of an insect introduction.
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035 $a (UMI)AAI3260295
035 $a AAI3260295
040 $a UMI $c UMI
100 1 $a Ahern, Robert G. $3 1018795
245 1 0 $a Phylogeography of an introduced insect pest and consequences of an insect introduction.
300 $a 117 p.
500 $a Adviser: Michael Raupp.
500 $a Source: Dissertation Abstracts International, Volume: 68-04, Section: B, page: 2041.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2007.
520 $a Adelges cooleyi (Hemiptera: Adelgidae), a host-alternating gall-making insect pest native to the Rocky Mountains and Pacific Northwest and introduced into the eastern United States during the mid-19th century, was studied to address questions about phylogeography, to determine effects of introduction on genotypic and phenotypic variation, and to compare genetic variation associated with host use in native and introduced ranges. In Chapter One, sequence data from two mitochondrial (mtDNA) genes and amplified fragment length polymorphisms (AFLPs) were used to quantify the structure of genetic variation in the insect's native range. Several well-supported, divergent mtDNA lineages were identified. The structure of genetic variation among sampled locations is consistent with patterns shaped by glaciations. Samples from the southern edge of the insect's distribution are genetically isolated from the rest of the species, and hybridization of divergent mtDNA lineages via secondary contact was inferred from AFLP data.
520 $a Changes in genetic and phenotypic variation associated with introduction were quantified in Chapter Two. Introduced populations had decreased genetic variation relative to native populations. Variation in an ecologically important trait, host preference, was also significantly lower in introduced populations than in native populations. An association between mtDNA haplotypes and host preference was identified. Adelges cooleyi in the eastern US have low genetic and phenotypic variation but appear to be sufficiently adapted for persistence. My results call into question the utility of neutral genetic variation to assess the probability of persistence in new environments by introduced species.
520 $a Host-plants that A. cooleyi requires to complete its lifecycle are not native to the eastern US and occur together in patches that are often widely separated. In Chapter Three, analyses of mtDNA and AFLP genetic variation were conducted to determine the distribution of genetic variation within and among host plants in the native range and identify discrepancies that may be consistent with an incomplete lifecycle in the introduced range. Distribution of genetic variation within and among host-plants in the introduced range was not significantly different than that in the native range, as indicated by fixation indices, and I found no evidence for asexual populations in the introduced range.
590 $a School code: 0117.
650 4 $a Biology, Entomology. $3 1018619
650 4 $a Biology, Genetics. $3 1017730
690 $a 0353
690 $a 0369
710 2 $a University of Maryland, College Park. $b Entomology. $3 1018794
773 0 $t Dissertation Abstracts International $g 68-04B.
790 $a 0117
790 1 0 $a Raupp, Michael, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3260295