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Examining Host Specificity of Chryso...

Dejonge, Rhoda Bernadette.

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Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae)./
Author:	Dejonge, Rhoda Bernadette.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	160 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Contained By:	Dissertations Abstracts International80-02B.
Subject:	Urban Forestry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10684776
ISBN:	9780438186378

Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae).
Dejonge, Rhoda Bernadette.

Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae). - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 160 p.

Source: Dissertations Abstracts International, Volume: 80-02, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2018.

This item must not be sold to any third party vendors.

Native insects have the capacity to form novel associations with invasive plants, which in some cases may allow them to exploit the invaders as hosts. To date, little work has been done to predict these novel associations and their outcomes before they occur. By conducting host-specificity tests on native North American Chrysochus spp. (C. auratus, C. cobaltinus, and their hybrid) with the European invasive vine, Vincetoxicum rossicum and North American Apocynaceae plants, this thesis: (1) addresses the question as to whether native Chrysochus spp. will form a novel association with the vine; (2) predicts the outcomes of such an association; (3) suggests ways to improve the potential biotic resistance of these beetles to reduce the spread of this vine; (4) compares host specificity results of these North American beetles with their European congener C. asclepiadeus, in order to enhance predictions of its ecological host range. Feeding, survival, oviposition, and development tests with North American Chrysochus at all life stages demonstrate: (1) V. rossicum may act as an ovipositional sink for eastern C. auratus; (2) the vine could be a source of food for C. cobaltinus when the plant expands its range westward; and (3) Chrysochus hybridization will not increase use of this invasive vine. In addition, host-specificity tests conducted here show that C. auratus , which does not feed or develop on Asclepias spp. in its natural ecological host range, will complete development on plants in this genus when exposed under lab conditions. This false positive for host plant specificity suggests that, in this genus, the predicted ecological host range of the European congener (C. asclepiadeus) of the two North American species may have been overestimated. Overall, my findings highlight: (1) the importance of predicting novel associations before they occur in the field; (2) demonstrate how the testing of native relatives of biological control candidates can enhance ecological host-range predictions for classical agents; and (3) increase our knowledge about the potential outcomes of novel associations between introduced V. rossicum and North American Chrysochus spp.

ISBN: 9780438186378Subjects--Topical Terms:

3438187
Urban Forestry.
Subjects--Index Terms:

Biological control

Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae).
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245 1 0 $a Examining Host Specificity of Chrysochus Spp. (Coleoptera: Chrysomelidae) to Inform Management of Invasive Dog Strangling Vine Vincetoxicum rossicum (Apocynaceae).
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 160 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Smith, Sandy M.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2018.
506 $a This item must not be sold to any third party vendors.
520 $a Native insects have the capacity to form novel associations with invasive plants, which in some cases may allow them to exploit the invaders as hosts. To date, little work has been done to predict these novel associations and their outcomes before they occur. By conducting host-specificity tests on native North American Chrysochus spp. (C. auratus, C. cobaltinus, and their hybrid) with the European invasive vine, Vincetoxicum rossicum and North American Apocynaceae plants, this thesis: (1) addresses the question as to whether native Chrysochus spp. will form a novel association with the vine; (2) predicts the outcomes of such an association; (3) suggests ways to improve the potential biotic resistance of these beetles to reduce the spread of this vine; (4) compares host specificity results of these North American beetles with their European congener C. asclepiadeus, in order to enhance predictions of its ecological host range. Feeding, survival, oviposition, and development tests with North American Chrysochus at all life stages demonstrate: (1) V. rossicum may act as an ovipositional sink for eastern C. auratus; (2) the vine could be a source of food for C. cobaltinus when the plant expands its range westward; and (3) Chrysochus hybridization will not increase use of this invasive vine. In addition, host-specificity tests conducted here show that C. auratus , which does not feed or develop on Asclepias spp. in its natural ecological host range, will complete development on plants in this genus when exposed under lab conditions. This false positive for host plant specificity suggests that, in this genus, the predicted ecological host range of the European congener (C. asclepiadeus) of the two North American species may have been overestimated. Overall, my findings highlight: (1) the importance of predicting novel associations before they occur in the field; (2) demonstrate how the testing of native relatives of biological control candidates can enhance ecological host-range predictions for classical agents; and (3) increase our knowledge about the potential outcomes of novel associations between introduced V. rossicum and North American Chrysochus spp.
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653 $a Invasive species
653 $a Novel associations
653 $a Vincetoxicum rossicum
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