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Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers)./
作者:	Dowie, Nicholas J.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	208 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Contained By:	Dissertations Abstracts International81-03B.
標題:	Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13864510
ISBN:	9781085624404

Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers).
Dowie, Nicholas J.

Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers). - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 208 p.

Source: Dissertations Abstracts International, Volume: 81-03, Section: B.

Thesis (Ph.D.)--University of Wyoming, 2019.

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

Evolutionary outcomes resulting from specificity in complex symbiotic associations play a pivotal role in driving species interactions, population and community structure, and evolutionary ecology. Studies investigating the role of symbiont specificity as an important ecological factor for influencing historical and contemporary species distributions or wide range patterns of genetic structure within populations and across communities is needed.Tripartite symbioses in fully mycoheterotrophic systems provide an excellent model in which to study the effects of specificity in complex symbioses as mycoheterotrophs are nonphotosynthetic plants whose survival is dependent on obligate symbioses with fungi, which in turn, are obligate with photoautotrophs. This research focuses specifically on the mycoheterotroph Pterospora andromedea and its suite of associated fungi in the model ectomycorrhizal genus Rhizopogon, Basidiomycetes. The objectives for this research were to i) provide a comprehensive examination of host-symbiont specificity across the entire endemic range of the tripartite association, ii) examine the cophylogeography of the plant and fungus associates across the biogeographic mosaic of North America, and iii) evaluate the role that specificity plays in the evolutionary ecology of these symbioses.To accomplish these objectives, a directed and incremental research approach was performed in this system spanning five manuscripts/chapters. 1) Examination of fungal species associated with P. andromedea in the biological hotspot of the Greater Yellowstone Ecosystem, which documented the first evidence for cryptic evolutionary ecology and complexity in these mycoheterotrophic systems. From here, 2) extensive collections across North America were required to more comprehensively survey host-symbiont specificity by using single locus molecular methodologies that have been traditionally used. The results from this broad-scale study documented exceptions for extreme host-symbiont specificity in this system and provided evidence for a geographic mosaic of host-symbiont selectivity and specificity across North America. 3) To more robustly resolve these patterns, additional molecular markers, Anonymous Nuclear Loci (ANL), were developed for Rhizopogon subgenus Amylopogon species. These markers were tested using all known species within R. subgenus Amylopogon, including type specimens, and were found to increase phylogenetic resolution which supported many traditionally described taxa, eliminated synonymously named taxa and elucidated the high potential for cryptic new species within this subgenus. 4) ANL were also developed to delineate P. andromedea lineages. Despite the numerous markers tested, little genetic structure could be found in P. andromedea which provided novel revelations to its evolutionary history. 5) In building from all prerequisite research, a cumulative and comprehensive evaluation for host-symbiont specificity within the tripartite system over the entire endemic range of the biogeographic mosaic was performed. Evidence for cryptic host-symbiont specificity within the tripartite symbiosis was found across North America for eleven delimited R. subgenus Amylopogon species, four lineages of P. andromedea and five Pinus species. Recent species divergence, in thousands of years, was also observed for ectomycorrhizal fungi and was corroborated by Pinus spp. biogeography.Compelling evidence for cryptic specificity and rapid divergence represents a critical component in linking ecological and evolutionary processes in complex symbioses and warrants consideration for an ecological specificity species concept criterion for evaluating speciation, species groups, biodiversity and conservation in complex symbiotic associations.

ISBN: 9781085624404Subjects--Topical Terms:

516217
Botany.

Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers).
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245 1 0 $a Cryptic Ecological Specificity Linked to Species Divergence in a Cophylogeographic Evaluation of a Tripartite Symbiosis (an Acholorophyllous Plant, Ectomycorrhizal Fungi, and Conifers).
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520 $a Evolutionary outcomes resulting from specificity in complex symbiotic associations play a pivotal role in driving species interactions, population and community structure, and evolutionary ecology. Studies investigating the role of symbiont specificity as an important ecological factor for influencing historical and contemporary species distributions or wide range patterns of genetic structure within populations and across communities is needed.Tripartite symbioses in fully mycoheterotrophic systems provide an excellent model in which to study the effects of specificity in complex symbioses as mycoheterotrophs are nonphotosynthetic plants whose survival is dependent on obligate symbioses with fungi, which in turn, are obligate with photoautotrophs. This research focuses specifically on the mycoheterotroph Pterospora andromedea and its suite of associated fungi in the model ectomycorrhizal genus Rhizopogon, Basidiomycetes. The objectives for this research were to i) provide a comprehensive examination of host-symbiont specificity across the entire endemic range of the tripartite association, ii) examine the cophylogeography of the plant and fungus associates across the biogeographic mosaic of North America, and iii) evaluate the role that specificity plays in the evolutionary ecology of these symbioses.To accomplish these objectives, a directed and incremental research approach was performed in this system spanning five manuscripts/chapters. 1) Examination of fungal species associated with P. andromedea in the biological hotspot of the Greater Yellowstone Ecosystem, which documented the first evidence for cryptic evolutionary ecology and complexity in these mycoheterotrophic systems. From here, 2) extensive collections across North America were required to more comprehensively survey host-symbiont specificity by using single locus molecular methodologies that have been traditionally used. The results from this broad-scale study documented exceptions for extreme host-symbiont specificity in this system and provided evidence for a geographic mosaic of host-symbiont selectivity and specificity across North America. 3) To more robustly resolve these patterns, additional molecular markers, Anonymous Nuclear Loci (ANL), were developed for Rhizopogon subgenus Amylopogon species. These markers were tested using all known species within R. subgenus Amylopogon, including type specimens, and were found to increase phylogenetic resolution which supported many traditionally described taxa, eliminated synonymously named taxa and elucidated the high potential for cryptic new species within this subgenus. 4) ANL were also developed to delineate P. andromedea lineages. Despite the numerous markers tested, little genetic structure could be found in P. andromedea which provided novel revelations to its evolutionary history. 5) In building from all prerequisite research, a cumulative and comprehensive evaluation for host-symbiont specificity within the tripartite system over the entire endemic range of the biogeographic mosaic was performed. Evidence for cryptic host-symbiont specificity within the tripartite symbiosis was found across North America for eleven delimited R. subgenus Amylopogon species, four lineages of P. andromedea and five Pinus species. Recent species divergence, in thousands of years, was also observed for ectomycorrhizal fungi and was corroborated by Pinus spp. biogeography.Compelling evidence for cryptic specificity and rapid divergence represents a critical component in linking ecological and evolutionary processes in complex symbioses and warrants consideration for an ecological specificity species concept criterion for evaluating speciation, species groups, biodiversity and conservation in complex symbiotic associations.
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