Foliar Fungal Endophytes Associated with Native Hawaiian Plants and the Biogeography of their Interactions Across the Archipelago.

dc.contributor.author Cobian, Gerald M.
dc.contributor.department Botany
dc.date.accessioned 2019-05-28T19:38:20Z
dc.date.available 2019-05-28T19:38:20Z
dc.date.issued 2018-05
dc.identifier.uri http://hdl.handle.net/10125/62220
dc.subject Fungi
dc.subject Foliar Endophytic Fungi
dc.subject Community Ecology
dc.subject Elevation Gradient
dc.title Foliar Fungal Endophytes Associated with Native Hawaiian Plants and the Biogeography of their Interactions Across the Archipelago.
dc.type Thesis
dcterms.abstract Foliar fungal endophytes are a globally ubiquitous group of fungi that form species rich communities within plant host leaves. While uncertainty exists about the exact mechanisms determining fungal endophyte community assembly, communities have been shown to be structured by their host species as well as local environmental conditions. However, our understanding of the interaction between host specialization and local environmental conditions is limited, especially at broader spatial scales within the same host species. The aim of this dissertation was to address this knowledge gap, through the examination of fungal endophyte communities at the regional and landscape scale within the Hawaiian archipelago. Specific objectives were to determine whether (1) host selection or island is a stronger determinate of community structure at the regional scale, (2) habitat filtering or host selection is a stronger determinate of community structure at the landscape scale by communities within the same hosts across an elevation gradient on the island of Hawai`i, and (3) whether fungal endophytes follow similar distribution patterns as their plant hosts at the landscape scale. Examination of fungal endophyte communities across the Hawaiian Archipelago revealed that communities are structured by both island and host, but more strongly by island. At the landscape scale, fungal endophyte communities were significantly structured by host species, with little to no environmental effect. Similar to other microbial studies, fungal endophyte species did not display similar patterns as larger organismal groups, and were largely random in their distribution, indicating that fungal endophytes and their hosts’ distributions are regulated by different factors. Collectively, these studies indicate that fungal endophyte community structure is scale dependent. At regional spatial scales, in this case the Hawaiian archipelago, geographic location is a stronger determinate of community structure than host species, signifying the importance of local ecological conditions, such as local environmental conditions, dispersal limitations, and evolutionary history. Conversely, at landscape scales, such as the elevation gradient examined, host was observed to be a stronger determinant of community structure than geographic location.
dcterms.description Ph.D. Thesis. University of Hawaiʻi at Mānoa 2018.
dcterms.language eng
dcterms.publisher University of Hawaiʻi at Mānoa
dcterms.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dcterms.type Text
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