Graduate Thesis Or Dissertation

 

Drivers of Soil Fungal Communities Across Three Tropical Rainforests in Panama Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xp68kn20c

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  • Fungi play critical roles in ecosystem processes and interact with plant communities in mutualistic, pathogenic, and commensal ways. Fungal communities are thought to be influenced by both associated tree communities and soil properties. However, the relative importance of the biotic and abiotic drivers of soil fungal community structure and diversity in lowland tropical forests remains poorly understood. Community structure of trees and fungi was examined along a strong nutrient gradient in moist tropical forests in Panama. Soil properties and fine root biomass were characterized, and the ITS1 barcode region was sequenced to describe fungal community composition from 70 soil cores across three 1-ha tropical rainforest sites. Each fungal OTU was classified into different functional guilds: Plant pathogens, saprophytes, arbuscular mycorrhizal (AM), or ectomycorrhizal (ECM). Soil pH and moisture were common drivers of fungal communities of all guilds among forest sites. However, there were differences in strength of responses of fungal guilds to tree neighborhoods and soils in mostly expected ways based on their ecological function. Plant pathogens and saprophytes were more strongly correlated with soil properties than with tree neighborhood composition; ECM fungi showed a stronger correlation with tree neighborhood composition than with soil properties; and AM fungi were correlated with soil properties, but not with trees around cores. Overall, co-occurring fungal guilds respond differently to similar environmental factors, depending on their ecological function. Finally, obligate symbiotic guilds also responded to soil properties, highlighting the joint role that abiotic and biotic factors play in determining composition of fungal communities.
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  • description.provenance : Submitted by Tyler Schappe (schappet@oregonstate.edu) on 2017-09-22T21:46:07ZNo. of bitstreams: 1SchappeTylerL2017.pdf: 2441981 bytes, checksum: 451585221a9133cfe38f833a2166c57f (MD5)
  • description.provenance : Made available in DSpace on 2017-12-05T19:38:44Z (GMT). No. of bitstreams: 1SchappeTylerL2017.pdf: 2441981 bytes, checksum: 451585221a9133cfe38f833a2166c57f (MD5) Previous issue date: 2017-08-29
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Hi Tyler,Rejecting because the thesis starts on page 15 and it should be page 1. Also on pages 65-87 there are line numbers, which should be removed.Everything else looks good. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised PDF and resubmit.Thanks,Julie on 2017-09-22T18:46:13Z (GMT)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2017-09-22T21:49:12Z (GMT) No. of bitstreams: 1SchappeTylerL2017.pdf: 2441981 bytes, checksum: 451585221a9133cfe38f833a2166c57f (MD5)
  • description.provenance : Approved for entry into archive by Steven Van Tuyl(steve.vantuyl@oregonstate.edu) on 2017-12-05T19:38:44Z (GMT) No. of bitstreams: 1SchappeTylerL2017.pdf: 2441981 bytes, checksum: 451585221a9133cfe38f833a2166c57f (MD5)
  • description.provenance : Submitted by Tyler Schappe (schappet@oregonstate.edu) on 2017-09-13T23:03:58ZNo. of bitstreams: 1SchappeTylerL2017.pdf: 2454299 bytes, checksum: 015ba0e86fb6cfd108ac2ec2b9246459 (MD5)
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  • 2018-01-23 to 2018-05-29

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