學術資源整合系統-相關推薦

 
作者Huang, Yu-Ling;Devan, Nandi MM;U'Ren, Jana M.;Furr, Susan H.;Arnold, A. Elizabeth
出版日期20150731
著作名稱Pervasive effects of wildfire on foliar endophyte communities in montane forest trees.
會議名稱Botany 2015
會議地點Edmonton, Alberta, Canada.
主辦單位Botanical Society of America & Mycological Society of America
國際性會議Y
主題真菌
關鍵字Ascomycota; diversity; Dothideomycetes; Eurotiomycetes; fire history; forest management; fungal endophytes; Leotiomycetes; Pezizomycetes; phenology; Sordariomycetes; symbiosis
摘要Trees in fire-adapted ecosystems form intimate symbioses with endophytic fungi that inhabit their healthy leaves. How these symbionts respond to major wildfires has not been studied previously. The goal of this study was to examine effects of severe, crown-killing wildfires on endophyte communities in ecologically important genera of forest trees, with a focus on traditionally fire-dominated montane ecosystems in the southwestern USA. Specifically, we used culture-based method to evaluate the abundance, diversity, and composition of endophytes in healthy foliage of Juniperus deppeana (Cupressaceae) and Quercus spp (Fagaceae) collected contemporaneously from areas affected by recent, severe wildfire (i.e., within and bordering areas burned in major fire events within the past 1-18 y) and paired areas not affected by recent fire (i.e., in proximate areas in which severe fires have not occurred within >50-100 y) across four mountain ranges in central and southern Arizona. We tested the broad hypotheses that (1) recent, severe fires would markedly alter the abundance, diversity, and composition of endophyte communities relative to those in proximate, unburned trees; and (2) such differences would decrease as time since fire increases. Samples were grouped into three fire age classes (≤ 6 y, 7-18 y, and > 50 y since the major wildfire) according to the fire history. Analyses of >1100 endophyte isolates revealed pervasive effects of severe fires on endophyte communities: isolation frequency, diversity, community structure and taxonomic composition differed as a function of fire age class. Observed differences did not correspond to intrinsic differences among geographic locations, herbivory or pathogen damage, or leaf chemistry. Although communities differed significantly between host taxa, responses to fire were similar in endophytes of each host in these traditionally fire-dominated ecosystems. Several potentially fire-tolerant taxa (eg. Pezizomycetes) were prevalent in fire-affected trees but rare or absent in trees not affected by recent fire, whereas other major groups (e.g., Leotiomycetes) were absent in most recent fire-affected trees. Fungal endophytes present in trees after severe fire represented subsets of the available mycoflora that appear to circulate at a regional scale among these historically fire-affected forests. Together these findings contribute to an emerging perspective on the responses of diverse communities to severe fire, and highlight the importance of considering fire history when estimating endophyte diversity and community structure for particular biomes.
資料連結Full Text
系統號NO000004447

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