globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2014.02.031
Scopus记录号: 2-s2.0-84899908106
论文题名:
Source or sink? The role of soil and water borne inoculum in the dispersal of Phytophthora ramorum in Oregon tanoak forests
作者: Peterson E.; Hansen E.; Hulbert J.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2014
卷: 322
起始页码: 48
结束页码: 57
语种: 英语
英文关键词: Aerial dispersal ; Disease gradients ; Forest pathology ; Invasive pathogen ; Phytophthora ramorum ; Sudden oak death
Scopus关键词: Forestry ; Information management ; Pathogens ; Population distribution ; Risk assessment ; Rivers ; Soils ; Vegetation ; Aerial observations ; Alternative hypothesis ; Biological information ; Eradication programs ; Invasive pathogens ; Phytophthora ramorum ; Sudden oak death ; Understory vegetation ; Fog dispersal ; Diseases ; Forestry ; Pathogens ; Plants ; Risk Assessment ; Rivers ; Soil ; Lithocarpus ; Phytophthora ; Phytophthora ramorum ; Quercus
英文摘要: Management of invasive species requires confidence in the detection methods used to assess expanding distributions, as well as an understanding of the dominant modes of spread. Lacking this basic biological information, during early stages of invasion management choices are often driven by available resources and the biology of closely related species. Such has been the case for the management of the phytopathogen, Phytophthora ramorum, causal agent of sudden oak death (SOD) of oaks and tanoaks. To detect P. ramorum, The Oregon SOD eradication program has relied upon the aerial observation of dead, overstory tanoak (Notholithocarpus densiflorus), an easily infected host widely distributed throughout the range of P. ramorum in Oregon. At risk is the possibility of misrepresenting the distribution of SOD, particularly if inoculum is predominately moved in soil and water, common dispersal pathways for other Phytophthora spp. To assess this risk, we performed surveys of understory vegetation in areas with a high risk of establishment of understory infection from soil and water sources: along roadsides within heavily trafficked areas with a history of SOD, and along streams known to contain P. ramorum inoculum. Additionally, we tested the alternative hypothesis of aerial dispersal, whereby infection in the understory would be spatially correlated with overstory mortality. Consistent with prior studies into the spatial structure of P. ramorum in Oregon, we found no evidence of understory infection in close proximity to roads in the absence of overstory mortality. Similarly, P. ramorum was only isolated from understory vegetation associated with streams when within close proximity to overstory sources, and more commonly further away from stream edges than within the splash and flood line. Both disease patterns are inconsistent with a dominate soil and water mediated dispersal mechanism. Rather, we found evidence supporting our alternative hypothesis of aerial dispersal whereby recovery of P. ramorum in the understory declined with increasing distance from the only known overstory source. These results support the use of aerial detection in describing the distribution of SOD in Oregon, and give further support to dispersal of inoculum in blowing fog or rain at scales not yet described for other forest Phytophthora species. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65976
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Botany and Plant Pathology, Oregon State University, 2082 Cordley Hall, Corvallis, OR 97331, United States

Recommended Citation:
Peterson E.,Hansen E.,Hulbert J.. Source or sink? The role of soil and water borne inoculum in the dispersal of Phytophthora ramorum in Oregon tanoak forests[J]. Forest Ecology and Management,2014-01-01,322
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