DOI: 10.1016/j.foreco.2015.09.049
Scopus记录号: 2-s2.0-84943575789
论文题名: Wildfire may increase habitat quality for spring Chinook salmon in the Wenatchee River subbasin, WA, USA
作者: Flitcroft R.L. ; Falke J.A. ; Reeves G.H. ; Hessburg P.F. ; McNyset K.M. ; Benda L.E.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 359 起始页码: 126
结束页码: 140
语种: 英语
英文关键词: Bayesian model
; Life stages
; Population resilience
; Spring Chinook salmon
; Watershed-scale
; Wildfire
Scopus关键词: Bayesian networks
; Ecosystems
; Fire hazards
; Fires
; Fish
; Forestry
; Land use
; Rivers
; Sediments
; Stream flow
; Water
; Watersheds
; Bayesian model
; Chinook salmon
; Life stages
; Population resilience
; Watershed scale
; Wildfire
; Population distribution
; Oncorhynchus tshawytscha
; Salmonidae
英文摘要: Pacific Northwest salmonids are adapted to natural disturbance regimes that create dynamic habitat patterns over space and through time. However, human land use, particularly long-term fire suppression, has altered the intensity and frequency of wildfire in forested upland and riparian areas. To examine the potential impacts of wildfire on aquatic systems, we developed stream-reach-scale models of freshwater habitat for three life stages (adult, egg/fry, and juvenile) of spring Chinook salmon (Oncorhynchus tshawytscha) in the Wenatchee River subbasin, Washington. We used variables representing pre- and post-fire habitat conditions and employed novel techniques to capture changes in in-stream fine sediment, wood, and water temperature. Watershed-scale comparisons of high-quality habitat for each life stage of spring Chinook salmon habitat suggested that there are smaller quantities of high-quality juvenile overwinter habitat as compared to habitat for other life stages. We found that wildfire has the potential to increase quality of adult and overwintering juvenile habitat through increased delivery of wood, while decreasing the quality of egg and fry habitat due to the introduction of fine sediments. Model results showed the largest effect of fire on habitat quality associated with the juvenile life stage, resulting in increases in high-quality habitat in all watersheds. Due to the limited availability of pre-fire high-quality juvenile habitat, and increased habitat quality for this life stage post-fire, occurrence of characteristic wildfires would likely create a positive effect on spring Chinook salmon habitat in the Wenatchee River subbasin. We also compared pre- and post-fire model results of freshwater habitat for each life stage, and for the geometric mean of habitat quality across all life stages, using current compared to the historic distribution of spring Chinook salmon. We found that spring Chinook salmon are currently distributed in stream channels in which in-stream habitat for most life stages has a consistently positive response to fire. This compares to the historic distribution of spring Chinook, in which in-stream habitat exhibited a variable response to fire, including decreases in habitat quality overall or for specific life stages. This suggests that as the distribution of spring Chinook has decreased, they now occupy those areas with the most positive potential response to fire. Our work shows the potentially positive link between wildfire and aquatic habitat that supports forest managers in setting broader goals for fire management, perhaps leading to less fire suppression in some situations. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65196
Appears in Collections: 影响、适应和脆弱性
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作者单位: USDA Forest Service, Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR, United States; U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, University of Alaska Fairbanks, P.O. Box 757020, Fairbanks, AK, United States; USDA Forest Service, Pacific Northwest Research Station, 1133 N. Western Avenue, Wenatchee, WA, United States; NOAA Affiliate, Corvallis, OR, United States; Earth Systems Institute, 310 N Mt Shasta Blvd, Suite 6, Mt Shasta, CA, United States
Recommended Citation:
Flitcroft R.L.,Falke J.A.,Reeves G.H.,et al. Wildfire may increase habitat quality for spring Chinook salmon in the Wenatchee River subbasin, WA, USA[J]. Forest Ecology and Management,2016-01-01,359