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Published byNicholas Stewart Modified over 11 years ago
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Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University
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Vannote et al. 1980
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15 N tracer recovered (%) Forest Streams Agricultural Streams Urban Streams Organic matter9 – 588 – 6438 – >99 Gaseous N 2 and N 2 O loss<11 – 15<1 – 10 Downstream loss as NO 3 55 – 7944 – 89<1 – 53
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Frady 2005
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Banks 2005
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Gregory et al. 1991
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OG VanSickle & Gregory 1990 CC VanSickle & Gregory 1990 OG Murphy and Koski 1989 OG McDade et al.1990
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Hypothesis Aquatic SlowSlow PhysicalPhysical SurfaceSurfaceTerrestrial FastFast BiologicalBiological DeepDeep
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Aquatic Placement
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Terrestrial Placement
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Alnus rubra Decay Progression Aquatic Terrestrial Year 2Year 6Year 14
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Pseudotsuga menziesii Decay Progression Aquatic Terrestrial Year 2Year 6Year 14
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Resident trout populations (Mack Creek) CV = 26% Anadromous salmon populations (Coast Range) CV = 60%
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Flynn Creek Before logging CV = 39% After logging CV = 42% Needle Branch Before logging CV = 39% After logging CV = 130%
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Flynn Creek
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Deer Creek
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Needle Branch
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StreamFlynnDeerNeedle 1959-652.243.012.34 1966-741.583.733.13 1988-961.752.203.24 CV (standard deviation/mean) 1959-6523.717.233.5 1966-7455.039.767.6 1988-9628.639.155.7
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StreamFlynnDeerNeedle 1959-653.652.743.34 1966-743.422.801.71 1988-962.162.101.79 CV (standard deviation/mean) 1959-6547.940.316.6 1966-7414.522.745.3 1988-9635.324.866.5
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Arkle and Pilliod 2010
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Increased aquatic primary production Increased nutrient uptake by algae Increased quality of allochthonous inputs Increased temperature can increase growth and rates of biological processes
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Increased temperature can decrease growth, increase disease, increase competition, and cause mortality Decreased uptake of nutrients by riparian plants
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Decreased inputs of large wood Decreased habitat complexity Decreased refuge during floods Decreased channel stability Decreased food and nutrient retention
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Proportion of landscape and river network in early seral forests Proportion of riparian areas in early seral stages Network patterns of environmental factors, nutrients, and physical structure Network pattern of aquatic ecosystems
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