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Published byNicholas Stewart
Modified over 4 years ago
Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University
Vannote et al. 1980
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
Gregory et al. 1991
OG VanSickle & Gregory 1990 CC VanSickle & Gregory 1990 OG Murphy and Koski 1989 OG McDade et al.1990
Hypothesis Aquatic SlowSlow PhysicalPhysical SurfaceSurfaceTerrestrial FastFast BiologicalBiological DeepDeep
Alnus rubra Decay Progression Aquatic Terrestrial Year 2Year 6Year 14
Pseudotsuga menziesii Decay Progression Aquatic Terrestrial Year 2Year 6Year 14
Resident trout populations (Mack Creek) CV = 26% Anadromous salmon populations (Coast Range) CV = 60%
Flynn Creek Before logging CV = 39% After logging CV = 42% Needle Branch Before logging CV = 39% After logging CV = 130%
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
StreamFlynnDeerNeedle 1959-653.652.743.34 1966-743.422.801.71 1988-922.214.171.124 CV (standard deviation/mean) 1959-6547.940.316.6 1966-7414.522.745.3 1988-9635.324.866.5
Arkle and Pilliod 2010
Increased aquatic primary production Increased nutrient uptake by algae Increased quality of allochthonous inputs Increased temperature can increase growth and rates of biological processes
Increased temperature can decrease growth, increase disease, increase competition, and cause mortality Decreased uptake of nutrients by riparian plants
Decreased inputs of large wood Decreased habitat complexity Decreased refuge during floods Decreased channel stability Decreased food and nutrient retention
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
An Introduction to OSU StreamWood Mark A. Meleason 2, Daniel J. Sobota 1, Stanley V. Gregory 3 1 Washington State University, Vancouver Campus 2 USDA Forest.
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