Presentation is loading. Please wait.

Presentation is loading. Please wait.

Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University.

Similar presentations


Presentation on theme: "Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University."— Presentation transcript:

1 Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University

2 Vannote et al. 1980

3 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

4 Frady 2005

5 Banks 2005

6 Gregory et al. 1991

7

8

9 OG VanSickle & Gregory 1990 CC VanSickle & Gregory 1990 OG Murphy and Koski 1989 OG McDade et al.1990

10

11

12 Hypothesis Aquatic SlowSlow PhysicalPhysical SurfaceSurfaceTerrestrial FastFast BiologicalBiological DeepDeep

13 Aquatic Placement

14 Terrestrial Placement

15 Alnus rubra Decay Progression Aquatic Terrestrial Year 2Year 6Year 14

16 Pseudotsuga menziesii Decay Progression Aquatic Terrestrial Year 2Year 6Year 14

17

18

19

20 Resident trout populations (Mack Creek) CV = 26% Anadromous salmon populations (Coast Range) CV = 60%

21 Flynn Creek Before logging CV = 39% After logging CV = 42% Needle Branch Before logging CV = 39% After logging CV = 130%

22

23

24

25

26

27 Flynn Creek

28 Deer Creek

29 Needle Branch

30

31

32

33 StreamFlynnDeerNeedle CV (standard deviation/mean)

34 StreamFlynnDeerNeedle CV (standard deviation/mean)

35

36 Arkle and Pilliod 2010

37

38

39 Increased aquatic primary production Increased nutrient uptake by algae Increased quality of allochthonous inputs Increased temperature can increase growth and rates of biological processes

40 Increased temperature can decrease growth, increase disease, increase competition, and cause mortality Decreased uptake of nutrients by riparian plants

41 Decreased inputs of large wood Decreased habitat complexity Decreased refuge during floods Decreased channel stability Decreased food and nutrient retention

42

43 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


Download ppt "Dr. Stan Gregory Department of Fisheries & Wildlife Oregon State University."

Similar presentations


Ads by Google