Ecology of Place: What salmon need Eric Beamer Skagit River System Cooperative. November 2010

Transcription

1 Ecology of Place: What salmon need Eric Beamer Skagit River System Cooperative November 2010

2 Acknowledgements NOAA Fisheries NW Fisheries Science Center Tim Beechie George Pess Correigh Greene

3 Talk overview A simplification of what salmon need Focus mostly on physical habitats required by salmon Using a few coho salmon examples and even fewer steelhead examples but more Chinook salmon examples Coho Salmon From G. Pess Steelhead From B. McMillian Chinook Salmon From C. Geene

4 What do salmon need? Abundant, productive, and diverse populations (fish). Abundant, productive, and diverse habitat within our landscape.

5 What do salmon need? Healthy processes working within our landscape. Natural Processes Habitat Conditions Biotic Response Stressors

6 Our Landscape is large and diverse!

7 Habitat complexity & connectivity Increased fish species diversity

8 Examples of Freshwater Diversity

9

10 31% loss of floodplain isolated or shadowed from river hydrology 17% of large river edge is hardened (riprap) loss of off channel length, backwater area, and natural bank habitat

11 Skagit River Non-tidal Delta 98% loss of area where freshwater rearing habitat could form Agriculture land use shifting to urbanized

12 Example of Estuary Diversity

13 Skagit Estuary Habitat Change Skagit tidal delta habitats smaller and more fragmented. Rearing opportunity of tidal delta rearing Chinook reduced 88% Restoration opportunities exist at historic delta sites.

14 Creek Sediment Source Beach Drowned Stream Channel Tidal Channels Accretion Beaches Lagoon Bedrock Transport Zone Accretion Beach Transport Zone Example of Nearshore Complexity

15 Pocket Estuary Change Pocket estuaries are much smaller and more fragmented than historically. Rearing opportunity for fry migrants Chinook in pocket estuary habitat has been greatly reduced (86% loss in habitat fish use directly). Restoration opportunities exist at pocket estuary sites.

16 The Fish Coho Salmon From G. Pess Steelhead From B. McMillian Chinook Salmon From C. Geene

17 Our Fish are Diverse! Chinook Salmon Freshwater Estuary Ocean 1-4 wks 1-6 mos days 1-2 mos 3-6 mos days wks 1 yr 2 yr 3 yr 4 yrs 5 yrs 6 yrs 1-2 yrs days After Wissmar and Simenstad 1998

18 Juvenile life history variation Subyearlings (ocean type) Yearlings (stream type) River residency (mos.) Delta residency (mos.) Size at outmigration (mm) Delta fry Fry migrants Parr migrants 1-2 <

19 Why do we care? Life history variation buffers population from catastrophes Erika oil spill in 1999 Mt St. Helens, 1980 Young Reporters for the Environment Erika oil spill, 1999

20 Spawning and egg incubation

21 Adult coho salmon redds/ km Spawning: What do the fish tell us? coho Forced pool-riffle Plane-bed Pool-riffle Pool spacing (Bankfull channel widths per pool) Chinook salmon redds per km Montgomery et. al Chinook Forced pool-riffle Plane-bed Pool-riffle Pool spacing (Bankfull channel widths per pool) ~33% of the historic forced pool-riffle channel types have converted to plane-bed channel types due to a lack of wood.

22 Forced Pool Riffle

23 Plane Bed

24 Freshwater rearing by juveniles Photo by N. Forbes

25 Freshwater Rearing Juvenile Chinook Gravel bar edge: 0.44 fish/m 2 Mid-channel: fish/m 2 Bank edge: 0.97 fish/m 2 (natural) 0.4 fish/m2 (hydro mo Slough: 0.07 fish/m 2 Backwater pool : 1.68 fish/m 2

26 Juvenile Coho Edge Cover Type Summer Parr Winter Presmolt No Cover Boulder Cobble Plants NA 0.0 Rip rap (larger rocks) Rip rap (smaller rocks) Wood (all types combined) bankroots debris piles single logs rootwads

27 Juvenile Steelhead Age 0+ Cover Type Summer Winter No Cover Boulder Cobble Plants NA 0.0 Rip rap (larger rocks) Rip rap (smaller rocks) Wood (all types combined) bankroots debris piles single logs rootwads

28 Estuary use by Chinook salmon and Does restoration work?

29 Deepwater Slough Juvenile Chinook Salmon Response A - Blind Channel Habitat, 2001 D - Distributary Channel Habitat, 2001 Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 March April May June July Reference Treatment Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 Mar Apr May Jun Jul Reference Treatment B - Blind Channel Habitat, 2002 E - Distributary Channel Habitat, 2002 Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 March April May June July Reference Treatment Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 Mar Apr May Jun Jul Reference Treatment C - Blind Channel Habitat, 2003 F - Distributary Channel Habitat, 2003 Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 March April May June July Reference Treatment Wild juvenile Chinook salmon per hectare 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 Mar Apr May Jun Reference Treatment

30 Use of habitat by species is diverse Juvenile salmonid density (fish/m2) steelhead (+1,+2) chinook (0) coho (0,+1) estuary mainstem sidechannel ponds tributaries

31 Perspective for Chinook Recovery Perspective for Chinook Recovery recovery trajectory 2010 no continued loss, but not recovery better than current, but still negative current trend Historic Future Ecosystem Services Low High

32 Pie chart of selected H s for meeting the Skagit Chinook Recovery Plan Goals Contribution of General Actions to Achieve Skagit Chinook Recovery Goals 3% 23% Habitat Protection 7% 61% Upper watershed process restoration Freshwater Rearing Restoration Estuary Restoration Local Nearshore Restoration 6%

33 Photo by Todd Bennett The End