Forage Fish and the Puget Sound Food Web, a Science Cafe presentation
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KCTS- and Pacific Science Center-sponsored Science Cafe talk. The Swiss Pub, Tacoma, WA "Forage Fish and the Puget Sound Food Web"
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Forage Fish and the Puget Sound Food Web, a Science Cafe presentation
- 1. Tessa Francis, PhD University of Washington Tacoma Puget Sound Institute Forage Fish & the Puget Sound Food Web
- 2. An ecologist at work
- 8. litterfall
- 10. BRANDON COLE / WWW.BRANDONCOLE.COM! Redorbit.com!
- 11. The mysterious decline of ! Puget Sound herring!
- 13. Forage fish are 30-‐60 /mes more valuable in the water Source: DFW 2008, TCW Economics; LenFest Forage Fish Task Force Report Direct value Suppor/ve value $25 million $0.4 – 0.8 million
- 14. Pacific herring Clupea pallasii photo by Walter Rung Surf smelt Hypomesus preCosus photo by Frank Varga Sand lance Ammodytes hexapterus photo by Ground Truth Trekking Meet the fish.
- 15. 0 3,000 6,000 9,000 12,000 15,000 18,000 1973 1978 1983 1988 1993 1998 2003 2008 2013 2018 TONS Puget Sound Herring Abundance photo by Walter Rung
- 16. Photo by Madeline Stevens
- 17. No change Decrease Increase Eelgrass bed trends (2004-‐2009) 33% of shoreline altered 25% of shoreline armored 2005-‐2010 Rate of new armoring: 1.8 km/yr
- 19. Does the road to herring recovery go through eelgrass? Rodger Jackman/ geUyimages.com
- 20. Are herring (spawning) habitat limited?
- 21. 1. Which spawning habitat is the highest quality? 2. Are herring limited by the amount of this high quality habitat?
- 22. Puget Sound Herring Spawning Sites 1. Egg Loss on spawning habitat 2. Egg survival in the lab
- 23. Days Since Spawn Egg Density 1 14 Days Since Spawn Egg Density 1 14
- 24. Little effect of habitat on egg loss Daily Egg Loss Rate
- 25. Propor/on of Eggs Hatched EB PM HH CP QB 1.0 0.0 0.2 0.4 0.6 0.8 Hatch rates vary across spawning sites.
- 26. Probabilityofhatching Site effects are stronger than habitat effects
- 27. What We Learned 1. WHERE maUers more for herring egg success than ON WHAT 2. While eelgrass is important in Puget Sound, eelgrass recovery may not impact herring popula3ons.
- 28. Next Steps Why does egg success vary across site?
- 30. Thank you.