Foraging and growth poten/al of juvenile Chinook salmon following /dal restora/on of the Nisqually...
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Transcript of Foraging and growth poten/al of juvenile Chinook salmon following /dal restora/on of the Nisqually...
Foraging and growth poten/al of juvenile Chinook salmon following /dal restora/on of the Nisqually River delta.
September 20, 2013
Aaron David1, Christopher Ellings2, Isa Woo3, Charles Simenstad1, Kelley Turner3, John Takekawa3,
Ashley Smith3, and Jean Takekawa4
1University of Washington, School of Aqua/c and Fishery Sciences 2Nisqually Indian Tribe, Department of Natural Resources 3U.S. Geological Survey, Western Ecological Research Center 4U.S. Fish and Wildlife Service, Nisqually Na/onal Wildlife Refuge
Acknowledgements Jesse Barham Walker Duval MaS Holt
Emiliano Perez Lisa Belleveau Caitlin Guthrie Jus/n Hall Ben Ryken
Peter Markos Sam Stepe/n Kyle Kautz
Eddie Villegas Tom Friedrich
The Wetland Ecosystem Team And many others…
Cartography by Amy Calahan
Funding: US EPA, Nisqually Tribe, US Fish and Wildlife Service, NSF Graduate Research Fellowship Program
Photo: Michael Grilliot
Nisqually River Estuary, Fall 2009
Ques/on: Do restored and reference marshes provide equivalent growth opportuni/es for juvenile Chinook salmon?
Growth is primarily a func/on of: -‐ The amount of prey consumed -‐ The energe/c quality of prey consumed -‐ The temperature regime experienced by a consumer
Tidal channel reconnected in 2009 Unaltered, reference /dal channel
Diet analysis
Fyke trap ne`ng
Consump/on rate study Temperature loggers
Bioenerge/cs model
Bioenerge/cs model
Growth = Consump/on – (Metabolism + Wastes)
Inputs: • Consumer mass • Consump/on rate • Prey energy density • Consumer energy density • Temperature
Results: Chinook salmon densi/es
Results: Diet composi/on
Results: Diet energy density
Results: Stomach fullness
Results: Temperatures
Results: 2010 Growth
Results: 2011 Growth
Results: 2012 Growth
Photo: Jean Takekawa
Conclusions: • Our findings are generally consistent with other
studies of estuary restora/on projects
• The reconnected habitats appear to provide similar, but more variable opportuni/es for Chinook growth
• Increased sensi/vity to air temperatures may limit the growth value of these habitats when temperatures are warm
Es/ma/ng Chinook daily consump/on for each sampling event
•
Number of hours in a day
Gastric evacua/on rate
Mean stomach fullness over the whole day
Mean stomach fullness at the beginning and end of the 24 hour period
Results: Consump/on study