Pacific lamprey biology: critical uncertainties & context
Benjamin J. ClemensOregon Department of Fish & Wildlife
Willamette Falls 1913
Source: Clackamas County Historical Society
Die-off
Temp. > 20 oC
K. Kostow, 2002 ODFW white paper; D. Ward 2001 ODFW report
Tribal Harvest at Willamette Falls
Willamette
Last stronghold?
Example for other basins?
674 mm
525 mm
= “Immature” Males
1 Collection Date
Clemens 2011 Ph.D. dissertation
STREAM MATURING TYPE
OCEAN MATURING TYPE
Clemens 2011 Ph.D. dissertation
Clemens, Wyss, McCoun, Schwabe, Courter, Duery, Vaughn & Schreck 2012 Report to CRITFC
Lamprey Critical Uncertainties• Moser et al. 2007 Rev. Fish Biol. Fish.• Mesa et al. 2009• Luzier et al. 2009• Clemens et al. 2010 Fisheries• Lamprey Tech. Workgroup 2005-2011• U.S. F& WS 2011• CRITFC 2011
*We are certain that we are uncertain!
Photo credit: Jeremy Monroe , Freshwater Illustrated
Lamprey Critical Uncertainties• Biology (basic; stress, disease; pop’n dynamics)
• Population structure (genetics)
• Habitat (use vs. avail; toxics; thresholds; climate change)
• Ecology (abundance, dist., prey, predators; keystone sp?)
• Monitoring (survey, collection, marking)
• Conservation (limiting factors; aquaculture)
• Management (passage, transloc., dredging, dewatering)
Tangible products needed….
Lamprey Critical Uncertainties• Climate change• Human pop’n & economic growth• Ocean conditions• Pop’n structure• Monitoring• Habitat rehab• Predictive modeling• Adaptive management
We are not there…yet.
Context• Science– Explore, Describe, Test, Monitor, Model,
Predict– Synthesize, Integrate, Refine• Status and trend monitoring (patterns)• What does it mean?• Identify biological mechanisms• Connect mechanisms with patterns
Ultimate mechanisms?
Context: Scale