Difference between revisions of "Natal Origins Project (NO)"

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'''2016'''
 
'''2016'''
−
*[Natal Origins of Rainbow Trout Project, Years 1-4 (Nov 11 – Dec 15)]
+
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/index.html Natal Origins of Rainbow Trout Project, Years 1-4 (Nov 11 – Dec 15)]
  
 
'''2015'''
 
'''2015'''
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_02,.pdf GCMRC Science Update - Trout]
 
 
*[[2015 News about the declining fish status at Fishery| Update on the 2015 decline in fish condition and abundance at Lees Ferry]]
 
*[[2015 News about the declining fish status at Fishery| Update on the 2015 decline in fish condition and abundance at Lees Ferry]]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_14.pdf State of the Fishery Lees Ferry and Lees Ferry and Marble Canyon Rainbow Trout Update]
 
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_12.pdf Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_12.pdf Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_18.pdf Rainbow Trout Growth, Condition, Population Dynamics and Modeling in Glen Canyon]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jan20/Attach_18.pdf Rainbow Trout Growth, Condition, Population Dynamics and Modeling in Glen Canyon]
Line 117: Line 115:
 
'''2014'''
 
'''2014'''
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14oct28/Attach_12.pdf New Insights on Trout from the Natal Origins Study]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14oct28/Attach_12.pdf New Insights on Trout from the Natal Origins Study]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/14aug27/index.html Fisheries Update]
 
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jan30/AR_Yard_Korman_NO.pdf Natal Origins update]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jan30/AR_Yard_Korman_NO.pdf Natal Origins update]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jan30/AR_Yard_Korman_NO.pdf Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jan30/AR_Yard_Korman_NO.pdf Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon]
  
 
'''2013'''
 
'''2013'''
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13nov06/Attach_02a.pdf GCMRC Update - Status of Resources and Sediment Conditions]
 
−
*[https://www.usbr.gov/uc/rm/amp/amwg/mtgs/13aug08/Attach_08.pdf Science Update: Fisheries]
 
−
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/13jun26/Attach_07b.pdf GCMRC Science Update on Sediment and Fisheries]
 
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/4_Anderson.pdf Rainbow trout monitoring update]
 
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/5_Yard.pdf Natal Origins update]
 
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/5_Yard.pdf Natal Origins update]
−
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/4_Anderson.pdf Grand Canyon Rainbow Trout 2012 Monitoring Results]
 
 
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/5_Yard.pdf Natal Origins: Glen Canyon and Marble Canyon]
 
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/13jan24/5_Yard.pdf Natal Origins: Glen Canyon and Marble Canyon]
  

Revision as of 16:37, 26 April 2017
NatalOrigins.jpg
  • There is a low probability for an individual fish to move large distances.
  • Abundance is a key factor: the more fish upstream in the Lees Ferry reach = more fish will move downstream
  • Recruitment in the reach below the LCR can be accounted for solely by immigrants from upstream sources (little to no local recruitment at the LCR)
  • Food limitation lead to the collapse in the trout population, and by extension also likely happened in the downstream reaches.
  • Inflow hydrology and reservoir limnology likely govern the quality and quantity of nutrients supplied to the downstream river segments.
  • Nutrient limitation is hypothesized as being the “BIG HAMMER” to the riverine ecosystem, which needs to be evaluated in greater detail in future research.
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--
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Updates

ReachAbundances.jpg
[1]


EmigrationLargeRecruitmentEvents.jpg
Episodic movement occurs under periods of high recruitment (lots of little trout looking for a place to live)

[2]


EmigrationEnvironmentalStressor.jpg
Episodic movement occurs under periods of environmental stress (poor conditions) [3]


NOconclusions.jpg
[4]

Links and Information

Background

Initial investigations found:

  • Efficacy of Mechanical Removal is dependent on immigration levels
  • RBT abundance was high and variable, partially offset by trout immigration
  • BNT were more predaceous than RBT
  • RBT were more numerous than BNT
  • Predation risk is a function of both density & predatory behavior

Information Needs:

  • What controls trout abundance?
  • Where were RBT migrants originating from?
  • What controls trout abundance?
  • Where were RBT migrants originating from?
  • How many sub-adult HBC move into the mainstem?
  • How variable was subadult HBC survival?
  • Was there a relationship between HBC survival & RBT abundance?

Outcomes:

  • Develop alternative sampling methods for determining trout and chub abundance and vital rates
  • Natal Origin Project: Movement and Trout dynamics
  • NSE/JCM Projects: Juvenile HBC survival and other regulating factors

Presentations and Papers

2017

2016

2015

2014

2013

Other Stuff
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