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Scientific Investigations Report 2012–5016


Dispersal of Larval Suckers at the Williamson River Delta, Upper Klamath Lake, Oregon, 2006–09


Table 3. Characteristics of the net catches in the drift at Modoc Point Road bridge and for three different gear types, Upper Klamath Lake, Oregon, 2006–09. 


[Relative numbers of LRS and SNS in the drift determined with a Wilcoxon test (p <0.05). Abbreviations: CPUE, catch per unit effort; LRS, Lost River sucker; SNS, grouping of shortnose and Klamath largescale suckers; m3, cubic meter; >, greater than; <, less than; ~, not different from]


Year Restoration
status
Modoc Point Road bridge1   Pop nets2   Larval trawls3   Plankton nets4
Mean CPUE (fish per m3) Relative numbers of LRS and SNS Mean CPUE in pop nets (fish per net) Percent LRS Mean CPUE in larval trawls (fish per net) Percent LRS Mean density of LRS (fish per m3) Mean density of SNS (fish per m3)
2006 Levees intact 2.57 LRS ~ SNS 20.2 37 13.5 26.2
2007 Levees intact 3.69 LRS > SNS 9 23 4.6 8.1
2008 Levees breached around Tulana 2.56 LRS < SNS 8.3 18 4.5 8.9 0.44 0.08
32009 Levees around breached Goose Bay 6.86 LRS > SNS 3.95 11 2.5 28.9 0.004 0.06

12006 and 2007 larval drift data from Ellsworth and others, 2009; 2008 larval drift data from Ellsworth and others, 2011; 2009 larval drift data from unpublished results.


22006 and 2007 pop net data from Hendrixson, 2008; 2008 pop net data from Erdman and Hendrixson, 2009; 2009 pop net data from Erdman and Hendrixson, 2010.


32008 plankton net data from Burdick and others, 2009; 2009 plankton net data from Burdick and Brown, 2010.


4Larval trawl data from unpublished results.

First posted April 2, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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