East Park Reservoir

Survey Citation:
Ackerman, J. T., C. A. Hartman, C. A. Eagles-Smith, M. P. Herzog, J. Davis, G. Ichikawa, and A. Bonnema. 2015. Estimating mercury exposure of piscivorous birds and sport fish using prey fish monitoring. Environmental Science & Technology 49:13596–13604.

• Type
  boat
• Time period
  April 2012, October 2013
• Source
  Peer-reviewed
• Both Western and Clarks?
  N/A

Count Type	Range	Max	Year
Max Adults	1 to 100	presence	2012
Most Recent Adults	1 to 100	presence	2012
Max Nests	N/A	N/A	N/A
Most Recent Nests	N/A	N/A	N/A
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

Not a survey but grebes were sampled at 25 lakes in CA from April to October of 2012 (13 lakes) and 2013 (12 lakes). An average of 14 grebes per lake (from 2 to 38 grebes) were captured at night with night-lights. No breakdown of actual numbers captured per lake was provided. Morphometry and molt data, along with blood was collected from each bird for mercury analysis, and sex determination via genetic analysis. From 7 out of the 25 lakes, an average of 14 grebe eggs (from 6 to 23 eggs) were collected. An egg from each randomly sampled nest was collected either from an active nest (random egg) or from an abandoned nest (abandoned egg). Prey fish and sport fish were also sampled an average of 11 days after grebe sampling. At East Park Reservoir, all tissues were collected in 2012 (Figure SI). 354 grebes were captured total from the 25 lakes, 71% were Western grebes, 29% were Clark's, 48% were female, 52% were male. 101 grebe eggs were collected from 7 lakes, of which 62% were Western grebes, 15% were Clark's grebes, 23% were unidentified which. Grebe blood, eggs, and sport fish mercury concentrations were strongly correlated to mercury concentrations in prey fish at the lakes. Grebe mercury concentrations were also strongly correlated with sport fish mercury concentrations. This study showed that prey fish monitoring can estimate mercury exposure of grebes and other piscivorous birds if these birds can't be sampled directly.

Survey Citation:
Ivey, G. L. 2004. Conservation assessment and management plan for breeding Western and Clark’s Grebes in California. Unpublished technical report. American Trader Trustee Council, California. . Accessed 15 January 2020.

• Type
  air
• Time period
  5 August 2003
• Source
  Conservation Assessment, Management Plan
• Both Western and Clarks?
  N/A

Count Type	Range	Max	Year
Max Adults	1 to 100	40	2003
Most Recent Adults	1 to 100	40	2003
Max Nests	1 to 100	20	2003
Most Recent Nests	1 to 100	20	2003
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

Table 3 population estimate is the # of nests (20) x 2 for 40. Represents 1% or less of the grebes at the selected sites (Ivey and Herziger in prep.).

Survey Citation:
Robison, K., R. Weems, and D. Anderson. 2008. Western and Clark's Grebe conservation and management in California. Annual report for year four (2008). Report for American Trader and Kure/ Stuyvesant Trustee Councils and National Fish and Wildlife Foundation, California.

• Type
  shore; air
• Time period
  2008
• Source
  Report
• Both Western and Clarks?
  Y

Count Type	Range	Max	Year
Max Adults	501 to 1000	775	2008
Most Recent Adults	501 to 1000	775	2008
Max Nests	1 to 100	70	2008
Most Recent Nests	1 to 100	70	2008
Max Chicks	1 to 100	76	2008
Most Recent Chicks	1 to 100	76	2008

Comments:

Data from Table 3. Date of surveys not provided. There were about 35 nests in the colony at any one time. Productivity rate from # of adults in sample and # of young in sample. Estimated total # of adults is entered here. No other information provided. Subsequent reports have their own entries.

Survey Citation:
Robison, K., R. Weems, D. Anderson, and F. Gress. 2010. Western and Clark's Grebe conservation and management in California. Annual report (2009). Report for California Institute of Environmental Studies, Davis, California.

• Type
  boat
• Time period
  15 July 2009
• Source
  Report
• Both Western and Clarks?
  Y

Count Type	Range	Max	Year
Max Adults	101 to 500	410	2009
Most Recent Adults	101 to 500	410	2009
Max Nests	0	0	2009
Most Recent Nests	0	0	2009
Max Chicks	0	0	2009
Most Recent Chicks	0	0	2009

Comments:

Data from Table 1. Nesting habitat was dry, grebes couldn't nest. No chick count #s but assuming zero because productivity is zero.