Survey Design for Monitoring North American Native Bees
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This slide show was presented at the 2009 North American Pollinator Protection Campaign meetings in Washington D.C. It was designed to brief the participants about plans to develop a statistically relevant but inexpensive means of determining if our bees are declining. Details can be obtained from Sam Droege (sdroege@usgs.gov).
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Survey Design for Monitoring North American Native Bees
- 1. the problem.
- 2. the world suspects bees are declining Shrill Carder Bumblebee Distribution Data from NBN, with particular thanks to BWARS.
- 3. We donot know if there is a crisis nor have we identified how and where to target our conservation measures because until now, there is NO NORTH AMERICAN MONITORING PROGRAM
- 6. Determine where and how many sites you would need to detect declines
- 8. 24 pan traps per transect 8 blue 8 yellow 8 white Sample every 2 weeks At a minimum, sample every fifth year on a rolling basis methods
- 10. Determine how many sites you would need to detect declines
- 12. good versus bad sampling >80% probability of detecting a change if one is occurring > 1-3% change in population per year
- 13. declines
- 14. How many sites?Detecting a decline in the number of species
- 15. How many sites?Detecting a decline in the abundance of bees
- 16. number of sites with 100 sites, we should be able to detect even a 2% decline in both the abundance and number of species of bees with slightly over 200 sites, we can pick up a 1% decline many individual species can be monitored Wow
- 18. Determine where and how many sites you would need to detect declines
- 21. long-term product Trends for individual species Regional trends Ability to detect large scale crashes for any year Ability to compare to Canadian system Ability to compare to European system Ability to compare to UN-FAO sites
- 22. more long-term product Standardized methodology permits comparisons among sites Patterns of distribution Patterns of abundance Patterns of composition Patterns of fluctuations Community analyses Biogeography analyses
- 23. the cost.
- 24. cost per site Labor Collection a few hours Processing 1/10 of an FTE each site run only every 5 years Supplies and Equipment $2,200
- 25. other costs Full time coordinator for the length of the project
- 27. Determine where and how many sites you would need to detect declines
- 29. 4 separate sampling systems National Forests Fish and Wildlife Service Refuges National Parks Commercial Orchards or other Ag Systems
- 30. usfs
- 32. sampling – For each of the four groups year 1 – 50 new sites year 2 – 50 new sites year 4 – 50 new sites year 5 – first 50 are repeated …und so weiter
- 33. centralized processing 2 sorting, processing, identification, and databasing centers (West and East) 170,000 bees a year between the two Efficiency of scale 1 central coordinator 2 FTE’s doing the specimen processing
- 34. New York Times reports: “Bees in North America NOT declining!” - Laurie Davies Adams, NAPPC 2015