Rhonda Kranz; Friends of Sligo Creek; Patuxent Wildlife Research Center (USGS). 6/5/2016
| Table 1. Highlights of 2013 & 2014 Sligo Bee Survey | Table 2. Relative Impact of Species Density on Total | Table 3. Species Found in Highest Density | |||||||||||||||||||||||||
2013 | 2014 | 2013 & 2014 | # Indiv | # spp | % total invid | % total spp | > 100 indiv. | > 200 indiv. | |||||||||||||||||||
# | A Meadow | B Mowed | In Both A+B | Total A + B | A Meadow | B Mowed | In Both A+B | Total A + B | Total | Date | 2013 | 2014 | Total | 2013 | 2014 | Total | 2013 | 2014 | Total | Species | 2013 | 2014 | Total | ||||
Individuals | 1033 | 846 | 1879 | 816 | 1223 | 2084 | 3963 | > 100 | 5 | 6 | 11 | 70 | 65 | 56 | 6 | 8 | 11 | Agapostemon virescens | 282 | 335 | 617 | ||||||
Species | 77 | 67 | 69% | 85 | 54 | 61 | 60% | 72 | 97 | 1 | 20 | 13 | 20 | 1.1 | 0.6 | 0.5 | 23 | 18 | 21 | Lasioglossum imitatum | 154 | 283 | 437 | ||||
Species found in A or B only (*one year only) | 19 | 9 | 28 | 12 | 18 | 30 | *35% | Highest Density spp | 1 | 1 | 1 | 15 | 16 | 16 | 1.1 | 1.5 | 1 | Ceratina strenua | 202 | 177 | 379 | ||||||
Genera | 25 | 20 | 78% | 27 | 22 | 24 | 77% | 26 | 27 | Augochlorella aurata | 107 | 176 | 283 | ||||||||||||||
Genera found in A or B only (*one year only) | 0 | 1 | 1 | 2 | 4 | 6 | *7% | Lasioglossum hitchensi | 251 | 277 | |||||||||||||||||
Families | 4 | 5 | 5 | 4 | 4 | 4 | 5 | Halictus confusus | 138 | 229 | |||||||||||||||||
Andrena barbara | 114 | ||||||||||||||||||||||||||
A = portion of ROW between Sligo Creek and 16th Place: section mowed once a year or less to allow development of shrub meadow grassland
B = portion of ROW between Sligo Creek and East-West Highway: customarily mowed two or more times per season.
Bee survey supervised by ecologist Rhonda Kranz in cooperation with the Friends of Sligo Creek and the Patuxent Wildlife Research Center
Survey done using "bee bowl trap" protocol provided by Patuxent Wildlife Research Center, US Geological Survey
Identification carried out by staff and volunteers at the USGS Patuxent Wildlife Research Center Bee Inventory and Monitoring Lab under supervision of Sam Droege