Table 2. Pilosocereus site characteristics and population numbers 1994–2011 in the Florida Keys. At US Fish and Wildlife Service request, sites are identified by acronyms only.
| Site | Area (ha) | Mean elevation (m) | Stems | % change 1994–2007 | % change 1994–2011 | % change 2007–2011 | Salinity (ppm) 2008 | Salinity (ppm) 2011 | |||||
| 1994 | 2007 | 2008 | 2009 | 2010 | 2011 | ||||||||
| BPKW | 10.618 | 0.68±0.04 | 1960 | 27 | 23 | 14 | 10 | 10 | −99 | −99 | −63 | 566 | 212 |
| BPKE | 2.364 | 1.00±0.03 | 240 | 29 | 25 | 19 | 17 | 21 | −88 | −91 | −28 | 374 | 48 |
| LKGOT | 0.118 | 1.19±0.13 | 16 | 78 | 77 | NS | 87 | NS | 388 | 444 | 12 | 205 | NS |
| LKLT | 0.327 | 1.16±0.15 | 60 | 13 | 13 | 13 | NS | 18 | −78 | −70 | 38 | 719 | 38 |
| LM* ∧ | 0.184 | 1.00±0.07 | 78 | 59 | 57 | NS | NS | NS | −24 | −27 | −3 | 638 | NS |
| UMCO∧ | 0.184 | 1.75±0.12 | 177 | 85 | NS | 50 | 52 | 43 | −52 | −76 | −49 | NS | 98 |
| UMLV | 0.035 | 1.69±0.31 | 14 | 25 | 22 | 21 | 28 | 29 | 79 | 107 | 16 | 364 | 104 |
| KL | 0.026 | 0.52±0.14 | 75 | 112 | NS | 98 | NS | 308 | 49 | 311 | 175 | 2432 | 113 |
Elevation was calculated from LIDAR data provided by Zhang (unpublished); means ±1 S.E. are presented.
∧
Indicates privately owned land; all other sites are public lands.
*
We did not receive permission to survey this private property in this year. Note that KL population is P. bahamensis, while the others are P. robinii. NS = Not Surveyed.