Species Richness and Diversity of Resident and Migratory Landbirds in Remnant Forest Patches and Residential Areas in the Florida Keys, USA
Table 1
Description and quantification (mean and standard deviation, median and range) of site and landscape variables at protected and residential sites where bird surveys were conducted (20-m fixed radius point counts) in the Florida Keys during March–May 2004 and 2005.
Variable
Description
Protected sites
Unprotected sites
Mean
SD
Median
Range
Mean
SD
Median
Range
PCT_HAM
Site variable: percent cover of native hammock canopy with intact understory
96
8
100
65–100
18
30
0
0–100
PCT_CAN
Site variable: percent cover of native hammock tree canopy cover with cleared understory
<1
1
0
0–6
18
16
15
0–65
PCT_LAWN
Site variable: percent cover of residential lawn (turfgrass, ornamental plantings, pavement, and structures)
1
2
0
0–10
10
11
6
0–35
PCT_OTHER
Site variable: percent cover of nonhammock vegetation (e.g., marsh, mangroves, pinelands)
<1
2
0
0–8
1
5
0
0–27
D2HAM
Landscape variable: distance (m) to closest hammock (if survey site was located within a hammock, D2HAM = 0)
0
0
0
0
59
83
26
0–417
SIZEHAM
Landscape variable: size (ha) of closest hammock (if survey site was within a hammock, the size of that hammock was recorded)
