Table 1. Predictive variables used in
modeling, acronyms, and data summaries. Sample point mean and range for
each study area are shown as years combined. Abundance of insect orders
is expressed as catch-per-unit-effort; all other variables show units in
parentheses. No artificial mean is derived for ordinal and binary variables,
shown as "na." Variables not measured in Iowa and Wisconsin study areas
are denoted by --.
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Nova
Scotia |
Iowa |
Wisconsin |
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| Acronym |
Variable description |
Mean |
Range |
Mean |
Range |
Mean |
Range |
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Invertebrate Abundance
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| ARA |
Aranea in pitfalls |
10.5 |
0.6-38.1 |
-- |
-- |
-- |
-- |
| CHI |
Chilopoda in pitfalls |
0.1 |
0-0.9 |
-- |
-- |
-- |
-- |
| COLS |
Coleoptera in sweeps† |
5.4 |
0-113.0 |
-- |
-- |
-- |
-- |
| COLP |
Coleoptera in pitfalls† |
10.6 |
1.0-110.6 |
-- |
-- |
-- |
-- |
| DIP |
Diptera in sweeps |
7.1 |
0-39.6 |
-- |
-- |
-- |
-- |
| DIPL |
Diplopoda in pitfalls |
0.1 |
0-1.5 |
-- |
-- |
-- |
-- |
| HEMI |
Hemiptera in sweeps |
13.6 |
0-74.3 |
-- |
-- |
-- |
-- |
| HYM |
adult Hymenoptera in sweeps |
1.0 |
0-7.0 |
-- |
-- |
-- |
-- |
| ISO |
Isopoda collected in pitfalls |
3.4 |
0-189.7 |
-- |
-- |
-- |
-- |
| LEP |
adult Lepidoptera in sweeps |
1.2 |
0-8.3 |
-- |
-- |
-- |
-- |
| LHL |
LEP and HYM larvae
in sweeps |
2.2 |
0-11.0 |
-- |
-- |
-- |
-- |
| LUM |
Lumbricina in pitfalls |
0.2 |
0-2.4 |
-- |
-- |
-- |
-- |
| ODO |
Odonata in sweeps |
0.5 |
0-4.4 |
-- |
-- |
-- |
-- |
| OPIL |
Opiliones in pitfalls |
0.2 |
0-1.1 |
-- |
-- |
-- |
-- |
| ORTH |
Orthoptera in sweeps |
0.5 |
0-6.5 |
-- |
-- |
-- |
-- |
| STY |
Abundance of Stylommatophora
in pitfalls |
0.3 |
0-7.0 |
-- |
-- |
-- |
-- |
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Vegetation |
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| ALF |
Presence/absence of Alfalfa |
na |
na |
-- |
-- |
-- |
-- |
| COV |
Live vegetative cover in a
frame (%) |
69.7 |
24.5-100 |
84.0 |
55.1-99.5 |
69.8 |
28.8-100 |
| FORB |
Forb cover in a frame (%) |
23.4 |
0-96.3 |
26.3 |
0-8.5 |
29.5 |
0-81.3 |
| GR |
Grass cover in a frame (%) |
76.6 |
3.8-100 |
52.2 |
8.2-81.1 |
70.5 |
18.8-100 |
| HD |
Height/density (dm) of May
vegetation |
3.0 |
1.0-7.5 |
4.7 |
1.2-12.2 |
0.9 |
0-3.1 |
| SPT |
Presence/absence of Spartina
spp. (cordgrass) |
na |
na |
-- |
-- |
-- |
-- |
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Other |
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| DIT |
Length of ditch (m) in point-count
plot |
2.8 |
0-11.5 |
-- |
-- |
-- |
-- |
| HARV |
Harvest date in the current
year |
6 Jul |
6 Jun-15
Aug |
-- |
-- |
-- |
-- |
| HPY |
Harvest date in the preceding
year |
5 Jul |
6 Jun-15
Aug |
-- |
-- |
-- |
-- |
| Pcbobo
|
Conditional detection probability
for Bobolink |
0.44 |
0.42-0.45 |
-- |
-- |
-- |
-- |
| Pcsavs
|
Conditional detection probability
for Savannah Sparrow |
0.41 |
0.4-0.45 |
-- |
-- |
-- |
-- |
| Pcnsts
|
Conditional detection probability
for Nelson’s Sparrow |
0.40 |
0.35-0.42 |
-- |
-- |
-- |
-- |
| YR |
2002, 2003, or 2004 |
na |
na |
-- |
-- |
-- |
-- |
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† COLS and COLP represent prey abundance
estimates from the same taxonomic order, but were considered as separate
variables because they reliably sampled different families (Elateridae (click
beetles) by sweeps, and Carabidae (ground beetles and tiger beetles) by
pitfalls).
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