Status and Trend of Regal Fritillary (Speyeria idalia) (Lepidoptera: Nymphalidae) in the 4th of July Butterfly Count Program in 1977–2014

Table 3

Results of linear regressions and Spearman rank correlations of dependent variables versus year. NS = not significant.

	Linear regression standardized coefficient (R)	P	Spearman rank correlation coefficient (R)	P
1977–2014 ( years)
Percent counts per year with Regal reported:
North America	−0.358	0.0272	−0.303	<0.10
Main range	−0.514	0.0010	−0.482	<0.01
Core range	−0.022	0.8899	−0.509	<0.01
Percent counts per year in main range reporting:
100 Regal individuals	+0.285	0.0827	+0.309	<0.10
500 Regal individuals	+0.008	0.7621	+0.088	NS
Regal individuals reported that year divided by:
N counts that year in circles ever reporting Regal	+0.264	0.1094	+0.210	NS
N counts held in main range	+0.074	0.6580	+0.091	NS
Total party-hours on all counts in core range	−0.106	0.5281	−0.014	NS
Highest Regal total on a single count	+0.528	0.0007	+0.472	<0.01
1991–2014 ( years)
Percent counts per year with Regal reported:
North America	−0.561	0.0043	−0.527	<0.01
Main range	−0.405	0.0497	−0.383	<0.10
Core range	−0.244	0.2511	−0.255	NS
Percent counts per year in main range reporting:
100 Regal individuals	−0.528	0.0080	−0.563	<0.01
500 Regal individuals	−0.677	0.0003	−0.671	<0.01
Regal individuals reported that year divided by:
N counts that year in circles ever reporting Regal	−0.571	0.0036	−0.517	<0.01
N counts held in main range	−0.590	0.0024	−0.523	<0.01
Total party-hours on all counts in core range	−0.611	0.0015	−0.600	<0.01
Highest Regal total on a single count	−0.496	0.0136	−0.519	<0.05