Research Article
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 |
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