Table 9.
Migration distances and lifespan of captive-reared tagged monarchs released into smoky or non-smoky air at Brookings, Oregon during August–October 2017. All recoveries made at overwintering sites except where noted.
| Tag # | Sex | Release Date |
AQI (Air Quality Index) |
Recovery Date/Location | Post-Release Length of Life (Days) |
Migration Distance (km) |
|---|---|---|---|---|---|---|
| Smoky: unhealthy air (AQI > 100) | ||||||
| B3729 | M | Aug 24 | 200 (estimate) | Sep 24 Vacaville, CA (pre overwintering) | 31 | 455.4 |
| B3745 | M | Aug 28 | 198 | Nov 15, Natural Bridges, Santa Cruz, CA | 80 | 597.1 |
| B5307 | M | Aug 31 | 200 (estimate) | Oct 9, Lighthouse Field, Santa Cruz, CA | 161 | 595.5 |
| B3859 | M | Sep 6 | 304 | Oct 20, Lighthouse Field, Santa Cruz, CA | 164 | 618.0 |
| MEAN ± SE | 225.5 ± 26.2 | 109 ± 32.5 | 566.5 ± 37.4 | |||
| Non-smoky: healthy air (AQI < 100) | ||||||
| B5072 | F | Sep 19 | 30 | Nov 24, Muir Bch, CA | 66 | 487.6 |
| B5317 | M | Oct 6 | <50 | Jan 12, Bolinas, CA | 98 | 521.4 |
| C4091 | F | Oct 6 | <50 | Jan 18, Lighthouse Field, Santa Cruz, CA | 104 | 638.9 |
| C4094 | M | Oct 6 | <50 | Nov 24, Natural Bridges, Santa Cruz, CA | 48 | 606.7 |
| B5321 | M | Oct 7 | <50 | Jan 18, Lighthouse Field, Santa Cruz, CA | 103 | 595.5 |
| MEAN ± SE | <46 ± 4.0 | 83.8 ± 11.3 | 570.0 ± 28.2 |