Table 1.
Variation in the duration of TI (time) and number of disturbances (encounters) required to elicit TI among life stages and feeding status for two species of ticks, Dermacentor variabilis and Rhipicephalus sanguineus
| Species | Months since feeding and emergence | Status | Life stage | Encounters, mean ± SD | Time (s), mean ± SD | Unresponsive (n) | Responsive (n) | Total (n) | Proportion of unresponsive individuals |
|---|---|---|---|---|---|---|---|---|---|
| Dermacentor variabilis | 1 | Unstarved | Adult | 4 ± 3 | 67.5 ± 38.4 | 10 | 78 | 88 | 0.11 |
| Dermacentor variabilis | 6 | Starved | Adult | 9 ± 4 | 4.4 ± 3.7 | 77 | 11 | 88 | 0.88 |
| Dermacentor variabilis | 2 | Unstarved | Nymph | 3 ± 1 | 4.9 ± 2.4 | 0 | 80 | 80 | 0.00 |
| Dermacentor variabilis | 5 | Partial | Nymph | 4 ± 2 | 1.1 ± 0.7 | 3 | 56 | 59 | 0.06 |
| Dermacentor variabilis | 9 | Starved | Nymph | 3 ± 2 | 1.2 ± 1.0 | 1 | 79 | 80 | 0.01 |
| Rhipicephalus sanguineus | 1 | Unstarved | Adult | 4 ± 2 | 25.6 ± 31.9 | 1 | 49 | 50 | 0.02 |
| Rhipicephalus sanguineus | 6 | Starved | Adult | 5 ± 3 | 5.1 ± 3.1 | 6 | 44 | 50 | 0.12 |
Number of unresponsive individuals indicates the number of individuals that did not exhibit TI after 10 simulated predator encounters and are therefore excluded from the analysis of encounters and time. Values are means ± SD. See text and Fig. 1 for statistical details.