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Table 1 Locomotor activity rhythms of R. robustus II and R. prolixus in constant darkness

From: Rhodnius prolixus and R. robustus (Hemiptera: Reduviidae) nymphs show different locomotor patterns on an automated recording system

  Species Mann-Whitney test
R. robustus II R. prolixus U P
N 33 64
Proportion of rhythmic insects (%) Total 69.70 78.13
SRa 21.21 46.88
WRa 48.48 31.25
Free-running period length (Mean ± SD)b τ23 23.17 ± 0.07 23.10 ± 0.06 NS NS
τ1–10 23.37 ± 0.17 23.15 ± 0.12 NS NS
τ11–23 24.29 ± 0.48 23.16 ± 0.24 347.5 0.0069
Power levels (Mean ± SD)c Power 23 606.4 ± 71.96 799.0 ± 59.53 381.5 0.0219
Power 1–10 329.5 ± 37.19 472.3 ± 41.27 379.5 0.0206
Power 11–23 330.7 ± 34.97 398.7 ± 29.04 NS NS
  1. aSR-“Strongly rhythmic”. Proportion of insects (%) whose power levels were above 500. WR-“Weakly rhythmic”. Proportion of insects (%) whose power levels were below 500. See results for details
  2. bFree-running period length (in hours ± SEM) was calculated in three different time windows: (i) considering all 23 days under DD (τ23); (ii) the first ten days (τ1–10); and (iii) the last thirteen days (τ11–23). See Methods for details
  3. cThe power of the rhythm was defined as the amplitude from the peak to the cutoff line (α = 0.05) in the χ 2 periodogram (Liu et al. [32]). See methods for details. The power level was calculated in three different time windows. Power 23: considering all 23 days under DD. Power 1–10: the first ten days. Power 11–23: the last thirteen days
  4. NS,- non-significant