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SUPPORTING INFORMATION
Additional supporting information may be found online in the Supporting Information section.
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Appendix S1. Predatory processes in the present study.
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Table S1. The number of ambrosia beetles provided for earwig individuals on each date.
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TABLE 1 Information on the ambrosia beetles used in this experiment
Body length
(mm)a
Collection
methods
2.0–2.6
Trap
13/0
0/13/0
XC
2.4–2.7
Maple trees or
Trap
6/0
0/6/0
XB
2.5–3.0
Maple trees or
Trap
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0/28/18
2.6–3.0
Rearing artificial
8/0
diets
3/5/0
E. interjectus
3.4–3.8
Fig trees or
Rearing artificial 79/29
diets
31/29/48
Scolytoplatypus
mikado
2.9–3.8
Maple trees or
Trap
36/1
30/6/1
2.7–4.0
Maple trees or
Trap
42/3
32/10/3
3.5–4.1
Trap
6/0
0/6/0
3.6–4.0
Maple trees or
Trap
9/0
0/9/0
3.3–4.5
Maple trees or
Trap
17/0
0/17/0
237/58
96/129/70
Beetle species
Abbreviation Sex
Xylosandrus
germanus
XG
Xylosandrus
crassiusculus
Xylosandrus
brevis
Euwallacea
interjectus
EI
SM
S. mikado
Euwallacea
validus
EV
Scolytoplatypus
tycon
ST
S. tycon
Total
Hayashi et al., 1984.
412
413
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No choice/choice AM1/AM2/AM3
414
415
TABLE 2 Summaries of GLMMs with predator as random variable and attacking duration or
percentage of beetles consumed as target variable
Estimate/
Variance
Std. Error/
Std. Dev.
Z-value
Pr(>|z|)
Intercept
−0.01476
0.46382
−0.032
0.975
Body size
0.50924
0.06280
8.109
< 0.001
0.4655
0.6823
0.6023
0.3854
1.563
0.118
0.4829
0.1296
3.725
< 0.001
0.1417
0.3764
Parametric coefficients
Attacking duration (AIC = 872.7)
Fixed effects
Random effect
Predatora
Percentage of beetles consumed (AIC = 227.3)
Fixed effects
Intercept
Body size
Random effect
Predatora
416
417
418
Estimate for the random effect of predator.
X. brevis (♀), E. interjectus (♀) and S. mikado (♀&♂).
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420
Figure 1 Layout of the predatory processes between predator and prey
421
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Figure 2 Process of earwig preying on ambrosia beetle.
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(a), Simultaneous release of predator and prey; (b), walking or staying put; (c), touching the beetle
425
body with antenna; (d), cutting it with forceps; (e), eating the contents with mouth organs; (f), finishing
426
(leaving exoskeleton after completion of predation)
427
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429
Figure 3 Pre-attack duration in each beetle species in the no-choice test (total n = 139).
430
The overall difference in medians among the species (n ≥ 5) is not significant at P > .05 using
431
Kruskal–Wallis test. SD, standard deviation
432
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433
434
Figure 4 Attack duration in each beetle species in the no-choice test (total n = 129).
435
The overall difference in medians among the species (n ≥ 5) is significant at P < .01 using
436
Kruskal–Wallis test. Means with different letters (a, b) are significantly different at the 1% level. SD,
437
standard deviation.
438
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440
Figure 5 Percentage of male and female beetles consumed in each beetle species in the no-choice test
441
(total n = 149).
442
n.s., not significant at P > .05 using Mann–Whitney U test; SD, standard deviation
443
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445
446
Figure 6 Percentage of alive or dead (within 2 days) cases of beetles consumed in each beetle species
447
in the no-choice test (total n = 237).
448
*: Statistically significant at P < .05 using Mann–Whitney U test; n.s., not significant at P > .05 using
449
Mann–Whitney U test; SD, standard deviation
450
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452
Figure 7 Prey preference between two different species in the choice test (total n = 58).
453
*: Significant at P < .01 using Fisher's exact test
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