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Table 2 Mean larval burden sizes of I. ricinus and I. trianguliceps found on bank voles at every altitude during 2017 and 2018 in Lifjell and Lærdal.

From: High-elevational occurrence of two tick species, Ixodes ricinus and I. trianguliceps, at their northern distribution range

Altitude (m a.s.l.) Ixodes sp. Lifjell Lærdal
2018 2017 2018 2017
Spring Summer Autumn Spring Summer Autumn Spring Summer Autumn Spring Summer Autumn
100 I. ricinus 0.3 ± 0.7 0.8 ± 1.0 0.2 ± 0.5 19.0 ± NA 0.0 ± 0.0 4.8 ± 5.3 84.0 ± 25.2 19.7 ± 20.3 10.5 ± 9.8 43.3 ± 32.6 6.3 ± 4.6 2.1 ± 1.6
I. trianguliceps 1.3 ± 2.2 0.2 ± 0.7 1.6 ± 3.4 0.0 ± NA 1.0 ± 1.4 4.6 ± 6.5 0.3 ± 0.6 0.1 ± 0.3 0.6 ± 15 0.0 ± 0.0 0.2 ± 0.4 1.6 ± 2.8
200 I. ricinus 15.0 ± 10.9 8.1 ± 7.4 2.9 ± 1.6 NA NA NA 23.8 ± 9.8 13.2 ± 9.1 8.9 ± 4.9 31.6 ± 25.0 19.4 ± 19.1 4.3 ± 3.0
I. trianguliceps 0.4 ± 1.0 0.0 ± 0.0 0.9 ± 1.1 NA NA NA 0.0 ± 0.0 0.3 ± 0.7 0.4 ± 08 0.5 ± 0.9 0.1 ± 0.3 1.4 ± 3.5
300 I. ricinus 1.1 ± 0.7 1.5 ± 2.4 0.6 ± 1.4 NA NA NA 19.5 ± 13.7 3.1 ± 3.3 0.7 ± 1.1 10.6 ± 6.9 2.8 ± 4.0 0.5 ± 0.7
I. trianguliceps 0.0 ± 0.0 0.0 ± 0.2 1.6 ± 2.8 NA NA NA 0.0 ± 0.0 0.0 ± 0.0 0.7 ± 14 0.2 ± 0.4 0.2 ± 0.4 0.4 ± 1.0
400 I. ricinus 0.9 ± 1.3 0.9 ± 1.9 0.0 ± 0.0 0.5 ± 1.0 0.0 ± 0.0 0.0 ± NA 8.1 ± 7.3 1.6 ± 1.6 0.2 ± 0.6 9.5 ± 15.3 1.0 ± 1.4 0.3 ± 0.6
I. trianguliceps 0.3 ± 0.6 0.6 ± 1.1 2.3 ± 4.9 0.5 ± 0.6 0.0 ± 0.0 4.0 ± NA 0.0 ± 0.0 0.0 ± 0.2 0.3 ± 05 0.3 ± 0.5 0.6 ± 1.2 1.2 ± 3.3
500 I. ricinus 0.5 ± 0.8 0.1 ± 0.4 0.0 ± 0.2 0.5 ± 1.2 NA NA 14.5 ± 8.0 4.1 ± 2.6 0.0 ± 0.2 12.7 ± 10.5 2.6 ± 3.2 1.0 ± 1.8
I. trianguliceps 0.3 ± 0.6 0.5 ± 0.9 1.5 ± 3.9 1.2 ± 1.3 NA NA 0.1 ± 0.3 0.3 ± 1.4 0.5 ± 1.9 0.1 ± 0.3 1.4 ± 4.3 1.6 ± 2.3
600 I. ricinus 0.2 ± 0.4 1.1 ± 1.2 0.1 ± 0.3 0.0 ± NA 0.0 ± 0.0 NA 13.8 ± 12.9 1.6 ± 1.5 0.0 ± 0.0 2.1 ± 2.6 0.4 ± 0.9 0.2 ± 0.4
I. trianguliceps 0.4 ± 0.7 0.1 ± 0.9 0.5 ± 1.1 0.0 ± NA 0.5 ± 0.7 NA 0.1 ± 0.4 0.0 ± 0.0 0.1 ± 0.3 0.3 ± 0.8 0.5 ± 0.9 0.7 ± 1.1
700 I. ricinus 2.8 ± 7.9 0.0 ± 0.0 0.0 ± 0.0 NA 0.0 ± NA NA 2.0 ± 3.3 1.4 ± 1.9 0.0 ± 0.0 0.3 ± 0.6 0.4 ± 0.9 0.0 ± 0.0
I. trianguliceps 0.0 ± 0.0 1.3 ± 5.9 0.2 ± 0.5 NA 0.0 ± NA NA 0.3 ± 0.8 0.1 ± 0.5 0.1 ± 0.4 0.0 ± 0.0 0.2 ± 0.4 1.1 ± 3.0
800 I. ricinus NA NA 0.0 ± 0.0 0.0 ± 0.0 NA 0.0 ± 0.0 NA 0.2 ± 0.4 0.0 ± 0.0 0.2 ± 0.4 0.4 ± 0.9 0.2 ± 0.4
I. trianguliceps NA NA 0.2 ± 0.7 0.0 ± 0.0 NA 2.0 ± 1.4 NA 0.1 ± 0.4 0.5 ± 1.0 0.0 ± 0.0 0.0 ± 0.0 1.0 ± 2.4
900 I. ricinus NA 0.1 ± 0.4 0.0 ± 0.0 NA NA NA NA 0.9 ± 0.9 0.0 ± 0.0 NA 0.0 ± 0.0 NA
I. trianguliceps NA 0.1 ± 0.4 0.3 ± 0.8 NA NA NA NA 0.0 ± 0.0 0.1 ± 0.6 NA 0.2 ± 0.7 NA
1000 I. ricinus NA 0.2 ± 0.4 0.0 ± 0.0 NA 0.0 ± NA 0.0 ± NA 0.0 ± 0.0 0.0 ± 0.0 NA 0.0 ± NA 0.0 ± 0.0
I. trianguliceps NA 0.0 ± 0.0 0.4 ± 0.5 NA 0.0 ± NA 0.0 ± NA NA 0.0 ± 0.0 0.2 ± 0.4 NA 0.0 ± NA 0.0 ± 0.0
  1. Values are presented as the mean ± standard deviation
  2. NA indicates either that no voles were captured, or that not enough data were available to compute a standard deviation