Table 3.

Monthly density of nymphs (DON) per 100 m² for the four elevation sites on Chaumont Mountain over the 15 years of the study (2004–2018)

Site	Years	N	DON Mean	DON StdDev	DON Range	CND	DON2
Low	15	144	74.4	82.6	0.00–430.0	22,629	62.0
Medium	15	144	61.4	75.0	0.00–385.8	18,849	51.6
High	15	137	42.7	52.0	0.00–257.5	12,582	34.5
Top	15	133	10.6	14.5	0.00–80.8	3000	8.2

Shown for each of the four elevation sites are the number of years, sample size (N; units are number of transects), mean, standard deviation, and the range of the monthly DON (units are nymphs per 100 m²). For each elevation site, the expected sample size is 180 transects; missing transects are due to snow days when dragging for ticks was not possible. The DON is biased high due to the missing values for the snow days. In our previous study [15], we calculated the cumulative nymphal density (CND) for each calendar year by integrating the area under the curve of the seasonal phenology of the DON (per 100 m²) from 1 January to 31 December. When this CND is divided by 365 days, it gives a second estimate of the density of nymphs (DON2) that is less biased by the missing snow days. For this reason, the estimates of DON2 are lower than the DON