Influence of climatic factors on Ixodes ricinus nymph abundance and phenology over a long-term monthly observation in Switzerland (2000–2014)

Table 1 Descriptive statistics for nymph density from 2000 to 2014. Yearly mean, maximum and minimum densities of field-collected questing nymphs during the study period

Year	Mean density	Maximum density	Minimum density	Cumulated density (CND)
2000	30.49	100.48	0.19	11,147.38
2001	38.60	146.71	0.10	14,697.43
2002	36.66	132.22	1.14	12,564.97
2003	36.03	163.11	0.10	13,612.82
2004	30.22	105.62	1.62	9295.09
2005	22.34	49.95	4.10	5649.52
2006	38.73	159.68	0	13,735.11
2007	17.04	51.48	0	6999.33
2008	35.47	106.39	0	12,769.21
2009	30.22	134.51	0	11,227.26
2010	20.36	69.32	0	6683.16
2011	32.69	97.09	0	10,830.31
2012	17.52	61.24	0.19	6457.33
2013	22.40	96.38	0	8221.73
2014	17.62	49.71	0	6385.29

Notes: Densities are indicated in number of questing nymphs per 100 m². Cumulated nymph density (CND) is calculated as the area under the density curve over the years. For this latter measure only (CND), fictive null samplings were considered (see Methods for details)

ISSN: 1756-3305