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Fig. 8 | Parasites & Vectors

Fig. 8

From: Spread and establishment of Aedes albopictus in southern Switzerland between 2003 and 2014: an analysis of oviposition data and weather conditions

Fig. 8

Relationship between egg numbers and covariates in the sentinel traps of the Ticino Aedes albopictus surveillance since 2006. The multi-panel scatterplots show the egg counts on each slat from the 46 sentinel ovitraps as a function of the four covariates; year, month, rain and temperature. Rain was calculated as the cumulative precipitation over the week before collecting the slat and temperature accordingly as the mean temperature during the preceding week. A LOESS smoother (red line) was added to aid visual interpretation. The visual inspection indicates an increase in egg counts over the years and a seasonal maximum in August. The variable “rain” was split into three levels, represented by the vertical blue stippled lines. The levels were “low”, “middle” and “high” with 0–104 mm, over 104 to 209 mm and over 209 to 314 mm, respectively. Note that egg counts are plotted on a logarithmic scale; and hence zero counts are not shown due to points at infinity

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