Figure 2

Relationship between cumulated densities of Culex pipiens egg rafts and degree-days accumulation. Densities of C. pipiens egg rafts (collected egg rafts per container and per collection date) were cumulated throughout collection dates. Cumulated values are presented on a log scale (log(n +1)). Degree-days accumulation (log scale) started with the 1^st January as biofix date. The regression line (full line) has the following equation y = 1.97× -5.15, R² = 0.95. N= 137 days sampled across seasons (April-September) in 2010 (grey circles) and in 2011 (empty circles).