Nest odor changes connected with season and parasite presence in P. biglumis nests

Data collected in the field, analyzed with SPSS statistic. Px = Peak number x; FACx = Principal Component x; Perc x = Percentage of the peak x; QTot = Total concentration of hydrocarbons; IdNest = Sample ID; dx = right side; sx = left side; mtg = Montgenèvre, fer = Ferrere;