CCA ordination of Odonata and environmental water properties. Odonata taxa are marked with black circles and environmental variables with arrows. Arrow lengths on the ordination show the relative importance of the explanatory variables (environmental properties), and their direction, relative to each other and to the sites, indicates positive or negative correlations. Environmental variable abbreviations are the following: Oxygen (%) = oxygen saturation; ∑N = total nitrogen (mg N/L); pH; Temp = water temperature (°C); NH₄ ⁺ = ammonium concentration (mg N/L). Pla pen = Platycnemis pennipes; Gom vul = Gomphus vulgatissimus; Ony for = Onychogomphus forcipatus; Cal vir = Calopteryx virgo; Ort alb = Orthetrum albistylum. Coe. Gen sp. = Coenagrionidae juveniles, Gom. juvenile = Gomphidae juveniles; Zygop. juvenile = Zygoptera juveniles; Libel. juvenile = Libellulidae/ Corduliidae juveniles.