Females of A. viridis mainly lay eggs on the leaves ofStratiotes aloides and occasionally on some other aquatic plants,
such as Typha spp. and Sparganium spp. (Matushkina & Gorb,
2003; Rantala et al., 2004). Adult dragonflies have been found occasionally by
water without S. aloides, but larvae
have only been recorded in lakes with these plants (Rantala et al., 2004). In
accordance with field and laboratory data of the same authors, this is possibly
because the spinyleaves of S. aloides protect effectively A.
viridis larvae against predatory fish (like perch, Perca fluviatilis).
the fast decline during last decades of S.
aloides in Europe due
to eutrophication and environmental
stresses (e.g., Roelofs 1991; Smolders et al. 1996), dragonflies A. viridis become scarcer and disappear from many former