Figure 1

Activity levels (mean ± SE number of lines crossed during 30 min) of non-conditioned (open circles) and conditioned (solid circles) Pelobates cultripes tadpoles, either in clean water or in the presence of chemical cues from invasive crayfish, in six populations from two different regions of the Iberian Peninsula, central and southern Spain. MAN Manzanares, COL Colmenar, STOME Sto. Tomé, ESP Espajosas, JAB Jabata, LLA El Llano.