FIGURE 1 in Coexistence of two newt species in a transition zone of range overlap

FIGURE 1 Land use map of the study area in the western part of the department Pas de Calais in the northwest of France (see insert), after Curado et al. (2011) and Arntzen et al. (2017). The small-bodied newt species Lissotriton helveticus and L. vulgaris are frequently syntopic (for data see table 1), but have different strongholds in and outside the 'Dunes de la Slack' and the bomb crater areas, respectively. The partial spatial separation is illustrated by dotted contour lines where L. vulgaris is at 60% (red dots), 50% (purple dots) or 40% (blue dots) of the Lissotriton total. Note the position of the study pond at the species transition.