Individual study: Habitat management and global warming positively affect long-term (1987-2011) chorus counts in a population of the European tree frog (Hyla arborea)
van Buggenum H.J.M. & Vergoossen W.G. (2012) Habitat management and global warming positively affect long-term (1987-2011) chorus counts in a population of the European tree frog (Hyla arborea). Herpetological Journal, 22, 163-171
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Create ponds for frogs
A before-and-after study in 1978–2011 of 10 created ponds within a nature reserve on historic clay pits and farmland in Limburg, the Netherlands (van Buggenum & Vergoossen 2012) found that pond creation, along with vegetation clearance, increased the breeding population of European tree frogs Hyla arborea. Numbers of males increased from 50 to 150–400. Numbers increased with increasing pond area. Ponds (100–450 m2) were created in 1983, 1985 and 1993. Vegetation removal was also undertaken. Calling males were surveyed two to four times in April–May each year.