Individual study: Does pond quality limit frogs Rana arvalis and Rana temporaria in agricultural landscapes? A field experiment
Loman J. & Lardner B. (2006) Does pond quality limit frogs Rana arvalis and Rana temporaria in agricultural landscapes? A field experiment. Journal of Applied Ecology, 43, 690-700
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
A replicated, before-and-after study in 2003–2008 of 18 ponds within agricultural landscapes in western Scania, southern Sweden (Loman & Lardner 2006) found that although translocation of moor frog Rana arvalis and common frog Rana temporaria eggs initially resulted in breeding populations, they were extinct within five years. Common frog calling males were found at two ponds, eggs in eight and metamorphs in 12 release ponds. Moor frog calling males were found at one pond, eggs at five and metamorphs at nine ponds. Numbers of egg clumps peaked after two years. However, four years after the translocation, breeding was recorded in only two ponds and one year later those populations were extinct. Eggs were collected from south Scania and introduced into eight ponds in 2003 and 10 ponds in 2004 in six areas. Each pond received 20 egg clumps from each species. Ponds were monitored for metamorphs in June–July. Release ponds and other ponds within 750 m were monitored annually.