Study

Population trends of cave-dwelling bats in the Eastern Iberian Peninsula and the effect of protecting their roosts

  • Published source details Machado M.C., Monsalve M.A., Castello A., Almenar D., Alcocer A. & Monros J.S. (2017) Population trends of cave-dwelling bats in the Eastern Iberian Peninsula and the effect of protecting their roosts. Acta Chiropterologica, 19, 107-118

Actions

This study is summarised as evidence for the following.

Action Category

Install fencing around cave entrances to restrict public access

Action Link
Bat Conservation

Install and maintain cave gates to restrict public access

Action Link
Bat Conservation
  1. Install fencing around cave entrances to restrict public access

    A replicated, site comparison study in 1997–2014 of 34 caves in eastern Spain (Machado et al. 2017) found that installing fencing or cave gates did not have a significant effect on the occupancy or population growth rates of nine bat species. Average occupancy rates were similar in caves with (11 of 20, 57% of caves occupied) and without (8 of 14, 60% of caves occupied) gates or fencing (separate results for cave gates and fencing not reported). Population growth rates also did not differ significantly between caves with or without fencing or gates (data reported as statistical model results). Fourteen caves had fencing installed (2.5 m high gridded metal fences in a 20 m radius around the cave entrance), two caves had rigid panels installed (filling three-quarters of the cave entrance), two caves had iron bars installed (filling the entire cave entrance), and two caves had cave gates installed (with 2 x 1 m2 openings for bats). Fourteen caves did not have fencing or gates installed. Bats were counted annually using infrared video cameras and bat detectors at cave entrances between May and July in 1997–2014.

  2. Install and maintain cave gates to restrict public access

    A replicated, site comparison study in 1997–2014 of 34 caves in eastern Spain (Machado et al. 2017) found that installing cave gates or fencing did not affect the occupancy or population growth rates of nine bat species. Average occupancy rates were similar in caves with (11 of 20, 57% of caves occupied) and without (8 of 14, 60% of caves occupied) gates or fencing (separate results for cave gates and fencing not reported). Population growth rates also did not differ significantly between caves with or without gates or fencing (data reported as statistical model results). Fourteen caves had fencing installed (2.5 m high gridded metal fences in a 20 m radius around the cave entrance), two caves had rigid panels installed (filling three-quarters of the cave entrance), two caves had iron bars installed (filling the entire cave entrance), and two caves had cave gates installed (with 2 x 1 m2 openings for bats). Fourteen caves did not have gates or fencing installed. Bats were counted annually using infrared video cameras and bat detectors at cave entrances between May and July in 1997–2014.

Output references

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