Individual study: Cave gate designs for use in protecting endangered bats
White D.H. & Seginak J.T. (1987) Cave gate designs for use in protecting endangered bats. Wildlife Society Bulletin, 15, 445-449
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Install and maintain cave gates to restrict public access
A small replicated study in 1985 at two caves in Alabama and West Virginia, USA (White & Seginak 1987) found that Townsend’s big-eared bats Plecotus townsendii and gray myotis bats Myotis grisescens flew more frequently through test frames at gated cave entrances with a round bar design or angle iron design than a funnel design. A greater proportion of Townsend’s big-eared bats and gray myotis bats flew through test frames with a round bar design (average 40% of big-eared bats and 20% of gray myotis bats exiting through the cave entrance), or angle iron design (21% of big-eared bats and 16% of gray myotis) than a funnel design (7% of big-eared bats, 2% of gray myotis). At one entrance at each of two caves, a 1 m2 test frame was installed in front of an existing gate with a round bar design. Inserts of three different designs were installed in the frames: round bar (19 mm round steel bars in a 615 x 154 mm pattern), angle iron (103 mm angle iron welded 154 mm apart in a horizontal pattern) and funnel (a 1 m2 one-way metal funnel narrowing to an exit hole of 230 x 230 mm). Each of three designs was tested for a total of 25 nights/cave in May–August 1985. At dusk, bats were counted emerging through the frame and the remainder of the cave entrance.
(Summarised by Anna Berthinussen)