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Providing evidence to improve practice

Individual study: Internal cave gating for protection of colonies of the endangered gray bat (Myotis grisescens)

Published source details

Martin K.W., Leslie D.M., Payton M.E., Puckette W.L. & Hensley S.L. (2003) Internal cave gating for protection of colonies of the endangered gray bat (Myotis grisescens). Acta Chiropterologica, 5, 143-150


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 Bat Conservation

A replicated, before-and-after study in 1981–2001 at five caves in a limestone plateau in northeastern Oklahoma, USA (Martin et al 2003) found that after cave gates were installed the number of gray myotis bats Myotis grisescens increased at two caves and remained similar at three caves. After cave gates were installed, the number of gray myotis bats was estimated to increase at two caves (before: 3,031–15,047 bats; after: 12,500–32,136 bats) and remain similar at three caves (before: 3,693–18,031 bats; after: 3,721–9,533 bats). At each of six caves, gates were installed (horizontal angle-iron bars and 150 mm spacing) in different years between 1981 and 2000. Numbers of gray myotis bats in each of six caves were estimated during the summers of 1981–1983, 1991, 1999 and 2001 from the size of guano accumulation.

(Summarised by Anna Berthinussen)