Preventing Disturbance of Bat Hibernation Sites

Preventing Disturbance of Bat Hibernation Sites

Even before the widespread incidence and threats of White-nose syndrome (WNS) were known, human disturbance to bats while they hibernate has been a well-documented threat in the Northeast. Many of the pre-WNS conservation efforts focused on better protection of critical winter habitat for bats, which can include caves, abandoned mines, sinkholes, aqueducts and other locations natural or man-made where bats overwinter. Management actions can improve the structures for bats while preventing human disturbance.

Mine gate

The New Hampshire Fish and Game Department’s Nongame and Endangered Wildlife Program installed a new gate at a mine in New Hampshire through funding from the RCN grants program and matching funds from the NH Conservation License Plate Program. The gate keeps bats inside protected from human disturbance during hibernation.

New Hampshire Game and Fish Department

Bats in the Northeast have suffered steep population declines since 2006-2007 due to WNS. Protection of winter habitats for bats, even those infected with WNS, is an important component of long-term conservation actions for the species. Monitoring of survivorship of WNS infected bats in the Northeast has suggested bats may be showing increased resistance to fungal exposure. Therefore, reducing additional threats to the bats might allow rebounding populations to respond more quickly, and ensures that sites receiving future fungal treatment or WNS management efforts will be secure and safe habitats for hibernating bats.

Another major step to keeping these winter habitats safe for bats is raising awareness of these conservation actions through consistent messaging. The combination of site protections, habitat enhancements and improved messaging/signage at the sites should help enhance survivorship of bats in these over-wintering habitats.

In 2016, the Regional Conservation Needs Grants Program (RCN) awarded funding to project leaders in Connecticut, New Jersey, New Hampshire, Pennsylvania and Rhode Island to increase the suitability of identified bat winter hibernation sites by reducing human disturbance. Project funds supported construction or improvements of gates to the openings in caves and mines, structural enhancements to the sites to create better habitats, installation of a sign template for consistent messaging and the placement of remote sight surveillance if needed.

These on-the-ground efforts included many stakeholders and matching funds through in-kind services. A list of the projects is below, links to the individual reports and more information can be found at

State/Priority Locations Description
CT/1 Tory's Cave Sinkhole, 20 ft entrance. Build arched gate.
CT/2 Roxbury Iron Mine Abandoned mine with existing gate. Relocate gate out of water/ice area
CT/3 Crystal Lake Aqueduct entrance. Build gate with horizontal bars
CT/4 Old Newgate Prison Former mine. Modify existing gate.
CT/5 Unnamed Cave, Twin Lakes Sinkhole. Build cupola gate.
CT/6 Hells Hole, Twin Lakes Sinkhole. Build gate and roof structure.
NH Paddock Copper Mine Abandoned mine. Build gate.
NJ/1 Hibernia Mine Abandoned mine. Remove existing gate, remove concrete wall, build new plywood wall for air control, renovate and reinstall gate.
NJ/2 Beach Glen Mine phase 1/2 Abandoned mine. Re-open blocked tunnel. Build gate for entrance.
PA/1 Dunbar Mine 1 and 2 Abandoned mine, 30 x 40 ft entrances. Both sites: Construct barrier wall, build small gate on top of barrier.
PA/2 Ruth Cave Solution cave. Replace existing steel plate gate with bat-friendly version.
RI Fort Camera installation


Photo Credit
New Hampshire Game and Fish Department
November 16, 2018