An Update on CWF’s Northern long-eared Bat Statewide Mist Netting Surveys

by Stephanie Feigin, Wildlife Ecologist

Female Northern long eared bat (c) Ethan Gilardi

White-nose Syndrome (WNS), a fungal disease, has devastated bat populations across the country. Over six million bats have been killed by the disease, which has spread to over 25 states and five Canadian provinces. The Northern long-eared bat is one of the species most affected by WNS, suffering from an overwhelming 99% reduction in numbers in WNS-affected areas.

Stephanie Feigin checks wing of a Northern long-eared bat for signs of white nose syndrome scarring. (c) Ethan Gilardi

As a result, in April 2015, the U.S. Fish and Wildlife Service listed the Northern long-eared bat as federally threatened under the Endangered Species Act.

This summer, CWF Wildlife Ecologist Stephanie Feigin teamed up with NJDEP Division of Fish and Wildlife and Rutgers University to conduct a statewide mist netting and radio telemetry project to learn more about the summer distribution and habitat selection of Northern long-eared bats; an important project that can shed light on a species we know all too little about.

Mist-netting surveys began the week of June 1 and continued through the beginning of August. Survey sites included five state parks and Wildlife Management Areas across the state:

• Sparta Mountain Wildlife Management Area
• Rockaway River Wildlife Management Area
• Washington Crossing State Park/Alexauken Creek Wildlife Management Area
• Brendan Byrne State Forest
• Wharton State Forest

The team, directed by Feigin, conducted a total of 19 netting nights and 10 tracking days, leading to a total of 63 bats caught, four of which were Northern long-eared bats. All four of the Northern long-eared bats received radio transmitters and were tracked everyday until the transmitter fell off.

Female Northern long-eared bat with transmitter attached to her back. (c) Stephanie Feigin

After a long night of netting (5pm-2am) the team would set out the next day to track the bat caught the night before. This, however, was not an easy task. The maximum distance the antenna can receive a signal from the transmitter is ¾ of a mile (in perfect conditions). Though tough, the team was able to track the bats to five different roost sites including under the cedar siding of two homes, a narrow four foot stump, a large standing dead pitch pine, and another pitch pine in a recently burned forested area.

The mist netting and tracking study allowed us to collect important data on Northern long-eared bat populations throughout New Jersey. The data collected on habitat requirements and roost locations will help guide our conservation decisions. Ultimately, the study will allow us to better protect the remaining population of Northern-long eared bats in the Garden State.

Amanda Bevan, Rutgers University graduate student, scans area with ATS scanning receiver and Yagi 3-element antenna for a signal from the transmitter (c) Stephanie Feigin

This work was made possible with the support from the Franklin Parker Conservation Grants, EarthColor, and the Conserve Wildlife Matching Grant Program. Thank you to our supporters!

Learn more:

• Conserve Wildlife Foundation’s Bat Project
• White-nose Syndrome
• Conserve Wildlife Foundation’s Online Field Guide: Northern Long-eared Bat
• Northern Long-eared Bat Protected under Endangered Species Act

Stephanie Feigin is a Wildlife Ecologist for the Conserve Wildlife Foundation of New Jersey.