Bat Hibernacula Conservation Biologists

White-nose-syndrome monitoring demands entry-light cave mapping that does not wake torpid colonies, and traditional LiDAR sweeps flood roosts with disturbing light and human presence.

30 articles

Lessons From Karst vs Lava Tube Hibernacula Deployments

Kentucky karst caves and Oregon lava tubes both host Townsend's big-eared bats, but the caves themselves disagree on nearly every dimension — wall chemistry, microclimate stability, geometry, and the acoustic behavior that makes passive reconstruction possible. This post synthesizes lessons from paired EchoQuilt deployments in karst and lava tube hibernacula, and when the same playbook does not transfer.

karst versus lava tube hibernacula, bat cave comparison, karst bat roost, lava tube bat, hibernacula comparison

Long-Term Guano-Floor Geometry Tracking for Cave Ecosystems

A guano pile under a maternity roost grows and compacts on a schedule that reflects the colony overhead, the cave's hydrology, and the bats' diet. At Niah Cave in Borneo, 40,000 years of accumulated guano drove a documented mudflow. This post walks through how to track guano-floor geometry over decades inside an EchoQuilt reconstruction without disturbing the pile.

guano-floor geometry, long-term cave ecosystem, guano stratigraphy mapping, guano sediment tracking, bat guano floor

Advanced Cluster Counting From Passive Acoustic Reconstructions

A dense Indiana bat cluster can reach 300 to 484 bats per square foot. At that density, counting from a floor photograph is a guess with a known error band, and counting from a single microphone is worse. This post walks through how passive acoustic reconstruction scales up to defensible cluster counts, including where the technique stops being reliable.

advanced cluster counting, passive acoustic count, bat cluster estimate, automated count bat, feature extraction acoustic

Cross-Agency Data Sharing Protocols for Threatened-Species Caves

A single Indiana bat hibernaculum in West Virginia can touch a USFWS field office, a state DNR, a tribal wildlife agency, a private landowner, and at least two university research teams. The data-sharing graph is not a question of goodwill; it is a question of ESA Section 7 compliance and site confidentiality. This post works through how to share EchoQuilt data across agencies without leaking cave locations.

cross-agency data sharing, threatened species cave data, federal state bat data, cross-agency wns, cross-disciplinary bat handoff

Evaluating Map Stability Across Repeated Entry-Light Surveys

Annual entry-light surveys can swing bat cluster counts by 22 percent at a stable site, and the swing has more to do with observer, lamp angle, and which ceiling landmark the observer picked than it does with bats. This post works through how to evaluate whether a multi-year quilt is actually stable, or whether its year-to-year differences are method drift.

entry-light survey stability, multi-year cave survey, map fidelity stability, repeat bat survey, consistency entry light

Future Trends in Non-Intrusive WNS Monitoring With Sound Data

The direction the WNS research community is moving — continuous thermal-infrared records of entire winters, sonotype-classified passive acoustic streams, and airborne eDNA sampling at entrances — all points the same way: fewer entries, more sensors. This post walks through the next five years of non-intrusive WNS monitoring and where EchoQuilt fits into that stack.

non-intrusive wns monitoring, future bat conservation, sound-based wns, non-entry bat survey, wns sound data

Species-Specific Acoustic Signatures Inside EchoQuilt Surveys

Myotis lucifugus and Myotis septentrionalis echolocate within a few kilohertz of each other, and inside a mixed-species hibernaculum their chirps braid together on the same spectrograms. This post works through how EchoQuilt threads species-specific acoustic signatures — call shape, interval, and wing-beat envelope — into patches that keep species identity across the whole reconstructed quilt.

species-specific acoustic signature, bat species acoustic, myotis perimyotis signature, species id acoustic cave, bat signature survey

Scaling Passive Roost Mapping Across State Hibernacula Networks

Kentucky has more than 4,000 known caves, and state biologists are responsible for a Priority 1 NLEB and Indiana bat list that runs into the dozens. One biologist with a headlamp cannot anchor all of them in one winter. This post walks through how passive roost maps aggregate into a state-network dashboard that sits on top of a NABat GRTS sampling frame.

state hibernacula network, scaled bat mapping, statewide roost survey, multi-site bat survey, scale conservation mapping

Case Study: Tracking WNS Progression Through Map-Anchored Counts

A Tennessee hibernaculum drops from 1,800 northern long-eared bats to 27 in four winters. The visual counts show year-to-year swings of 40 percent that have nothing to do with bats. This case study follows a three-year EchoQuilt deployment that anchored every cluster to stable ceiling landmarks, so a 98 percent decline read as a decline rather than as measurement noise.

wns progression tracking, map anchored bat count, wns case study, hibernaculum population mapping, wns monitoring case
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