Workflow for Pd Surveillance Cave Visits With EchoQuilt
The Swab Kit That Still Requires Entering the Chamber
A USGS Pd surveillance team steps into a Kentucky hibernaculum in February carrying sterile swabs, sediment tubes, a GPS, and a laminated decon card. They need skin swabs from torpid Myotis lucifugus, guano scrapes from three prior-known Pd-positive clusters, and sediment samples from two wall zones where Pd hyphae last tested positive. Every minute the team spends in the chamber adds thermal load to the air and disturbance to the clusters. Multiply this across the 6-8 surveillance sites that state and federal agencies coordinate each winter, and the annual Pd surveillance program has a real disturbance cost.
The sampling protocols are strict for good reason. USGS White-Nose Syndrome surveillance collects swabs of skin, guano, and sediment from participating agencies, and results feed directly into the national Pd distribution map. Environmental determinants of Pd within hibernacula published in the Journal of Applied Ecology show that sediment Pd loads, wall-substrate moisture, and chamber temperature all contribute to colony-level infection risk. Missing samples produce gaps in the surveillance record that compound across seasons.
The sampling-versus-disturbance tradeoff is unforgiving. Each additional swab station costs additional in-cave time, additional thermal load, additional CO2 release, and additional probability of an arousal cascade. A team trying to be thorough by adding one more sample station per visit ends up with marginally better surveillance data and meaningfully worse colony-level outcomes. The tradeoff bites hardest at WNS-positive sites where the colony is already stressed and arousal cascades are already amplified — exactly the sites where Pd surveillance is most needed. The classical answer has been to limit sample counts and accept the surveillance-data gaps; EchoQuilt's answer is to compress the in-chamber time per sample so that the same sample density costs a fraction of the disturbance.
The workflow constraint is also strict. The national decontamination protocol requires stepwise decon of all field equipment between sites, and NPS backcountry caves require screening, decon, and permitting for every visit. Every Pd swab event is a controlled intrusion, and every intrusion costs torpor arousals across the clusters the team passes. The question for any state bat crew is not whether to do surveillance — it is how to minimize the footprint per site.
Stitching Swab Coordinates Into the Passive Quilt
EchoQuilt does not replace swab collection — Pd DNA has to come from substrate. What EchoQuilt does is pre-map the hibernaculum as a patch-by-patch acoustic quilt before the Pd team arrives, so the in-chamber time drops from 90 minutes to under 20. The quilt stitches ceiling cluster positions, wall microclimate anomalies, and guano-pile footprints into a single 3D patch map. The Pd surveillance team loads the quilt on a tablet at the portal, identifies the six swab stations they need to visit, and walks a pre-optimized route through chambers that the map has already confirmed are active.
This matters because Pd sampling targets specific substrates. A guano pile under a cluster of 40 Myotis lucifugus is a high-value swab site. A sediment patch adjacent to a 92% RH wall zone is a high-value environmental sample. EchoQuilt's passive sensing catalogs cluster positions and environmental patches across weeks of continuous monitoring — when the team arrives, they know which ceiling has a cluster, which wall is wet, and which piles are fresh. No exploratory beam-sweep is needed, so entry-light visits are the default rather than an aspiration.
The workflow also renders site-to-site continuity. Multi-year Pd surveillance data published in Ecosphere reveals pathogen presence factors that only emerge across seasons. EchoQuilt stores each hibernaculum's patch map with timestamped swab-station locations, so when the team returns the next winter, the new quilt overlays the old one. A Pd-positive patch from last February can be resampled at the exact ceiling coordinates this February, producing a longitudinal swab record that isolates substrate-level pathogen persistence from spurious sample variation.
The quilt metaphor matters for team coordination. One tablet shows the quilt. One swab station is one patch. A biologist crosses off patches as samples are collected — the visual feedback matches the quilt's spatial structure, so nothing gets missed and nothing gets double-sampled. The 2-hour visit compresses into a sub-30-minute structured route that preserves sample completeness while cutting cluster disturbance.
Environmental interference matters too. Airflow, dripping water, and temperature gradients affect both acoustic readings and Pd transport dynamics. EchoQuilt's patch map surfaces environmental interference at each swab site, so when the Pd team finds a heavy drip zone above a swab station, that context is documented in the sample record. USGS's 2025-2029 science strategy foregrounds WNS and bat health as multi-year surveillance priorities — a Pd-sampling workflow that produces spatially-anchored, environmentally-contextualized samples feeds that strategy directly.
Advanced Tactics for Pd Workflow Integration
Tactic one: pre-identify swab stations by cluster composite signature. EchoQuilt's patches tag cluster species where possible — a Myotis lucifugus cluster signature looks different from a Perimyotis signature. Species-specific Pd sampling can then target the patches that match the year's surveillance priority.
Tactic two: integrate the decon checkpoint into the tablet interface. Each swab-station completion flags the next decon step. A surveillance team visiting 4 chambers and 6 swab stations in one trip runs 10 scheduled decon events — EchoQuilt's visit log makes the auditable chain-of-custody a side effect of checking off patches.
Tactic three: run passive acoustic surveillance between annual Pd visits. Pd progression does not wait for the next swab event. EchoQuilt's non-intrusive WNS mode runs between visits to extend the surveillance record without additional entries — altered echolocation, altered arousal frequency, altered cluster persistence together give a pathogen-progression signal during the 11 months without swabs. Anomalies trigger an out-of-schedule surveillance visit. The continuous record means that when a swab visit does happen, the team arrives knowing which clusters showed anomalous behavior in the prior weeks and can target swab effort there. This raises the per-swab information yield substantially: a swab at a behavior-flagged cluster has a much higher prior probability of returning a positive Pd result than a swab at a randomly selected cluster, which means surveillance budgets stretch further.
Tactic four: coordinate across agencies on a shared quilt. A single hibernaculum may host USFWS ESA Section 7 review, USGS Pd surveillance, and state DNR count surveys in the same winter. Route all three team visits through one EchoQuilt patch map. Each team crosses off different patches. The visit record consolidates under one timestamp set instead of three overlapping entry events. Cross-agency coordination through the patch map also reduces the overall disturbance budget for the site — three teams collaboratively planning a single visit will design a route that satisfies all three teams' sample needs in one entry, where independent planning would produce three separate entries with overlapping coverage and triple the disturbance.
Tactic five: automate sample-metadata capture from the quilt. Sample ID binds to patch ID, patch ID binds to GPS coordinates, coordinates bind to the cluster composite signature recorded by the array in the week prior. The chain compresses four log-sheet fields into one tablet tap, reducing transcription errors and speeding lab-submission packaging. The metadata structure also satisfies the documentation requirements that USGS lab intake protocols specify, so submitted samples arrive with complete provenance and do not bounce back for missing fields.
Ready to cut Pd surveillance visit time by 70% while improving sample-site fidelity? EchoQuilt integrates with USGS, USFWS, and state DNR Pd-surveillance workflows to give teams a pre-mapped swab route before they open the gate. The pilot program is structured around existing Pd surveillance schedules so participating teams can validate the workflow without changing their reporting commitments. If your WNS program is logging hours of in-chamber time and still missing sample coordinates, this workflow is built for you. Join the Waitlist for Hibernacula Biologists.