Wharton skink shelter DNA — October 1, 2026

Primary source checked

Read Kyle and colleagues, “Combining surface and soil environmental DNA with artificial cover objects to improve terrestrial reptile survey detection”, Conservation Biology (2022), against the author-hosted open-access PDF, especially methods on PDF pp. 3–4, results and Table 1 on pp. 5–6, and interpretation on pp. 7–8. The PMC record is PMCID PMC10087970; its browser endpoint presented a challenge during this review, so the PDF served as the directly read source.

The Wharton array had 82 sites along 1,163 meters, each with metal and plywood cover objects separated by a drift fence. Visual checks were daily in the active season. The eDNA comparison sampled weekly in August–October 2020 and May–June 2021.
A sterilized, dampened paint roller sampled the full ground-facing surface after the visual check. The rinse was filtered and tested with a skink-specific qPCR assay. Field and extraction negative controls were negative.
Of 284 surface-sampling events, 64% were roller positive and 11% visually positive; 65% were positive when methods were combined. The modeled visit-level gain was 3.6–15.8-fold by season and cover material. The entry keeps observed rates separate from the model estimates.
The paper reports 81% positive roller samples when the last visual sighting was 1–14 days earlier, and detections as long as 127 days after the last recorded sighting. This does not measure 127-day survival of a single DNA deposit; a later unseen visit is possible.
Metal covers had more positive roller samples than wood (76% versus 51%). The paper does not isolate whether animal behavior, material, or DNA recovery caused the difference. The soil comparison consisted of 25 samples at 20 selected covers and varied soil quantity between seasons.

The team deliberately targeted sites with a recent sighting under one paired cover, then sampled both covers; fewer than half of covers in the array were sampled by roller in either year. Results cannot be extrapolated into a forest-wide population or occupancy estimate.
A positive trace says DNA was found, not how many animals used the cover or when. The paper explicitly calls for experiments on deposition and decay. Raw assay files and supplements were not independently reanalyzed.
Potential follow-up: locate later experimental work on reptile eDNA persistence under cover objects and determine whether this approach has been used in operational monitoring in the Pinelands. Keep that later evidence separate from what this 2022 study established.
Editorial integration: removed the former map pin, which drew a 15 km circle around Batsto from a community-map point. The article describes one 1,163 m transect in Wharton, not an array spread across that circle, and the paper does not establish a public coordinate for it. The sitewide map explains that some stories lack defensible pin locations.