On building a worm detector

A proposal to build a "worm detector" argues that current soil ecology lacks the ability to map earthworm locations and movements at paddock scale, despite their critical role in soil health. Few studies have attempted in-situ movement mapping; the only notable examples measured above-ground trails of Lumbricus terrestris and an invasive flatworm, with L. terrestris recorded travelling a mean minimum of 9.0 m per night (n=30). The case is made that modern sensing and phenomics techniques can fill this gap, shifting focus from abundance surveys to tracking individual and community movement patterns and their ecological implications.

A specific detection concept is outlined: an array of ground probes emitting pulses (analogous to ground-penetrating radar or microwave wavelengths) that register changes in signal strength and frequency as worm abundance varies, combined with GPS-referenced sampling and soil calibration to produce 3D maps or 2D probability heatmaps. Worms’ hydrostatic bodies would provide a distinguishing “fingerprint” from exoskeleton-bearing fauna, and sampling under wet conditions could improve detectability. Practical questions to answer include worm speed, exploratory behavior, burrow longevity, spatial heterogeneity, and applications for precision farm management and root-system visualization, alongside candid acknowledgment of technical challenges such as resolution limits and subsurface positioning.