Lizards unplugged: a methodology study on radiotelemetry equipment for monitoring small–medium reptilian species

Radiotelemetry has emerged as a crucial tool in wildlife biology, enabling researchers to monitor animal movements and behaviours in their natural habitats. While extensively used across various taxa, there remains a scarcity of studies dedicated to optimising radiotelemetry techniques for reptiles, especially small–medium lizard species (50–400 mm total length). In this study, the efficacy of two radio transmitters (Lotek PIP5 and Telemetrie-Service Dessau models) and different attachment methods on sand lizards inhabiting vineyard ecosystems were investigated. We evaluated three harness designs adopted over two years of fieldwork, the Adapted Rappole-Harness (ARH), Shoulder Harness (SH), and Axillary Harness (AH), considering methodological details, attachment longevity, signal range and strength, potential behavioural effects, threats to lizards’ health and survival. Our results indicated that the ARH model was unsuitable, as lizards quickly removed it after few minutes. The SH remained attached for a maximum of 10 days, while the AH lasted up to 17 days, withstanding adverse environmental conditions and terrain abrasion. This study provides valuable insights into optimising radiotelemetry techniques for small–medium reptile species. By considering harness design, attachment location, materials and transmitter shape, researchers can enhance the welfare of tagged individuals and improve the efficiency of telemetry studies. Furthermore, this research underscores the need for standardised guidelines for transmitter attachment in reptiles, promoting animal welfare and advancing scientific understanding in this field. Sharing experiences and collaborating within the scientific community will foster progress in developing effective and ethical transmitter attachment protocols for small–medium reptiles.