A Combination of Camera and Pitfall Traps: A Method for Monitoring Ground-Dwelling Invertebrates in Farmlands

Ground-dwelling invertebrates are crucial for maintaining biodiversity, soil health, and food production in agricultural ecosystems; however, their diversity is declining globally. Despite advancements in data science and modern monitoring technology, conventional methods remain predominant in the current field investigations of ground-dwelling invertebrates in farmlands. This study aimed to develop simple, convenient, and automated methods to assess ground-dwelling invertebrate biodiversity in farmlands. Both camera and pitfall traps were used to monitor ground-dwelling invertebrates in two farmlands in Ningbo City, China. Over four experimental periods, lasting 34 days in the vineyard farmland and 32 days in the watermelon farmland, the camera traps detected a relatively high density of invertebrates, although the relative dominance of ant density was overestimated in both farmlands. Both methods revealed similar temporal dynamics of the ground-dwelling invertebrates during the four periods in the vineyard farmland. However, only camera traps recorded the temporal dynamics of the invertebrates at daily, hourly, and minute resolutions in both farmlands. Conclusively, this study demonstrates that combining camera and pitfall traps provides an effective method for monitoring the temporal dynamics of ground-dwelling invertebrates in farmlands, offering high-quality data useful for ecological research and biodiversity protection in agricultural management.