Camera Trap Design Determines Taxa Detected at Carrion Sites

Area of Science:

• Ecology
• Wildlife monitoring
• Biodiversity assessment

Background:

• Camera traps are vital ecological tools for studying vertebrates and invertebrates.
• Variations in camera trap design can introduce detection biases, affecting monitoring accuracy.
• Understanding these biases is crucial for comprehensive food web studies, especially concerning carrion decomposition.

Purpose of the Study:

• To compare the effectiveness of horizontal versus vertical camera trap designs in capturing carrion food web dynamics.
• To determine if camera trap orientation influences estimates of taxonomic richness, community composition, and species associations.
• To identify potential detection biases related to camera trap design for different trophic levels.

Main Methods:

• An experiment was conducted at Panther Swamp National Wildlife Refuge, MS, USA.
• Two camera trap designs (horizontal and vertical) were deployed across 17 carrion sites.
• Data on taxonomic richness, community composition, and associations were analyzed for each design.

Main Results:

• Both camera trap designs yielded similar taxonomic richness estimates.
• Significant differences were observed in community composition between horizontal and vertical trap detections.
• Vertical traps showed higher detection rates for necrophagous invertebrates (blow flies, carrion beetles), while horizontal traps favored white-tailed deer detection.

Conclusions:

• Camera trap design significantly influences the detection of different taxa within a carrion food web.
• A detection bias exists, with vertical designs better suited for invertebrates and horizontal designs for vertebrates.
• Combining horizontal and vertical camera traps is recommended to capture a broader spectrum of species and improve carrion ecosystem monitoring.