Abstract
The U.S. Fish and Wildlife Service has adopted two different pitfall trap protocols to survey the endangered American burying beetle, Nicrophorus americanus. One protocol uses a transect of eight pitfall traps that prohibit bait contact over the course of three trap nights. The other protocol uses buckets that allow for bait contact over a five night trapping period. A trap night is defined as one trap open for one night, and the transect protocol has historically been calculated as eight trap nights per calendar night while; the bucket protocol has been calculated as one trap night per calendar night. This study examined the effectiveness of each protocol based on the number of beetles (Nicrophorus spp.) captured per trap night (BTN) in field and laboratory trials. When each transect was considered as a single trap instead of eight separate traps, no significant difference in BTN was detected between the protocols in any year. Laboratory trials were conducted using Nicrophorus marginatus to determine differences in capture efficiency based on protocol, time after release, and feeding status. The proportion of beetles captured after 5 days was greater when compared to 3 days for either protocol. Our results indicate that cup transects used to sample the American burying beetle should be considered as a single trap when calculating trap night and that the use of five trap nights rather than three would increase the likelihood of capturing beetles.
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Acknowledgments
Funding for this study was provided by the Nebraska Department of Roads, U.S. Fish and Wildlife Service, and Nebraska Game and Parks Commission. We wish to thank M. Parenti, A. Koehler, R. Butler and T. L. Duncan for field assistance. The views and opinions of the authors expressed herein do not necessarily state or reflect those of the U.S. Department of Transportation. American burying beetle trapping was conducted under U.S. Fish and Wildlife Service Permit #TE045150-0.
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Butler, S.R., Harms, R., Farnsworth-Hoback, K. et al. Standardized capture rates of the endangered American burying beetle, Nicrophorus americanus Olivier (Coleoptera: Silphidae) using different trap protocols. J Insect Conserv 17, 607–613 (2013). https://doi.org/10.1007/s10841-012-9545-5
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DOI: https://doi.org/10.1007/s10841-012-9545-5