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Use of wet, air-dried, or oven-dried bulk mass to quantify insect numbers: an assessment using Chilothorax distinctus (Müller) (Coleoptera: Scarabaeidae)
Published online by Cambridge University Press: 15 January 2020
Abstract
We examined the use of bulk mass to predict the number of individuals in samples of the dung beetle Chilothorax distinctus (Müller) (Coleoptera: Scarabaeidae: Aphodiinae: Aphodiini). We first developed linear regression equations to characterise the relationship between the number of beetles in a sample and sample wet mass, air-dried mass, or oven-dried mass. We then applied these equations to samples containing unknown numbers of beetles to obtain a predicted number. The predicted number was subsequently compared to the number obtained by counting each beetle by hand. Wet mass was as suitable as air-dried or oven-dried mass to estimate beetle numbers and was quicker to obtain. The predicted number of beetles in individual samples based on wet mass deviated from the actual number by 0.6–19.9%. For results combined across samples, the discrepancy was 2.2%. We conclude that quantifying C. distinctus by bulk wet mass rather than by hand count provides a reasonable alternative that accelerates the pace of sample processing while providing substantial cost savings. These results add to the small body of literature assessing the accuracy of bulk insect mass as a predictor for the actual number of individuals in large samples of conspecifics.
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- © Her Majesty the Queen in Right of Canada 2020
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Subject editor: Rayda Krell
References
Atkins, E.L. 1986. Volumetric method for quantifying the number of honey bees collected in dead bee traps. Applied Agricultural Research, 1: 112–114.Google Scholar
Bertone, M., Green, J., Washburn, S., Poore, M., Sorenson, C., and Watson, D.W. 2005. Seasonal activity and species composition of dung beetles (Coleoptera: Scarabaeidae and Geotrupidae) inhabiting cattle pastures in North Carolina. Annals of the Entomological Society of America, 98: 309–321.CrossRefGoogle Scholar
Bezanson, G.A. 2019. Assessing the effect of habitat, location and bait treatment on dung beetle (Coleoptera: Scarabaeidae) diversity in southern Alberta, Canada. M.Sc. thesis. University of Lethbridge, Lethbridge, Alberta, Canada. Available from https://opus.uleth.ca/handle/10133/5399 [accessed 6 November 2019].Google Scholar
Brousseau, P.M., Cloutier, C., and Hébert, C. 2010. Selected beetle assemblages captured in pitfall traps baited with deer dung or meat in balsam fir and sugar maple forests of central Quebec. Environmental Entomology, 39: 1151–1158.CrossRefGoogle ScholarPubMed
Brown, G.R. and Matthews, I.M. 2016. A review of extensive variation in the design of pitfall traps and a proposal for a standard pitfall trap design for monitoring ground-active arthropod biodiversity. Ecology and Evolution, 6: 3953–3964.CrossRefGoogle Scholar
Fiene, J.G., Connior, M.B., Androw, R., Baldwin, B., and McKay, T. 2011. Surveys of Arkansas dung beetles (Coleoptera: Scarabaeidae and Geotrupidae): phenologies, mass occurrences, state and distributional records. American Midland Naturalist, 165: 319–337.CrossRefGoogle Scholar
Fincher, G.T., Stewart, T.B., and Davis, R. 1970. Attraction of coprophagous beetles to feces of various animals. The Journal of Parasitology, 56: 378–383.CrossRefGoogle Scholar
Floate, K.D. 1998. Does a repellent effect contribute to reduced levels of insect activity in dung from cattle treated with ivermectin. Bulletin of Entomological Research, 88: 291–297.CrossRefGoogle Scholar
Floate, K.D. and Gill, B.D. 1998. Seasonal activity of dung beetles (Coleoptera: Scarabaeidae) associated with cattle dung in southern Alberta and their geographic distribution in Canada. The Canadian Entomologist, 130: 131–151.CrossRefGoogle Scholar
Gordon, R.D. and Skelley, P.E. 2007. A monograph of the Aphodiini inhabiting the United States and Canada (Coleoptera: Scarabaeidae: Aphodiini). Memoirs of the American Entomological Institute, 79: 1–580.Google Scholar
Holter, P., Sommer, C., Grønvold, J., and Madsen, M. 1993. Effects of ivermectin treatment on the attraction of dung beetles (Coleoptera: Scarabaeidae and Hydrophilidae) to cow pats. Bulletin of Entomological Research, 83: 53–58.CrossRefGoogle Scholar
Howden, H.F. and Nealis, V.G. 1975. Effects of clearing in a tropical rain forest on the composition of the coprophagous scarab beetle fauna (Coleoptera). Biotropica, 7: 77–83.CrossRefGoogle Scholar
Kadiri, N., Lumaret, J.-P., and Floate, K.D. 2014. Functional diversity and seasonal activity of dung beetles (Coleoptera: Scarabaeoidea) on native grasslands in southern Alberta, Canada. The Canadian Entomologist, 146: 291–305.CrossRefGoogle Scholar
Rentz, E. and Price, D.L. 2016. Species diversity and succession of dung beetles (Coleoptera: Geotrupidae and Scarabaeidae) attracted to horse dung on Assateague Island. The Coleopterists Bulletin, 70: 95–104.CrossRefGoogle Scholar
Rounds, R.J. and Floate, K.D. 2012. Diversity and seasonal phenology of coprophagous beetles at Lake City, Michigan, USA, with a new state record for Onthophagus taurus (Schreber) (Coleoptera: Scarabaeidae). The Coleopterists Bulletin, 66: 169–172.CrossRefGoogle Scholar
Spector, S. and Ayzama, S. 2003. Rapid turnover and edge effects in dung beetle assemblages (Scarabaeidae) at a Bolivian neotropical forest-savanna ecotone. Biotropica, 35: 394–404.Google Scholar
Stark, J.D. and Vargas, R.I. 1990. Comparison of sampling methods to estimate the number of oriental fruit fly and melon fly (Diptera: Tephritidae) captured in traps. Journal of Economic Entomology, 83: 2274–2278.CrossRefGoogle Scholar
Tiberg, K. and Floate, K.D. 2011. Where went the dung-breeding insects of the American bison? The Canadian Entomologist, 143: 470–478.CrossRefGoogle Scholar
Viegas, G., Stenert, C., Schulz, U.H., and Maltchik, L. 2014. Dung beetle communities as biological indicators of riparian forest widths in southern Brazil. Ecological Indicators, 36: 703–710.CrossRefGoogle Scholar