Abstract
Museum collections contain a wealth of insect remains originating from a wide geographic range, which can be used to investigate their utility as a proxy for environmental isotope ratios. Chitinous remains of insects such as beetles (Coleoptera) are chemically stable and their stable isotope composition is strongly related to that of environmental water in the period of cuticle formation. We present a dataset of chitin δD and δ18O in two genera of water beetles from a museum collection containing 40 locations for Helophorus (water scavenging beetles) and 48 locations for Hydroporus (predaceous diving beetles) that were selected from latitudes 27–82°N in North America. Only two genera were used to minimize inter-sample variation caused by species-specific differences in metabolic effects, feeding strategy, habitat, and life cycle. The isotopic composition of water beetle exoskeletons had a strong latitudinal trend (North–South) from −160 to +65 ‰ for δD and from 7 to 34 ‰ for δ18O, paralleling gradients of isotopes in precipitation. Strong relationships were observed between isotopic composition of beetles and modelled July precipitation (0.71 < R 2 < 0.82, p < 0.001). The relationship between δD and δ18O in the beetle samples had a systematic offset from the global meteoric water line, which was likely caused by metabolic effects during chitin formation. The offset between δD values in beetles and in modelled precipitation was 33 ‰ larger, on average, for Hydroporus compared with Helophorus, suggesting fractionation of hydrogen isotopes during passage through the food chain. This trophic level effect was not observed for stable oxygen isotopes. Furthermore, the observed deviations between isotopic composition of water beetles and modelled precipitation at collection sites were not constant and indicated local hydrological deviations from modelled precipitation. The largest deviations were observed for sites in the Southern US and the Arctic that are highly evaporative and at sites in the Rocky Mountains and Coastal Mountains that were fed by snow melt. Our results indicated that the isotopic composition of water beetles from a museum collection was systematically related to δD and δ18O values of precipitation at the collection site.
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Acknowledgments
The museum specimens were kindly provided (i.e. sacrificed) by Dr. P. Bouchard and Mr. A. E. Davies at the Canadian National Collection of Insects, Agriculture and Agri-Food Canada. We thank Jonathan Holmes and three anonymous reviewers for their constructive remarks on earlier versions of this manuscript. Support for van Hardenbroek’s dissertation research was provided by a NERC training grant NE/E522959/1. This project was supported by a grant from the Natural Sciences and Engineering Research Council of Canada Discovery Grant to DRG (No. 288321).
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van Hardenbroek, M., Gröcke, D.R., Sauer, P.E. et al. North American transect of stable hydrogen and oxygen isotopes in water beetles from a museum collection. J Paleolimnol 48, 461–470 (2012). https://doi.org/10.1007/s10933-012-9623-4
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DOI: https://doi.org/10.1007/s10933-012-9623-4