Giant Beaver Palaeoecology Inferred from Stable Isotopes

• Published in: Scientific Reports
• Main Authors: Plint, Tessa, Longstaffe, Fred J, Zazula, Grant
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Scholarship@Western 2019
• Subjects: Castoroides; giant beaver; stable isotopes; palaeoecology; Pleistocene; North America; Earth Sciences; Geochemistry; Natural Resources and Conservation; Other Environmental Sciences; Paleobiology; Ice Sheet; Beringia
• Online Access: https://ir.lib.uwo.ca/earthpub/33; https://doi.org/10.1038/s41598-019-43710-9; https://ir.lib.uwo.ca/context/earthpub/article/1035/viewcontent/Plint__T._et_al.__2019_.pdf

This is a multi-individual (n = 11), stable carbon and nitrogen isotope study of bone collagen (δ13Ccol and δ15Ncol) from the giant beaver (genus Castoroides). The now-extinct giant beaver was once one of the most widespread Pleistocene megafauna in North America. We confirm that Castoroides consumed a diet of predominantly submerged aquatic macrophytes. These dietary preferences rendered the giant beaver highly dependent on wetland habitat for survival. Castoroides’ δ13Ccol and δ15Ncol do not support the hypothesis that the giant beaver consumed trees or woody plants, which suggests that it did not share the same behaviours as Castor (i.e., tree-cutting and harvesting). The onset of warmer, more arid conditions likely contributed to the extinction of Castoroides. Six new radiocarbon dates help establish the chronology of the northward dispersal of the giant beaver in Beringia, indicating a correlation with ice sheet retreat.