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Predation impacts of invasive raccoons on rare native species

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Title: Predation impacts of invasive raccoons on rare native species
Authors: Oe, Sakura Browse this author
Sashika, Mariko Browse this author →KAKEN DB
Fujimoto, Ayako Browse this author
Shimozuru, Michito Browse this author →KAKEN DB
Tsubota, Toshio Browse this author →KAKEN DB
Issue Date: 30-Nov-2020
Publisher: Nature Research
Journal Title: Scientific reports
Volume: 10
Issue: 1
Start Page: 20860
Publisher DOI: 10.1038/s41598-020-77016-y
Abstract: In Japan, there are concerns that invasive alien raccoons prey on rare native species during their spawning season from late winter to early summer. We investigated raccoon predation impact by examining the predation presence using DNA metabarcoding and extent of predation on rare native species using stable isotope analysis. We captured raccoons in Hokkaido, Japan from April to August in 2018 and 2019. We analysed raccoon faeces and gastric contents by DNA metabarcoding to detect the rare native Hokkaido salamander and Japanese crayfish. Hokkaido salamanders were detected from gastric contents, but Japanese crayfish were not detected in any samples. Stable isotope analysis of raccoon muscle samples and the Bayesian mixing model were used to estimate each food resource's contribution to the raccoon diet. Animal food resources accounted for 70% of total consumed food. The foraging ratios of amphibians and crustaceans were about 9% and 5%, respectively. Raccoons have been found to use amphibians at a higher rate than previously reported, including a rare endangered species, the Hokkaido salamander. Hokkaido salamander and Japanese crayfish spawn in the spring, and increased predation pressure by raccoons may directly impact populations of these rare native species.
Type: article
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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