Proceedings of the National Institute of Ecology of the Republic of Korea

National Institute of Ecology (국립생태원)
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Food Source Analysis of Rattus norvegicus, a Coinhabitant of Marine Birds in South Korea

  • Kang, Jihyun (Team of Protected Area Research, National Institute of Ecology) ;
  • Cha, Hyoun-Gi (Team of Protected Area Research, National Institute of Ecology) ;
  • Shin, Hyun Chul (Team of Protected Area Research, National Institute of Ecology) ;
  • Lee, Yunkyong (Team of Protected Area Research, National Institute of Ecology) ;
  • No, Doory (Team of Protected Area Research, National Institute of Ecology) ;
  • Kim, Wooyoung (Team of Protected Area Research, National Institute of Ecology) ;
  • Eum, Soon Jae (Team of Protected Area Research, National Institute of Ecology)
  • Received : 2021.09.30
  • Accepted : 2021.11.23
  • Published : 2022.08.01
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Abstract

The Chinese crested tern (Thalasseus bersteini) is one of the most globally endangered species, listed as "Critically Endangered (CE)" on the IUCN Red List, with only approximately 30-49 individuals surviving in the wild. Chinese crested terns were discovered to breed in South Korea for the first time in 2016 while conducting a census on uninhabited islands. The Ministry of Environment has declared the breeding habitat of the Chinese crested terns as "Specified Island" to protect this CE species. However, brown rats (Rattus norvegicus) inhabiting the breeding grounds of the Chinese crested terns and Black-tailed gulls may potentially pose a threat to the breeding of these avian species. Therefore, we conducted a study on the feeding behavior of brown rats involving stable isotope analysis to determine their food sources. Fecal analysis showed that brown rats mainly fed on plants, whereas they scarcely fed on animals, such as insects. In addition, the stable isotope analysis showed that the δ13C values of brown rats, insects, and Indian goosegrasses were approximately -16 to -11‰, whereas the δ13C value of Chinese crested terns that obtained their food from the marine ecosystem was approximately -22 to -18‰. Hence, we conclude that the source of carbon for brown rats on this island is the terrestrial ecosystem. We ruled out the possibility of any direct prey-predator interaction between the brown rat and the Chinese crested tern or Black-tailed gull.

Keywords

Acknowledgement

This work was supported by a grant from the National Institute of Ecology (NIE), funded by the Ministry of Environment (MOE) of the Republic of Korea (NIE-D-2020-24, NIE-D-2021-01).

References

  1. BirdLife International. (2021). Species factsheet: Thalasseus bernsteini. Retrieved Jun 21, 2021 from http://datazone.birdlife.org/species/factsheet/chinese-crested-tern-thalasseusbernsteini.
  2. Chahartaghi, M., Langel, R., Scheu, S., and Ruess, L. (2005). Feeding guilds in Collembola based on nitrogen stable isotope ratios. Soil Biology and Biochemistry, 37, 1718-1725. https://doi.org/10.1016/j.soilbio.2005.02.006
  3. Chan, S., Chen, S., and Yuan, H.W. (2010). International single species action plan for the conservation of the Chinese crested tern (Sterna bernsteini). Bonn: UNEP/CMS Secretariat.
  4. Chen, S., Chang, S., Liu, Y., Chan, S., Fan, Z., Chen, C., et al. (2009). A small population and severe threats: status of the Critically Endangered Chinese crested tern Sterna bernsteini. Oryx, 43, 209-212. https://doi.org/10.1017/S0030605308001142
  5. Craine, J.M., Brookshire, E.N.J., Cramer, M.D., Hasselquist, N.J., Koba, K., Marin-Spiotta, E., et al. (2015). Ecological interpretations of nitrogen isotope ratios of terrestrial Plants and Soils. Plant and Soil, 396, 1-26. https://doi.org/10.1007/s11104-015-2542-1
  6. Cultural Heritage Administration. (2004). Habitat Monitoring for National Monument Bird. Daejeon: Cultural Heritage Administration.
  7. Hong, S., Cowan, P., Do, Y., Gim, J.S., and Joo, G.J. (2016). Seasonal feeding habits of coypu (Myocastor coypus) in South Korea. Hystrix, the Italian Journal of Mammalogy, 27, 123-128.
  8. Howald, G., Donlan, C.J., Galvan, J.P., Russell, J.C., Parkes, J., Samaniego, A., et al. (2007). Invasive rodent eradication on islands. Conservation Biology, 21, 1258-1268. https://doi.org/10.1111/j.1523-1739.2007.00755.x
  9. Jo, Y.S., Baccus, J.T., Koprowski, J.L., and Ji, Y.H. (2018). Mammals of Korea. Incheon: National Institute of Biological Resources.
  10. Jones, H.P., Tershy, B.R., Zavaleta, E.S., Croll, D.A., Keitt, B.S., Finkelstein, M.E., et al. (2008). Severity of the effects of invasive rats on seabirds: a global review. Conservation Biology, 22, 16-26. https://doi.org/10.1111/j.1523-1739.2007.00859.x
  11. Kang, J.H., Kang, T.H., Yoo, S.H., Cho, H.J., Lee, S.W., and Kim, I.K. (2008). Study on the breeding status of the natural monument islet (Chilbaldo, Sasudo, Nando, Hongdo). Korean Journal of Ornithology, 15, 169-175.
  12. Lee, K.G., and Yoo, J.C. (2002). Breeding population of Streaked Shearwaters (Calonectris leucomelas) and the effect of Norway rat (Rattus norvegicus) predation on Sasudo island. Journal of the Yamashina Institute for Ornithology, 33, 142-147. https://doi.org/10.3312/jyio1952.33.142
  13. Major, H.L., Jones, I.L., Charette, M.R., and Diamond, A.W. (2007). Variations in the diet of introduced Norway rats (Rattus norvegicus) inferred using stable isotope analysis. Journal of Zoology, 271, 463-468. https://doi.org/10.1111/j.1469-7998.2006.00230.x
  14. Ministry of Environment., and National Institute of Ecology. (2019). The 3rd Ecological Survey of Thalasseus bernsteini. Seocheon: National Institute of Ecology.
  15. Ministry of Environment., and National Institute of Ecology. (2020). The 4th Ecological Survey of Thalasseus bernsteini. Seocheon: National Institute of Ecology.
  16. Moller, A.P. (1983). Damage by rats Rattus norvegicus to breeding birds on Danish islands. Biological Conservation, 25, 5-18. https://doi.org/10.1016/0006-3207(83)90027-7
  17. Nam, K.B., Lee, K.G., Hwang, J.W., and Yoo, J.C. (2014). Variation in breeding burrows of Streaked Shearwaters breeding in Sasu island, and predation rates by Norway rats. Ocean and Polar Research, 36, 49-57. https://doi.org/10.4217/OPR.2014.36.1.049
  18. Oh, H.S., Chang, M.H., and Kim, T.W. (2008). A study on the management of Streaked Shearwaters (Calonectris leucomelas) population on Sausdo Island. Korean Journal of Ornithology, 15, 107-116.
  19. Pulliam, H.R. (1974). On the theory of optimal diets. The American Naturalist, 108, 59-74. https://doi.org/10.1086/282885
  20. Russell, J.C., and Le Corre, M. (2009). Introduced mammal impacts on seabirds in the Iles Eparses, Western Indian Ocean. Marine Ornithology, 37, 121-128.
  21. Song, S.K., Lee, S.W., Lee, Y.K., Lee, S.Y., Kim, C.H., Choi, S.S., et al. (2017). First report and breeding record of the Chinese Crested Tern Thalasseus bernsteini on the Korean peninsula. Journal of Asia-Pacific Biodiversity, 10, 250-253. https://doi.org/10.1016/j.japb.2017.04.005
  22. Tabak, M.A., Anderson, O.R.J., Robb, G., Poncet, S., Passfield, K., Martinez, M.G., et al. (2016). Comparative isotopic natural history of two native passerines (Troglodytes cobbi and Cinclodes antarcticus) and the invasive rats (Rattus norvegicus) that extirpate them. Austral Ecology, 41, 622-632. https://doi.org/10.1111/aec.12351
  23. Towns, D.R., Atkinson, I.A.E., and Daugherty, C.H. (2006). Have the harmful effects of introduced rats on islands been exaggerated? Biological Invasions, 8, 863-891. https://doi.org/10.1007/s10530-005-0421-z
  24. Xu, Y., He, J., Cheng, W., Xing, X., and Li, L. (2010). Natural 15N abundance in soils and plants in relation to N cycling in a rangeland in Inner Mongolia. Journal of Plant Ecology, 3, 201-207. https://doi.org/10.1093/jpe/rtq023
  25. Yan, G., Han, S., Zhou, M., Sun, W., Huang, B., Wang, H., et al. (2020). Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction: interpretation of C and N dynamics. Forest Ecosystems, 7, 49. https://doi.org/10.1186/s40663-020-00257-w