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Land-cover changes and distribution of wetland species in small valley habitats that developed in a Late Pleistocene middle terrace region

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Abstract

Small valley topology on terraced uplands is a unique groundwater-dependent ecosystem in East Asia. Traditionally, this characteristic valley topology has been used for rice paddies because of the sustained availability of spring water. It also provided a unique habitat for wildlife with moderate agricultural disturbance. Due to recent changes in the land use of terraced terrain, these semi-natural wetlands are disappearing rapidly without an accurate assessment of its conservation value. We examined the distribution of small valley habitats in the Shimousa Upland in northern Chiba Prefecture, Japan, and analyzed temporal changes in land cover from the 1970s to 2010s. We also compared the habitat affiliation of endangered wetland species in the small valley topology and the temporal change of their habitat suitability. We found that the relative percentage of urban area has increased rapidly in upland (from 18.6 to 37.9%) and valley (from 13.1 to 28.6%) areas. The abandonment of rice paddies in the valleys has also increased. Of the endangered wetland species, Geothelphusa dehaani, Lefua echigonia, and Lethenteron reissneri were more common in small valley wetland habitats. However, remained habitat for these species has been decreased due to the on-going urbanization in a terrace area.

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Acknowledgements

We sincerely thank Chiba Biodiversity Center for providing the occurrence information of endangered species and permission to use the dataset. Ji Yoon Kim is a JSPS (Japan Society for the Promotion of Science) International Research Fellow (ID No: P17387). JSPS is a nonprofit organization. This work was supported by JSPS KAKENHI Grant Number 17F17387 and the Environment Research and Technology Development Fund (4-1705) of Environmental Restoration and Conservation Agency.

Funding

Japan Society for the Promotion of Science—JSPS postdoctoral fellowship (Grant Number P17387). Japan Society for the Promotion of Science—JSPS KAKENHI (Grant Number 17F17387). Environmental Restoration and Conservation Agency—Environment Research and Technology Development Fund (Grant Number 4-1705).

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Correspondence to Ji Yoon Kim.

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Kim, J.Y., Hirano, Y., Kato, H. et al. Land-cover changes and distribution of wetland species in small valley habitats that developed in a Late Pleistocene middle terrace region. Wetlands Ecol Manage 28, 217–228 (2020). https://doi.org/10.1007/s11273-020-09707-2

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  • DOI: https://doi.org/10.1007/s11273-020-09707-2

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