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Conservation values of abandoned farmland for birds: a functional group approach

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Abstract

Abandoned farmland area has been expanding globally for decades. Studies showed that conservation value of abandoned farmland has differed among studies and regions, and thus is difficult to predict. However, predicting the effects of farmland abandonment on biodiversity remains vital to the development of appropriate conservation strategies. Here, we compared the species-, community-, and functional group-level habitat suitability of abandoned farmland for birds by comparison with active farmland (pasture, cropland, and rice paddy) and natural wetland on Hokkaido, Japan, over a study area of 400 km × 500 km. Results differed markedly between functional groups. The abundance and species richness of grassland species in abandoned farmland were higher than that in active farmland, and comparable to that in wetland. In contrast, abundance and richness of bare-ground species was highest in active farmland. For most species, interactive effects between climate variables and abandoned farmland were not significant, suggesting a consistent habitat suitability of abandoned farmland irrespective of varied climatic conditions. Our results suggest that abandoned farmland plays an important role as habitat for grassland and forest species at large scales; farmland abandonment provides a valuable alternative habitat for species whose primary habitats have been lost to agricultural expansion. Especially, abandoned farmland in warmer areas in Hokkaido would represent a potential mitigation to the negative effects of wetland loss. A functional group approach synthesizes varied species-level responses and allows for a comprehensive understanding of the habitat suitability of abandoned farmland. Adopting this approach will contribute to establishing appropriate conservation strategies.

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Source: DIVA-GIS Free spatial data

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Data Availability

The datasets and code generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank the farmers and citizens who own lands of sampling plots, municipal office staff of study regions, and staff of the land improvement associations for their kindness and cooperation with our field survey. Thoughtful comments by four anonymous reviewers helped to improve the manuscript. We also thank the members of the Ecosystem Management Group of Hokkaido University for their helpful discussions. Fieldwork was supported by the Environmental Research and Technology Development Fund (4-1504 and 4-1805) of the Ministry of the Environment of Japan. MK was supported by JSPS KAKENHI grants: number JP19J20957.

Funding

Fieldwork was supported by the Environmental Research and Technology Development Fund (4–1504 and 4–1805) of the Ministry of the Environment of Japan. MK was supported by JSPS KAKENHI Grants: Number JP19J20957.

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Correspondence to Munehiro Kitazawa.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Communicated by Hossein Kazemi.

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Kitazawa, M., Yamaura, Y., Kawamura, K. et al. Conservation values of abandoned farmland for birds: a functional group approach. Biodivers Conserv 30, 2017–2032 (2021). https://doi.org/10.1007/s10531-021-02178-8

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  • DOI: https://doi.org/10.1007/s10531-021-02178-8

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