Are both agricultural intensification and farmland abandonment threats to biodiversity? A test with bird communities in paddy-dominated landscapes
Agriculture, Ecosystems & Environment
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Katayama, N., Osawa, T., Amano, T., & Kusumoto, Y. (2015). Are both agricultural intensification and farmland abandonment threats to biodiversity? A test with bird communities in paddy-dominated landscapes. Agriculture, Ecosystems & Environment, 214 21-30. https://doi.org/10.1016/j.agee.2015.08.014
Land-use changes, including agricultural intensification and farmland abandonment, influence biodiversity in agricultural landscapes. However, few studies have focused on how the two major land-use changes affect different types of species at landscape scales. This study examined the relationships between the richness and abundance of five bird groups (agricultural wetland species, agricultural land species, grassland species, edge species, and woodland species) as well as the total species richness and abundance, and intensification or abandonment in 28 square, 100-ha grid cells in paddy-dominated landscapes in the Tone River basin of central Japan. Rice-field intensification and abandonment were not completely segregated spatially: intensification occurred in both plain and hilly areas surrounded by forests, while abandonment tended to occur in hilly areas. The effects of intensification and abandonment differed among species groups and between seasons. The richness or abundance of agricultural wetland species in summer were negatively associated with both intensification and abandonment. While the abundance of agricultural land species in winter and grassland species in both seasons were positively associated with intensification and abandonment, respectively. The total species richness and abundance did not show clear association with intensification and abandonment due to a variety of responses of the five bird groups. Based on prefectural Red Data Books, agricultural wetland species, followed by grassland species, were more threatened than other three groups in both summer and winter. This study found that (1) the diversity of habitats (including consolidated and abandoned farmlands) provides buffer areas for the different bird groups on different times of the year and (2) agricultural wetland species that use flooded rice fields in summer, such as egrets and shorebirds, are particularly threatened by both intensification and abandonment.
Agricultural landscapes, Bird diversity, Habitat consolidation, Old fields, Waterbirds
We thank Yoshinori Tokuoka, Susumu Yamada, Eun-Young Kim, and Shori Yamamoto for providing land-use data. We also appreciate two anonymous reviewers for their constructive comments and suggestions. This study was conducted as part of the research project “Developing management techniques for agricultural and aquatic ecosystems in river basins in pursuit of coexistence with nature,” funded by the Agriculture, Forestry and Fisheries Research Council of Japan. N.K. and T.O. were also financially supported by JSPS (Japan Society for the Promotion of Science) KAKENHI Grant Numbers 25830154 and 24710038, respectively. T.A. was supported by the European Commission’s Marie Curie International Incoming Fellowship Programme (PIIFGA-2011-303221).
European Commission (303221)
External DOI: https://doi.org/10.1016/j.agee.2015.08.014
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253188
Attribution-NonCommercial-NoDerivs 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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