Journal Article10.1007/S11355-014-0263-X
Modernization of drainage systems decreases gray-faced buzzard occurrence by reducing frog densities in paddy-dominated landscapes
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TL;DR: In this article, the gray-faced buzzard (Butastur indicus), a top predator that inhabits agricultural landscapes in East Asia, was evaluated by measuring reductions in paddy-dwelling frogs, a major prey for buzzards that are common in rice fields.
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Abstract: Modernization of drainage systems is suspected of causing a deterioration in the biodiversity of paddy-dominated landscapes that are substitutes for natural wetlands. Here, we focused on the gray-faced buzzard (Butastur indicus), a top predator that inhabits agricultural landscapes in East Asia. We evaluated the impacts of drainage system modernization on buzzards by measuring reductions in paddy-dwelling frogs, a major prey for buzzards that are common in rice fields. Field surveys were conducted in yatsu valleys (“yatsu” refers to small, narrow valleys in which rice cultivation often dominates the valley bottom) in Shimane prefecture, western Japan. We found that the distribution of buzzards was positively correlated with the densities of black-spotted pond frogs (Pelophylax nigromaculatus) and forest green tree frogs (Rhacophorus arboreus), although the relationship between buzzards and pond frogs was stronger. In addition, pond frog density was negatively correlated with modern drainage systems, whereas tree frog density did not show such a pattern. Therefore, modern drainage systems may reduce the buzzard population indirectly by reducing pond frog densities.
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Citations
The significance of region-specific habitat models as revealed by habitat shifts of grey-faced buzzard in response to different agricultural schedules.
TL;DR: In this paper, the authors focused on grey-faced buzzards in agricultural landscapes of Japan, which show geographically different habitat selection, and found that buzzards preferred paddy-forest landscapes in the early transplanting regions, but grassland-forest landscape in the late transplanting region.
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TL;DR: Two Rana species, R. ornativentris and R. japonica, were evaluated using a model incorporating spatial autocorrelation to explain the presence/absence of two species and the spatial model had a higher discriminative ability than the non-spatial model.
Effects of Landscape Heterogeneity at Multiple Spatial Scales on Paddy field-breeding Frogs in a Large Alluvial Plain in Japan
TL;DR: In the Kanto Plain, the largest alluvial plain in Japan, an extensive frog survey was conducted to ascertain multiple spatial scale heterogeneities of frog abundance in relation to topography, climate, land use pattern, and features of paddy fields, revealing differences in distribution patterns, spatial heterogeneity of abundance, and environmental preference of these frogs.
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