Landscape and local scale effects on the orthopteran assemblages in the paddy agroecosystems on the Sado Island, Japan with implications for the habitat management for the crested ibis.

DOI Web Site 2 Citations 48 References
  • YOSHIO Masanobu
    Laboratory of Biodiversity Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • KATO Noriyuki
    Laboratory of Biodiversity Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • MIYASHIT Tadashi
    Laboratory of Biodiversity Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • 水田環境におけるバッタ目昆虫の分布と個体数を決定する環境要因～佐渡島におけるトキの採餌環境の管理にむけて
  • スイデン カンキョウ ニ オケル バッタモク コンチュウ ノ ブンプ ト コタイスウ オ ケッテイ スル カンキョウ ヨウイン サドガシマ ニ オケル トキ ノ サイジ カンキョウ ノ カンリ ニ ムケテ

Search this article

Abstract

Reintroduction of endangered or extinct species is becoming major restration activities for conservation of biodiversity and ecosystems. The crested ibis (Nipponia nippon), once extinct in Japan, was released into natural environment on Sado Island, Japan, in September 2008. Since orthopteran insects are thought to be one of the major prey for the crested ibis, it is important to clarify the factors influencing the distribution and abundance of orthopterans. We investigated abundance of five orthopterans (Oxya yezoensis, Atractomorpha lata, Conocephalus maculatus, Ruspolia lineosa and Teleogryllus emma) on Sado Island in September 2008. Local-scale environmental factors including grass-height and land-use type (arable or fallow) were recorded in the field. Landscape-scale factors such as proportion of paddy fields and total length of forest edge in the buffer circle surrounding the paddy fields were extracted using GIS. Various sizes of buffer circles were generated around each paddy to identify appropriate spatial scales. Model selection was performed with a generalized linear model using the AIC to find the best model for accounting for the abundance or the probability of occurrence of these species. Landscape factors were important for all species except A. lata. The proportion of paddy fields had a significant positive effect on the abundance of O. yezoensis which was conspicuously dominant. The interaction between the proportion of paddy fields and the length of forest edge had a significant effect on C. maculatus and T. emma. At the local scale, intermediate grass-height enhanced the abundance of O. yezoensis and C. maculatus and the occurrence of R. lineosa, and fallow fields were the suitable habitats for T. emma. Our results suggest that maintaining lowland paddy fields containing fallows and reducing the frequency of mowing surrounding paddy fields are effective for increasing the orthopteran abundance and diversity in the paddy-dominated ecosystems.

Journal

Citations (2)*help

See more

References(48)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top