多摩丘陵の落葉樹林における鳥類群集の 25 年間の比較

概要

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Bird communities in a deciduous forest in Tama Hill, a suburb of Tokyo, were compared between 1968/69 and 1994. There was no obvious difference between the two periods in number of bird species recorded in all observations (S^+). However, the number of species recorded in the census area (S), the diversity (H') and the total number of birds were higher in 1994 than in 1968/69. Some resident species such as Siberian Meadow Bunting (Emberiza cioides), Bull-headed Shrike (Lanius bucephalus), and Tree Sparrow (Passer montanus) decreased in number, and 9 seasonal species disappeared altogether. Other resident species such as Brown-eared Bulbul (Hypsipetes amaurotis), Great Tit (Parus major), and Japanese Pygmy Woodpecker (Dendrocopos kizuki) increased in number, and 14 new seasonal species appeared. The dominant species changed drastically from Siberian Meadow Bunting and Rustic Bunting (Emberiza rustica) in 1968/69 to Great Tit and Brown-eared Bulbul in 1994. These changes were probably related to environmental changes such as fragmentation of habitat, and growth and succession of forests in and surrounding the study area.
野生生物保護学会の論文