Environmental factors affecting the composition and diversity of the avian community in igune, a traditional agricultural landscape in northern Japan

Table 1 Environmental factors selected in this study

Factor	Abbreviation	Attribute
Number of igune within each site	Density	Numerical
Average area of igune woodlots within each site	Mean area	Numerical
Distance from nearest large forest habitat to the center of each site	Distance	Numerical
Total area of igune woodlots within each site	Total area	Numerical
Total area of igune woodlots observed directly during bird surveys	100 m area	Numerical
Percentage of igune which included the broadleaf more than half in canopy area	Broadleaf	Numerical
Percentage of igune which was pruned bushes	Clearing	Numerical

ISSN: 2288-1220