Species and habitats - Trisopterus minutus - All ages - Recurrence - IBTS Q3 (1991-2010)

Species habitat occupation, observed during the third quarter IBTS from 1991 to 2010, has been expressed as rare, occasional, frequent, recurrent depending on density levels and variability over time.1991年至2010年第三季度IBTS调查期间观测得到的物种栖息地占据状况，依据种群密度水平与随时间推移的波动特征，被划分为罕见、偶见、常见、频发四个等级。