V. Johansson, T. Snäll, P. Johansson and T. Ranius 2010: Detection probability and abundance estimation of epiphytic lichens based on height-limited surveys. - Journal of Vegetation Science21(2): 332-341. [RLL List # 219 / Rec.# 31949] Keywords: EPIPHYTES/ HEIGHT-LIMITED SURVEYS/ VERTICAL DISTRIBUTION/ INDICATOR SPECIES/ TREE AGE/ OAK FORESTS/ SWEDEN
Abstract: [Study on Quercus robur in SE Sweden. "Models predicting total abundance based on data from the lowest 2 m and diameter explained >80% of the deviance for all except one species. The vertical distribution of the study species was explained by bark fissure depth, area and cover of macrolichens. For crustose lichens associated with old oaks, surveying only the lowest 2 m of the trunk yields reliable occurrence data and fairly good estimates of total abundance. However, before interpreting data from the lowest 2 m, knowledge of species vertical distribution, and how the distribution changes with tree age is essential."]