Use of sequential aerial photography and LiDAR for mapping Scots Pine (Pinus sylvestris) encroachment and change detection in bird habitats from 1950 to 2007 in Nigula Bog (Estonia)

摘要

The concern that possible linkages exist between changes in mire habitats and long-term dynamics of populations of several mire bird species have raised many questions about the current conservation status of valuable raised bog habitats in Estonia. The results of long-term bird census studies in Nigula bog indicate a negative trend in the number of protected species. It is suggested that an explanation for these trends is needed for the evaluation and improvement in management practice of conservation area. The study presented suggests that the long-term trends in bird populations correspond with changes in habitat type and extent. By combining recent bird censuses with remotely sensed data, we have modeled present and past bird habitats of Nigula bog.