Changes in the migration phenology of Reed and Marsh Warbler (Acrocephalus scirpaceus, A. palustris)
Abstract
The impact of climate change on different bird species may be different. It is not surprising at species having different breeding grounds, habitat preference or migration strategy, but there might be big differences between very similar, sibling species as well.
During the last 24 years the median time of spring migration shifted 7.5 days earlier in the case of Reed Warbler while it shifted 8 days later in the case of Marsh Warbler. The median of post-breeding migration time shifted 8.5 days and 6 days later in the case of adult and juvenile Reed Warblers, and 9 days later in the case of juvenile Marsh Warblers. Post-breeding migration time of adult Marsh Warblers has not changed significantly. Climate change affected the timing of spring migration of the two species adversely. This might be due to the combined effect of the differences in the migration phenologies and habitat preferences. The breeding season of Reed Warblers became longer therefore an increase in the number of second clutches might be expected. However, the ratio of juveniles has not changed.
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