Changes in population densities of woodpeckers in an oak forest: a 18-year case study | Zmeny populačnej hustoty ďatľov v dubovom lese: 18-ročná prípadová štúdia
2013
Pavlík, Š., Technical University in Zvolen (Slovak Republic). Faculty of Forestry
The aim of the paper was to analyse changes in population densities of particular woodpecker species in an oak forest near the town Krupina (central Slovakia) during the breeding seasons 1995-2012. The population density was investigated using the combined version of the method of breeding territories mapping. Altogether seven species of woodpeckers were found. Population densities of some species considerably varied during the study years (D. major 0.9-2.9 pairs per 10 ha. D. medius 0.3-1.3 pairs per 10 ha, D. minor 0.0-0.6 pairs per 10 ha). The fluctuations exhibited a quasicyclic pattern and was higher in the case of breeding densities compared with total ones. About 20-33% of pairs attempting in spring to occupy nesting territories failed to nest. Fluctuations could be caused by both food availability in particular years and by weather conditions, especially by climatic extremes, during a breeding season or winter. The population density in the rest of species was relatively stable (D. leucotos 0.2-0.3 pairs per 10 ha, D. martius, P. canus and P. viridis 0.0-0.1 pairs per 10 ha). Obtained results are compared with results from a similar habitat in the Bialowieza primaeval forest (Poland) during 1995-2009.
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