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1 Polish Journal of Ecology

1 2024

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Possible role of the mass release of Common Pheasant (Phasianus colchicus) in the decline of the Grey Partridge (Perdix perdix) population in Hungary

Molnár Attila, Végvári Zsolt, Gőri Szilvia, Tóthmérész Béla

Polish Journal of Ecology

2024

Vol. 72, nr 4

97--108

Grey partridge (Perdix perdix) is one of the most vulnerable farmland birds facing local extinctions in Europe. Its population decline has been reported in the last decades across the whole continent. Most studies indicate the intensification of agricultural practices and predation as likely causes of this decline. The decrease in the grey partridge population was particularly drastic (98–99%) in Hungary compared to other countries. We assume the mass release of common pheasants (Phasianus colchicus) that began in Hungary years before the decline of the partridge population that resulting high pheasant population density, played a significant role in the decline. We examined the relationship between the release and population size of the pheasant and the declining grey partridge in Hungarian data. We compared this with other negative factors mentioned in the literature. We found that the partridge population shows a stronger correlation with the change in the pheasant population than with any other factors (agro-intensity indicators, predator populations etc.). It suggests a significant role for pheasant maintained by continuous release in the possible causes of the collapse of the partridge population.