Wyniki wyszukiwania

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The dynamics of changes in partridge population (Perdix perdix L.) in the hunting regions of the central-eastern Poland in the years 1998-2007

100%

Bombik E., Wysokinska A., Gorski K., Kondracki S.

Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego

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2009

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tom 05

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nr 4

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Gender and age structure as well as body weight of partridge (Perdix perdix L.) during periods of high and low population density in the Lublin Upland

100%

Flis M., Panek M.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2017

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tom 56[1]

Gender and age structure as well as body weight of partridge (Perdix perdix L.) during periods of high and low population density in the Lublin Upland. Studies upon structure of gender and age as well as body weight of partridges were carried out in the Lublin Upland in 1988 and 2015, different in relation to the levels of these animals population density. These features were evaluated in 104 individuals culled in early October. Nearly 4-fold decrease in the population density of this species was recorded between the compared periods. Over 80-fold decrease in the hunting acquisition of partridge occurred the same period. A decrease in the share of females in the population after the breeding period was also found, which probably resulted from an increase in this gender mortality during the breeding season. Proportions of the number of juveniles to adult animals (2.4 and 1.7), and to adult males (4.0 and 1.7) in two subsequent study years, i.e. indicators of the young partridges production, did not differ significantly, but it could be mainly due to a small sample in the latter year. The gender structure of juvenile partridges was 0.94 male per female in 1988 and 0.71 male per female in 2015, which did not significantly differ between periods (χ2 = 0.178). Among adult individuals, 1.5 male per female were recorded in 1988, while only males were reported in 2015. Body weight of young partridges decreased between the years of research by 22.5 gram, i.e. 6%, while adult animals by 12.5 gram, which indicates the decrease in bird size, and thus the individual condition, presumably due to limited food resources. Differences in body weight between periods were statistically significant only at young animals. Such situation can cause enhanced mortality of young partridges in autumn and winter, therefore worsen the existing regress in this species population. The results confirmed that the previous assessment of the causes of the decline in partridges population in Poland, showing an increase in losses during the breeding season, as the main demographic mechanism, were valid also for the second decade of the twenty-first century. It follows that improving the environmental conditions during the breeding season, besides reducing the number of predators, should be an essential part of the partridge active protection programs.

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Vegetation structure at the breeding sites of the partridge [Perdix perdix L.] in Central Europe and its possible importance for population density

80%

Wubbenhorst D., Leuschner C.

Polish Journal of Ecology

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2006

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tom 54

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nr 1

This paper analyses the abundance of breeding pairs and the location of nesting sites of partridges as related to vegetation structure in the nest surroundings in two areas with very different partridge densities and arable landscape patterns (Central Germany and Eastern Poland). Study objective was to identify underlying causes of the more than 100 fold difference in population density of this species in these two areas of Central Europe. Our results suggests that the very limited availability of appropriate nesting habitats with an open canopy structure and low leaf area index is one of the key factors being responsible for the very low recent population density, and the past rapid decline, of partridge in the modern agricultural landscape of western Central Europe.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Animal Science

1 Polish Journal of Ecology

1 Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego

1 Bombik E.

1 Flis M.

1 Gorski K.

1 Kondracki S.

1 Leuschner C.

1 Panek M.

1 Wubbenhorst D.

1 Wysokinska A.

1 2017

1 2009

1 2006

The dynamics of changes in partridge population (Perdix perdix L.) in the hunting regions of the central-eastern Poland in the years 1998-2007

Gender and age structure as well as body weight of partridge (Perdix perdix L.) during periods of high and low population density in the Lublin Upland

Vegetation structure at the breeding sites of the partridge [Perdix perdix L.] in Central Europe and its possible importance for population density