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The purpose of this study is to determine the level of costs for individual commodity farms in Poland, indicate the importance of particular types of costs for shaping size changes in this economic category by type of farms and determine the relationship between costs and value of total production. The survey covered individual commodity farms in Poland. The basic source of data were statistics collected...
The data on the distribution and number of the capercaillie Tetrao urogallus in Poland for the period from the end of the 20th century up to 2017−2018 is presented. The capercaillie is a sedentary forest grouse living in old mountain forests and within the boreal zone. Since more than a century, the decrease in the numbers of the species has been observed, interlinked with the extinction of isolated...
We assessed the assemblages of birds inhabiting pine-dominated managed forest, aged between 1–5 years and above 140 years. Birds were counted on study plots representing eight different phases to the forest's development, with nesting, foraging and migratory guild categories recognised. Numbers of bird species and population densities, both increased markedly with stand age (respectively r = 0.988...
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