https://orcid.org/0000-0002-0915-1636Figure 1. The mean brood size in Grey Partridges in the three regions of Poland in the years 1987–2013 (west: r = –0.6170, df = 25, P < 0.001, y = –0.137x + 281.6; centre: r = –0.6706, df = 25, P < 0.001, y = –0.099x + 206.1; east: r = –0.6098, df = 25, P < 0.001, y = –0.099x + 206.3).
Figure 2. The survival rate of Grey Partridge chicks in Poland in the years 1987–2013.
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