Семенов-Тян-Шанский О.И. Экология тетеревиных птиц. Москва, 1959.

75. Food composition of marten in Petshora-Ylytsh Reserve. For explications see fig. 74 (cedar nuts are indicated together with berries). 76. Value of eggs in martens winter diet, in comparison with embryonic mortality in Capercaillie (above) and accessibility of voles (below). Solid line — Petshora-Ylytsh Reserve, dash line — Lapland Reserve. 77. Plan of martens attack on two Capercaillies, hidden in snow burrows. 78. Figures of Capercaillies (columns above) and Willow Grouse (columns below) destroyed by predators, in connection with values of their populations (solid line). 79. Alternations in Capercaillie testiculae weight in course of year (grams). 80. Alternations in Willow Grouse testiculae weight in course of year (grams). 81. Switch box of a nesting recorder (In section). 82. Thermograph with nest-recording device; on the right — the switch box with double wire and a dry pile. 83. Actograph in work by the Capercaillie nest. 84. Brooding regime of a Capercaillie female in Lapland Reserve. Explications: articulate line on high level indicates the fowl being on nest, on low level — fowl being absent; solid line (under the articulate lin e )— air temperature below zero;, dash line — air temperature from 0° up to 5°C; asterisk — fowl driven away. 85. Brooding regime of Capercaillie female in Petshora-Ylytsh Reserve. For explications — see fig. 84. 86 . Capercaillie nest in time of hatching the chickens. 87. Blackgame nest in Lapland Reserve. 88 . Brooding regime of Blackgame female in Petshora-Ylytsh Reserve. For explications — see fig. 84. 89. Brooding regime of Hazel Grouse female in Petshora-Ylytsh Reserve. For explications — see fig. 84. 90. Willow Grouse nest in Lapland Reserve. 91. Brooding regime of Willow Grouse female in Lapland Reserve, in 1950 (above) and in 1951 (below). For explications — see fig. 84. 92. Capercaillie and Blackgame fluctuations in numbers in taiga- zone. Explications: line with rings — Lapland Reserve, number of specimens for 10-hour trip; line with crosses — Lapland Reserve, census figures for 1 sq. km; dot line — Finnish Lapland, bag in thousands; dash line — Petshora-Ylytsh Reserve, number of specimens for 25 km trip; dash line with crosses — census figures for 1 sq. km. 93. Hazel Grouse and Willow Grouse fluctuations in numbers in taiga zone. For explications — see fig. 92. 94. Weather of breeding period and age ratios in Capercaillie population in Lapland Reserve. Explications: columns above — precipitation sums in June, dash line — average air temperatures of 308