Sterna, bind 13 nr 1 (PDF-fil) - Museum Stavanger
Sterna, bind 13 nr 1 (PDF-fil) - Museum Stavanger
Sterna, bind 13 nr 1 (PDF-fil) - Museum Stavanger
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Valanne, K. 1966: Iiicubation behaviour and temperature of capercaillie (Terrao<br />
urogallus) and willow grouse (Lagopus lagopus). (Finsk med engelsk summary.)<br />
- Suo<strong>nr</strong>en Riisfa 19: 3041.<br />
Westcrskov, K. 1956: Age tletermination and dating cvents in the willow plarmigan.<br />
- J. Wildl. Mgtnf. 20: 274-279.<br />
Wildhagen, Aa. 1952: O<strong>nr</strong> i.ekslingetre i besfonden or smignagere i Norge 1871-1949.<br />
- Oslo (Stat. viltunders.), 192 pp.<br />
Witherby, H. F.. Jourdain, F. C. R., Ticehurst, N. F. & Tucker, B. W. 1949: The<br />
Hattdbook of Brilisli Birds I-V. - London.<br />
SUMMARY: REPRODUCTION AMONG TETRAONIDAE IN SETESDALEN,<br />
SOUTH NORWAY. IN 1929-1934<br />
Data are presented on rcproduction of Willow Grouse, Black Grouse and<br />
Capcrcaillie, found by field studies by Per HØst and Yngvar Hagen. For the years<br />
1929 and 1930 wc build only on thc preliminary rcports (Hpst 1930 a & b).<br />
Egg laying dates are calculated from hatching dates using lengths of incubation<br />
pcriods of 21, 24 and 26 days, and egg laying intervals of 1, 1% and 1% dnys, for<br />
Willow Grouse, Black Grouse and Capercaillie respcctitPely.<br />
Start of egg laying, numhcr of eggs and egg loss are prcsentcd in Tables 1-4.<br />
We have no data for 1931, however, the year when micro-rodent numbcrs crashed.<br />
Both Willow Grouse and Black Grouse had earliest egg laying and biggest clutches<br />
in 1934. Egg laying was delnyed in 1932, a year with a late thaw.<br />
it is stressed that the data for the increasing weight of Willow Grouse chicks from<br />
June to September presented by Hagen (1937). do not represent individual growth
Change language