Numbers of mute swans and Whooper Swans in Sweden, 1967-2000
Mute Swans (Cygnus olor) and Whooper Swans (Cygnus cygnus) in Sweden have been monitored as part of the International Waterbird Census (IWC) since 1967. For the Whooper Swan, midwinter indices show fluctuations around a slowly increasing trend. Country-wide surveys in 1971-72, 1988-89, 1995 and 2000...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Waterbird Society
2002
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Online Access: | https://lup.lub.lu.se/record/320508 |