"bewicksswan" - 1 õppematerjal

Tundra swans

● Host several parasites – heartworms, guinea worms, gizzard worms, avian malaria ● Have mutualistic relationship with sago pondweed - penikeel ● Use pondweed as a food source during migration; disperse pondweed, causing its population to expend  References ● http://www.eestiloodus.ee/artikkel1838_1806.html(KIK 2007:1) ● https://www.rspb.org.uk/discoverandenjoynature/disc overandlearn/birdguide/name/b/bewicksswan/ (rspb 2015:1) ● https://en.wikipedia.org/wiki/Tundra_swan (Wikipedia 2016:1) ● https://en.wikipedia.org/wiki/Whooper_swan (Wikipedia 2016:1) ● https://en.wikipedia.org/wiki/Mute_swan (Wikipedia 2016:1) ● http://animaldiversity.org/accounts/Cygnus_columbianu