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Tranors förekomst på fält kring Tåkern påverkas av vägar, vatten, byggnader, träd och buskage
Linköping University, Department of Physics, Chemistry and Biology, Biology.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesisAlternative title
Roads, water, buildings, trees and shrub affect the occurrence of the Eurasian crane in fields connected to Lake Tåkern (English)
Abstract [en]

Every year the Eurasian crane travel from northern Africa to northern Europe and Asia. On their migration route they need to rest and often choose places around shallow lakes in agriculture landscapes. During their time in these resting sites the cranes forage in agriculture fields surrounding the lakes, which often cause crop-damage and thereof also financial loses. The last 30 years the population has increased radically, resulting in more extensive crop-damage. This study was set out to gain a better understanding how these migrating cranes choose sites to forage, based on four environment factors: roads, water, buildings, trees and shrub. A study-area in north of Lake Tåkern was selected and during six days in the spring all the cranes in the area were counted and marked on a map. The results showed that the factors affected the occurrence of cranes in the fields. They wanted to be close to shallow water and keep a distance to buildings, roads, trees and shrub. The cranes often spend the night in shallow water and search for food in the area close by to not lose too much energy, which probably was the main reason for the birds to stay close to the water. The distance to buildings and roads suggests that the cranes want to avoid interference from humans and the distance to trees and shrub that they want to have a good awareness of their surroundings. Through this understanding, areas with higher risk to attract groups of cranes can more easily be identified.

Place, publisher, year, edition, pages
2016. , 18 p.
Keyword [en]
Crane, Grus grus, Agriculture, Crop-damage, Lake Tåkern, Pest-bird
National Category
Natural Sciences Biological Sciences Ecology
URN: urn:nbn:se:liu:diva-129776ISRN: LITH-IFM-G-EX--16/3208--SEOAI: diva2:943455
Subject / course
Available from: 2016-06-29 Created: 2016-06-27 Last updated: 2016-06-29Bibliographically approved

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Wohlfarth Hasle, Inger-Marie
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