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Habitatanvändning av svartmes (Periparus ater) och entita (Poecile palustris)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Habitat use by coal tits (Periparus ater) and marsh tits (Poecile palustris) (English)
Abstract [en]

Competition is common between closely related species, no less between birds. For tits in temperate forests, competition for food and space is usually stronger during winter, as foraging opportunities are few. Many species with an otherwise broad diet, therefore,  start eating the same available food items and thus increase their overlap in the use of food resources. The purpose of this study was to investigate whether coal tits and marsh tits compete with each other. The observations were made in 10 selected locations with varying types of forests. In the study, 20 entrants and 20 blacks were observed for 5 minutes per individual. Every minute the position of the individual was noted in the tree.The results indicate an asymmetrical competition between the species because marsh tits changed its habitat use and were found lower in trees in the presence of coal tits, whereas coal tits did not change its habitat use in the presence of marsh tits. The movement by the Marsh tits can then reduce competition and give both species a better chance of living together.

 

Abstract [sv]

Konkurrens är vanligt mellan närbesläktade arter, inte minst mellan fåglar. Konkurrensen om mat och boplatser blir oftast starkare på vinterhalvåret då det är svårare att hitta mat och många arter som annars föredrar olika sorters föda då börjar äta samma sort. Syftet med denna studie var att undersöka om svartmes och entita konkurrerar med varandra. Observationerna gjordes på 10 utvalda platser med varierande skogstyper. I studien observerades 20 entitor och 20 svartmesar i 5 minuter per individ. Varje minut noterades individens position i trädet. Resultaten visar att det kan förekomma en asymmetrisk konkurrens mellan arterna då entitan flyttade sig nedåt i höjdnivå i närvaro av svartmes, medan svartmes inte ändrade plats i närvaro av entita. Entitans nedflyttning kan då minska konkurrensen och ge båda arter bättre möjlighet till samlevnad.

Place, publisher, year, edition, pages
2017. , p. 11
Keywords [sv]
Konkurrens, niche overlap, födosök, resursdelning
National Category
Ecology
Identifiers
URN: urn:nbn:se:kau:diva-65418OAI: oai:DiVA.org:kau-65418DiVA, id: diva2:1166879
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2017-12-21 Created: 2017-12-16 Last updated: 2017-12-21Bibliographically approved

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CiteExportLink to record
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