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. / 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.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kau-65418 |
| Date | January 2017 |
| Creators | Radegård, Madeleine |
| Publisher | Karlstads universitet, Institutionen för miljö- och livsvetenskaper |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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