Habitatanvändning av svartmes (Periparus ater) och entita (Poecile palustris)
Sammanfattning: 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.
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