Promjena veličine populacije kosa (Turdus merula Linnaeus, 1758) u gradu Zagrebu u odnosu na strukturu staništa i brojnost sive vrane (Corvus corone cornix Linnaeus, 1758)

master's thesis

• Title (english): Change in population size of the european blackbird (Turdus merula Linnaeus, 1758) in Zagreb in relation to habitat structure and abundance of the hooded crow (Corvus corone cornix Linnaeus, 1758)
• Author: Ivana Kovačić
• Mentor: Jelena Kralj (mentor)
• Committee member: Jelena Kralj (predsjednik povjerenstva)
• Committee member: Sven Jelaska (član povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Committee member: Marin Ježić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2020-12-10, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Kos (Turdus merula Linnaeus, 1758) jedna je od najčešćih gnjezdarica grada Zagreba. Cilj ovog istraživanja bio je utvrditi postoji li promjena u veličini populacije kosa u gradu Zagrebu u posljednjih desetak godina u odnosu na strukturu staništa i kao posljedica odnosa plijen-predator između kosa i sive vrane (Corvus corone cornix Linnaeus, 1758). Prebrojani su gnijezdeći parovi kosa na 12 kvadrata veličine 1 km2, te su dobiveni podaci uspoređeni s brojnošću kosa na istim kvadratima zabilježenim prije desetak godina, promjenom broja parova sive vrane te promjenom u strukturi staništa. Zabilježen je porast gnijezdećih parova kosa te je utvrđeno kako promjene u populaciji sive vrane ne utječu na populaciju kosa. Struktura staništa također se nije značajno promjenila, stoga niti ona nema utjecaj na promjenu veličine populacije kosa. Zaključeno je kako kapacitet staništa za kosa nije popunjen. Za detaljnije razumjevanje promjena u veličini populacije kosa u gradu Zagrebu bilo bi potrebno pratiti godišnje fluktuacije u veličini populacije te ih korelirati s nekim od čimbenika koji bi mogli utjecati na takve promjene, kao što su temperatura i dostupnost hrane.

Abstract (english)

Blackbird (Turdus merula Linnaeus, 1758) is one of the most common breeding birds of the city of Zagreb. The aim of this research was to quantify the change in population size of blackbird in Zagreb in the last ten years, in relation to the habitat structure and as a result of the prey-predator relationship between blackbird and hooded crow (Corvus corone cornix Linnaeus, 1758). Breeding pairs of blackbird were counted on 12 squares of 1 km2 area, and collected data was compared to number of blackbirds counted on the same sqares ten years ago, change in population size of hooded crow, and with change in habitat structure. The increase of breeding pairs of blackbird was found, but it was not correlated with change in population size of hooded crow. Habitat structure hasn’t changed significantly in the last ten years, therefore it is not correlated with change in blackbird population size. It is concluded that the carrying capacity of habitat for the blackbird hasn’t been reached yet. To better understand the blackbird population changes in the city of Zagreb, yearly fluctuation would have to be monitored and compared to some of the factors potencially influencing these fluctuations, such as temperature and food availability.

• Keywords: predacija gnijezda; stanište; urbanizacija
• Keywords (english): nest predation; habitat; urbanisation
• Language: croatian
• URN:NBN: urn:nbn:hr:217:309457
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-12-14 11:32:14