Utjecaj vremenskih uvjeta na dinamiku hranjenja mladunaca crnoglave strnadice (Emberiza melanocephala Scopoli, 1769)

master's thesis

• Title (english): Impact of weather on nestling provisioning patterns in the Black-headed Bunting (Emberiza melanocephala Scopoli, 1769)
• Author: Ana Petrović
• Mentor: Sanja Barišić (mentor)
• Mentor: Duje Lisičić (sumentor)
• Committee member: Duje Lisičić (predsjednik povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Committee member: Antun Alegro (član povjerenstva)
• Committee member: Zoran Marčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2021-02-19, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Fitnes se može definirati kao reproduktivni uspjeh jedinke određen brojem fertilnog potomstva. Važan aspekt brige za mlade kod ptica je dinamika hranjenja mladunaca koja ovisi o ponašanju ptića, ekologiji populacije i okolišnim uvjetima. Pregled utjecaja na dinamiku hranjenja, a time i uspješnost gniježđenja, omogućava predviđanje trenda populacije uslijed potencijalnih promjena u okolišu. Cilj istraživanja bio je utvrditi postoji li utjecaj temperature, vjetra i padalina na stopu hranjenja ptića kroz dan metodom video snimki fokalnih ženki crnoglave strnadice. Istraživanje je provedeno na polju Dazlina u blizini Pirovca kroz tri godine, od 2011. do 2013. Ukupno je analizirano sedam gnijezda. Značajan utjecaj na stopu hranjenja imali su temperatura, dob ptića te godina gniježđenja. Odnos temperature i stope hranjenja mladunaca nije bio linearan, s najvećom stopom hranjenja oko 26°C. Dob ptića je pozitivno utjecala na stopu hranjenja mladunaca, dok je kroz godine prosječna stopa hranjenja opadala. Jačina vjetra i veličina legla nije imala značajan utjecaj. Ovim istraživanjem opisana su prva saznanja o utjecaju vremenskih uvjeta na dinamiku hranjenja mladunaca crnoglave strnadice na području Hrvatske. Potrebno je provesti dodatna istraživanja na ekologiji vrste kako bi se dobio uvid u trend populacije uslijed povećanja prosječnih godišnjih temperatura na prostoru Mediterana.

Abstract (english)

Fitness can be defined as individual reproductive success determined by the number of fertile offspring. Provisioning is an important aspect of parental care in birds and is affected by nestling behaviour, population ecology and environmental conditions. Studying factors affecting provisioning patterns, and thus breeding success, enables estimating the effects of habitat changes on population trends. The aim of this study was to test the effects of ambient temperature, wind and precipitation on daily provisioning rates in the Black-headed Bunting by video recording focal females. The study was conducted during a three-year period, 2011-2013, in Dazlina field near Pirovac. A total of seven nests were analysed. Provisioning rate was significantly affected by temperature, nestling age and breeding year. The relationship between temperature and provisioning rate was non-linear, with provisioning rate peaking at around 26°C. The average provisioning rate was positively affected by nestling age, but decreased across study years. No significant effect was found for wind strength and brood size. This study describes the first insight into the effects of weather conditions on nestling provisioning in the Black-headed Bunting in Croatia. Further studies are necessary in order to study the ecology of Black-headed buntings and thereby provide further insights into the potential population trend regarding the rise of average annual temperatures in the Mediterranean.

• Keywords: temperatura; vjetar; stopa hranjenja; globalno zatopljenje; Mediteran
• Keywords (english): temperature; wind; global warming; feeding rate; Mediterranean
• Language: croatian
• URN:NBN: urn:nbn:hr:217:234594
• 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; Embargo expiration date: 2023-02-19
• Created on: 2021-02-24 12:46:41