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ŠUMARSKI LIST 3-4/2022 str. 55     <-- 55 -->        PDF

Dates of arrival of the Eurasian golden oriole (Oriolus oriolus L.) in decidious forest in relation to increase of local air temperature in NW Croatia
Datumi povratka vuge (Oriolus oriolus L.) Sa zimovanja u bjelogorične šume sjeverozapadne Hrvatske u odnosu na sve toplija proljeća
Zdravko Dolenec
Summary
Numerous regions worldwide are affected by Earth climate warming. Most studies of bird phenology in relation to global and regional climate change have focused on trends in arrival dates and breeding dates. The study investigates the results of phenological spring migration research on Eurasian Golden Oriole during a period of 26 years (1991–2016) in relation to average spring air temperatures (April–May) and year in deciduous forests (northwestern Croatia). Data is available for spring arrivals detected by the first song. Arrival date advanced significantly during the research period. According to the linear regression slopes, models suggested that in Eurasian Golden Oriole arrival date has advanced 6 days in period 1991–2016. Furthermore, average spring air temperatures (April–May) increased significantly during the study period. Furthermore, date of arrival was significantly negative correlated with average spring temperatures. My results provide evidence that warms spring has impacted spring migration arrival dates of Eurasian golden oriole of the deciduous forests in northwestern Croatia.
Key words: Eurasian Golden Oriole, Oriolus oriolus L., spring migration, spring temperature, deciduous forests, NW Croatia
INTRODUCTION
UVOD
Earth climate warming has affected numerous regions worldwide (Parmesan, 2006). There are abundant documents of advances in spring phenology in different organisms over long-term period in relations to climate change, for example, plant flowering earlier in Hungary (Szabó et al., 2016). Most studies of bird phenology in relation to global and regional climate change have focused on trends in arrival dates and breeding dates. Earlier breeding dates have been associated in numerous species with higher air temperatures in some countries in Northern Hemisphere and South Hemisphere (Potti, 2009) and among them is also Croatia (Dolenec et al., 2012; Dolenec, 2019a). Earlier spring migration phenology is also associated with higher air temperatures in Croatia (Dolenec and Dolenec, 2010a; Dolenec 2019b) and other countries (Kolářová et al., 2017; Vengerov, 2017). Generally, early arrival is often linked with migration distance. In shorter-distance migrants