Colonisation of the Eurasian Goshawk Astur gentilis into an urban environment in Finland

Colonisation of the Eurasian Goshawk Astur gentilis into an urban environment in Finland | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 22 February 2025 V1 Latest version Share on Colonisation of the Eurasian Goshawk Astur gentilis into an urban environment in Finland Author : Tapio Solonen 0000-0002-4817-3942 [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.174021482.22878895/v1 232 views 159 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract There are several hypotheses for the significance of urban colonisation of animals but an exhaustive explanation is still missing. The question arises: is the colonisation a successful process or a detrimental misstep? Here, I describe the first case of urban colonisation of the Eurasian Goshawk in Finland, where the species is traditionally known as a shy, resident bird of remote wilderness and rural areas. I predict, that if the urban habitats are more favourable for goshawks than the habitats in Finland in general, 1) population trends should be more positive, 2) breeding output should be higher, and 3) population size and breeding output should be less affected by winter weather conditions. The urban goshawk population showed a highly significant increasing trend during the study (1996–2022), while the number of territories recorded elsewhere in Finland decreased significantly. The average annual mean brood size was not higher in the urban population than elsewhere in Finland. Winter temperatures affected the population size of the goshawk positively in urban habitats and positively or negatively elsewhere. The breeding populations crashed only after extremely cold winters, and recovered thereafter. Given that food availability over winter may be higher and energy requirements lower in warmer winters, it is possible that food promoted the colonisation of Helsinki by goshawks. Present results largely support the idea that the urban colonisation of the Eurasian Goshawk is a successful process. However, for a longer term the possibility of a detrimental misstep can not be excluded. Supplementary Material File (cover_letter_poec-2024-0059_revised.pdf) Download 136.94 KB File (main document_poec-2024-0059_revised.docx) Download 50.80 KB Information & Authors Information Version history V1 Version 1 22 February 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords 1.100: population ecology 1: field of ecology 2.020: biological invasion 2.070: population dynamics 2: topic 3.050: birds 3: organisms brood size food supply persecution population trends winter temperature Authors Affiliations Tapio Solonen 0000-0002-4817-3942 [email protected] View all articles by this author Metrics & Citations Metrics Article Usage 232 views 159 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Tapio Solonen. Colonisation of the Eurasian Goshawk Astur gentilis into an urban environment in Finland. Authorea . 22 February 2025. DOI: https://doi.org/10.22541/au.174021482.22878895/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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