A telemetry study to discriminate between home range and territory size in Tawny Owls

Burgos, Gorka; Zuberogoitia, Íñigo

doi:10.1080/09524622.2018.1555717

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…One novel finding, however, is that we detected a quadratic effect, indicating that both extensive forest areas and small patches of forest negatively affected tawny owl abundance (for similar results, see also [40]), this being different to results obtained in another work [41]. It seems, therefore, that the species may benefit from using woodland areas with some degree of forest fragmentation, with the non-forested areas comprising small patches of open habitats such as grasslands, meadows, or pastures [42]. Urbanization showed a forest-dependent effect in addition to its overall negative effect.…”

Section: Discussioncontrasting

confidence: 87%

“…This is probably due to the permanent food supplies that urban environments provide [43], as well as the availability of suitable new nesting and roosting sites [44]. In addition, it has been demonstrated that home range size decreases at the intermediate level of forested area [42], with higher densities being found in urban areas mixed with patchily distributed forests than in purely forested areas [20,45], but always depending on the proportion of suitable habitats available [19]. Regarding the aggregation level of urban patches (CLU), something similar happens in areas of low urbanization (<10%), where aggregation level has a slight, nearly constant, effect on tawny owl abundance.…”

Section: Discussionmentioning

confidence: 99%

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Colonization of Urban Habitats: Tawny Owl Abundance Is Conditioned by Urbanization Structure

Pagaldai

Arizaga

Jiménez‐Franco

et al. 2021

Animals

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Natural habitats are being altered and destroyed worldwide due to urbanization, leading to a decrease in species abundance and richness. Nevertheless, some species, including tawny owls, have successfully colonized this novel habitat. Consequences at the population level have not been described; thus, our main objective was to describe the effects that urban structure have on the tawny owl population at local and landscape levels. Data were obtained from 527 survey points over 7 months in a large-scale owl survey in the Basque Country (northern Spain) in 2018. At the local scale, the interaction between forest and urban cover affected tawny owl abundance, the optimum being in medium forested areas. The interaction between urban cover and clumpiness index (urban patch distribution) showed a generally negative effect. At the landscape scale, its abundance decreased in complex-shaped urban patches and when distance between them was greater. In conclusion, at the local scale, when a minimal forest structure is present in urbanized areas, the species can exploit it. At the landscape scale, it prefers smaller urban towns to cities. Thinking ahead, the current tendency toward “green capitals” should benefit tawny owl populations.

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Section: Discussioncontrasting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Colonization of Urban Habitats: Tawny Owl Abundance Is Conditioned by Urbanization Structure

Pagaldai

Arizaga

Jiménez‐Franco

et al. 2021

Animals

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“…Most of the cells that were not sampled were excluded due to their inaccessibility (i.e., private land, steep slopes, etc.). The territory of a Tawny Owl pair is in fact bigger than the scale of our survey unit (31.11ha in urban areas) (Burgos & Zuberogoitia, 2018), so the survey data obtained here was only useful for studying its presence-absence, not to calculate abundance.…”

Section: Methodsmentioning

confidence: 99%

Factors Shaping Occurrence Probability of a Generalist Raptor Species across an Urban-Rural Gradient

Pagaldai

Rodríguez‐Pérez

Arnaiz

et al. 2023

Ardeola

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Urbanization constitutes one of the most intensive and fast spreading factors explaining biodiversity loss worldwide. The extension of urban areas and landscape configurations affects the ability of raptors to exploit urban patches. The Tawny Owl Strix aluco is a forest-dwelling nocturnal species with a wide distribution range that is well-adapted to urban environments. However, it remains unknown which habitat factors explain its presence in urban-associated landscapes. Our main objective is to determine the effect of urban landscapes on the probability of occurrence of Tawny Owls along an urban-rural gradient. It is expected that Tawny Owls will be able to use urban patches that have (1) at least 30% tree cover thanks to gardens/parks for hunting but (2) they will not use those with high noise levels (i.e., highways). Our research was carried out in the municipality of Donostia-San Sebastian in the Basque Country, Northern Spain. Data were obtained from a survey conducted in 2017. The municipality was divided into 329 square cells, of which 251 were surveyed. Tawny Owls were detected in 141 cells, and we found that nocturnal noise level and scrub cover contributed most to explaining the probability of Tawny Owl occurrence; with nocturnal noise having a significant negative effect on occurrence probability, and scrub cover a positive effect, probably because the species uses open or semi-open areas to hunt (but woodland to breed). Overall, it can be concluded that the very noisy and/or urbanized parts of the city comprised a non-optimal habitat for the species.-Pagaldai, N., Rodríguez-

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“…500 m to 1596 m a.s.l. Parent rock consists predominantly of dolomites, limestones and marly limestones (Biely et al 2002). The relief of the mountain range is quite rugged, with a large elevational range.…”

Section: S T U D Y a R E Amentioning

confidence: 99%

Spatial distribution of four sympatric owl species in Carpathian montane forests

et al. 2020

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Knowledge about spatial distribution of owl species is important for inferring species coexistence mechanisms. In the present study, we explore spatial patterns of distribution and habitat selection of four owl species – Eurasian pygmy owl (Glaucidium passerinum), boreal owl (Aegolius funereus), tawny owl (Strix aluco) and Ural owl (Strix uralensis) – ranging in body mass from 50 g to 1300 g, with sympatric occurrence in temperate continuous montane forests in the Veľká Fatra Mts., Western Carpathians, central Slovakia. Locations of hooting owl males were surveyed between 2009–2015 in an area of 317 km2. Spatial point pattern analysis was used for analysis of owl distribution. Random patterns of owls’ spatial arrangement dominate at both intra‐ and interspecific levels within the studied area. Only intraspecific distribution of pygmy owls and interspecific distribution of Ural owls toward tawny owls exhibited positive associations. This discrepancy with other studies can be explained in terms of pygmy owls’ preference for high‐quality nest sites and/or spatial clustering in their prey distribution, and due to aggressive behaviour of dominant Ural owls toward subdominant tawny owls, respectively. Moreover, we found considerable overlap in habitat preferences between owl species, considering stand age, stand height, tree species richness, distance to open area, elevation, slope, percentage of coniferous tree species and position on hillslope, although pygmy owls were not registered in pure broadleaved stands, Ural owls were not registered in pure coniferous stands, and boreal and Ural owls were more common on slope summits and shoulders than tawny and pygmy owls. The observed patterns of spatial arrangement might suggest developed coexistence mechanisms in these owl species; differences between studies may indicate complex interactions between intra‐ and interspecific associations and habitat quality and quantity, food availability and owl species involved in those interactions on a landscape scale.

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A telemetry study to discriminate between home range and territory size in Tawny Owls

Cited by 15 publications

References 29 publications

Colonization of Urban Habitats: Tawny Owl Abundance Is Conditioned by Urbanization Structure

Colonization of Urban Habitats: Tawny Owl Abundance Is Conditioned by Urbanization Structure

Factors Shaping Occurrence Probability of a Generalist Raptor Species across an Urban-Rural Gradient

Spatial distribution of four sympatric owl species in Carpathian montane forests

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