Home range size and territorial calling of the Southern Boobook Ninox novaeseelandiae in adjacent territories

Gerald Olsen, Joni Downs, Tony TUCKER, Susan Trost

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Adjacent nesting home ranges of four radio-tagged Southern Boobooks (Ninox novaeseelandiae) were studied in a Canberra, Australia, woodland over 418 observation nights during four breeding seasons. Spatial locations and bouts of territorial calling (⿿boobook calls�) were recorded during each observation night. Home ranges and core areas were computed from the spatial locations using minimum convex polygons and characteristic hull polygons. Home-range sizes varied by individual owl, between breeding seasons, and by estimation method, ranging from 18.1 to 205.8 ha. Core-area estimates varied from 0.2 ha to 19.6 ha, indicating intensive use of core areas within much larger home ranges. Overall, about 26% of the boobooks' vocalizations occurred within core areas and about 56% within the home range but outside the core area, often near the border shared with the adjacent pair. Approximately 21% of boobook calls were observed on or outside home-range boundaries, which suggested that owls actively defended areas larger than their core areas.
    Original languageEnglish
    Pages (from-to)136-142
    Number of pages7
    JournalJournal of Raptor Research
    Volume45
    Issue number2
    DOIs
    Publication statusPublished - 2011

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    Strigiformes
    breeding season
    radio frequency identification
    vocalization
    hulls
    Ninox novaeseelandiae
    home range
    woodlands
    methodology

    Cite this

    Olsen, Gerald ; Downs, Joni ; TUCKER, Tony ; Trost, Susan. / Home range size and territorial calling of the Southern Boobook Ninox novaeseelandiae in adjacent territories. In: Journal of Raptor Research. 2011 ; Vol. 45, No. 2. pp. 136-142.
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    title = "Home range size and territorial calling of the Southern Boobook Ninox novaeseelandiae in adjacent territories",
    abstract = "Adjacent nesting home ranges of four radio-tagged Southern Boobooks (Ninox novaeseelandiae) were studied in a Canberra, Australia, woodland over 418 observation nights during four breeding seasons. Spatial locations and bouts of territorial calling ({\^a}¿¿boobook calls{\^a}¿�) were recorded during each observation night. Home ranges and core areas were computed from the spatial locations using minimum convex polygons and characteristic hull polygons. Home-range sizes varied by individual owl, between breeding seasons, and by estimation method, ranging from 18.1 to 205.8 ha. Core-area estimates varied from 0.2 ha to 19.6 ha, indicating intensive use of core areas within much larger home ranges. Overall, about 26{\%} of the boobooks' vocalizations occurred within core areas and about 56{\%} within the home range but outside the core area, often near the border shared with the adjacent pair. Approximately 21{\%} of boobook calls were observed on or outside home-range boundaries, which suggested that owls actively defended areas larger than their core areas.",
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    author = "Gerald Olsen and Joni Downs and Tony TUCKER and Susan Trost",
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    Home range size and territorial calling of the Southern Boobook Ninox novaeseelandiae in adjacent territories. / Olsen, Gerald; Downs, Joni; TUCKER, Tony; Trost, Susan.

    In: Journal of Raptor Research, Vol. 45, No. 2, 2011, p. 136-142.

    Research output: Contribution to journalArticle

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