Diet, occupancy and breeding performance of wedge-tailed eagle Aquila audax near Canberra, Australia 2002-2003: four decades after Leopold and Wolfe

Ernesto Esteban FUENTES, Jerry Olsen, A Rose

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    W€ compared the diet and breeding performance of Wedge-tailed Eagles Aquila audax near Canberra in 2002-2003
    wiih that tound in the same area in 1964 by Leopoid and Wolfe (1970). We located a total of 44 active territories, and
    checked 26 of the 32 territories originally lound by Leopold and Wolfe. Twenty-two (85%) of the 26 were still occupied
    after nearly four decades. Contrary to what was found in the 1964 survey, nine active nests were located inside the city
    limits, with an average distance to paved roads of 720 + '132 metres (range 130-1 270 m) and to suburbs of 1 117 * 251
    metres (range 26G-2 000 m). Four nests were less than 500 metres from houses, but only one territory was completely
    surrounded by urban areas.
    Fledgling rates were greater in 2002-03 than in 1964 (l .1 versus 0.8 young per tenitory) mainly because more pajrs
    fledged two young in the 2002-2003 survey, and there was a decrease in the number of pairs lhat fledged no young.
    ln 2002-2003,492 prey items were recorded lrom 33 territories. Fifty-seven different species were found: '19
    mammals, 20 birds, seven reptiles and one crustacean. Mammals and birds were the dominant groups by number, 54.7
    and 41.9 percent respectively, and mammals dominated by biomass (95.3%). The breeding dist in 2002-2003 was
    dominated by macropods, representing 19.9 percent (n = 98) of the total items and 45.6 percont of biomass. The most
    important species among these macropods was the EasternG rey Kangaroo( 13.6 and 31.20,6b y number and biomass
    respectively)O. ther importanti temsw ere the EuropeanR abbit (16.9a nd 9.5% by numbera nd biomass)anda dult sheep
    (3.3 and 19.7%).A mong birds, the parrots and cockatoos, Order Psittaciformes,r epresented1 2.8 percent of the total
    items, but their contribution to the biomass was negligible (1.1%). Ihe Galah (5.1%, n = 25) and Australian Magpie
    (6.1%, n = 30) w€re the most important bird prey species.
    The propodional contribution of the different prey categories was signiticantly different between the two time
    periods. Three groups decreased significantly: European Rabbit (43.8% in 1964 v 16.9% in 2002-2003), Hare (15.8 v
    7.9%) and lamb (8.9 v 1.8%); and three others showed significant increases:m acropods (1.9 v 19.4o/o:)p,a rrots (3.5 v
    10.9%) and Other Birds (4.6 v 17o^r.
    As long as the current high levels of diverse prey are avaihble for the eagles near Canberra, it is likely that the
    population will remain stable, and young fledged per territory will remain high.
    Original languageEnglish
    Pages (from-to)65-72
    Number of pages8
    JournalCorella
    Volume31
    Issue number3/4
    Publication statusPublished - 2007

    Fingerprint

    Aquila
    eagles
    reproductive performance
    breeding
    diet
    bird
    birds
    biomass
    nests
    mammals
    Psittaciformes
    nest
    mammal
    Macropodidae
    hares
    parrots
    birds of prey
    urban areas
    reptiles
    roads

    Cite this

    @article{1990dfacdc7f4904a3d8a4254704b707,
    title = "Diet, occupancy and breeding performance of wedge-tailed eagle Aquila audax near Canberra, Australia 2002-2003: four decades after Leopold and Wolfe",
    abstract = "W€ compared the diet and breeding performance of Wedge-tailed Eagles Aquila audax near Canberra in 2002-2003wiih that tound in the same area in 1964 by Leopoid and Wolfe (1970). We located a total of 44 active territories, andchecked 26 of the 32 territories originally lound by Leopold and Wolfe. Twenty-two (85{\%}) of the 26 were still occupiedafter nearly four decades. Contrary to what was found in the 1964 survey, nine active nests were located inside the citylimits, with an average distance to paved roads of 720 + '132 metres (range 130-1 270 m) and to suburbs of 1 117 * 251metres (range 26G-2 000 m). Four nests were less than 500 metres from houses, but only one territory was completelysurrounded by urban areas.Fledgling rates were greater in 2002-03 than in 1964 (l .1 versus 0.8 young per tenitory) mainly because more pajrsfledged two young in the 2002-2003 survey, and there was a decrease in the number of pairs lhat fledged no young.ln 2002-2003,492 prey items were recorded lrom 33 territories. Fifty-seven different species were found: '19mammals, 20 birds, seven reptiles and one crustacean. Mammals and birds were the dominant groups by number, 54.7and 41.9 percent respectively, and mammals dominated by biomass (95.3{\%}). The breeding dist in 2002-2003 wasdominated by macropods, representing 19.9 percent (n = 98) of the total items and 45.6 percont of biomass. The mostimportant species among these macropods was the EasternG rey Kangaroo( 13.6 and 31.20,6b y number and biomassrespectively)O. ther importanti temsw ere the EuropeanR abbit (16.9a nd 9.5{\%} by numbera nd biomass)anda dult sheep(3.3 and 19.7{\%}).A mong birds, the parrots and cockatoos, Order Psittaciformes,r epresented1 2.8 percent of the totalitems, but their contribution to the biomass was negligible (1.1{\%}). Ihe Galah (5.1{\%}, n = 25) and Australian Magpie(6.1{\%}, n = 30) w€re the most important bird prey species.The propodional contribution of the different prey categories was signiticantly different between the two timeperiods. Three groups decreased significantly: European Rabbit (43.8{\%} in 1964 v 16.9{\%} in 2002-2003), Hare (15.8 v7.9{\%}) and lamb (8.9 v 1.8{\%}); and three others showed significant increases:m acropods (1.9 v 19.4o/o:)p,a rrots (3.5 v10.9{\%}) and Other Birds (4.6 v 17o^r.As long as the current high levels of diverse prey are avaihble for the eagles near Canberra, it is likely that thepopulation will remain stable, and young fledged per territory will remain high.",
    author = "FUENTES, {Ernesto Esteban} and Jerry Olsen and A Rose",
    year = "2007",
    language = "English",
    volume = "31",
    pages = "65--72",
    journal = "Corella",
    issn = "0155-0438",
    publisher = "The Australian Bird Study Association",
    number = "3/4",

    }

    Diet, occupancy and breeding performance of wedge-tailed eagle Aquila audax near Canberra, Australia 2002-2003: four decades after Leopold and Wolfe. / FUENTES, Ernesto Esteban; Olsen, Jerry; Rose, A.

    In: Corella, Vol. 31, No. 3/4, 2007, p. 65-72.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Diet, occupancy and breeding performance of wedge-tailed eagle Aquila audax near Canberra, Australia 2002-2003: four decades after Leopold and Wolfe

    AU - FUENTES, Ernesto Esteban

    AU - Olsen, Jerry

    AU - Rose, A

    PY - 2007

    Y1 - 2007

    N2 - W€ compared the diet and breeding performance of Wedge-tailed Eagles Aquila audax near Canberra in 2002-2003wiih that tound in the same area in 1964 by Leopoid and Wolfe (1970). We located a total of 44 active territories, andchecked 26 of the 32 territories originally lound by Leopold and Wolfe. Twenty-two (85%) of the 26 were still occupiedafter nearly four decades. Contrary to what was found in the 1964 survey, nine active nests were located inside the citylimits, with an average distance to paved roads of 720 + '132 metres (range 130-1 270 m) and to suburbs of 1 117 * 251metres (range 26G-2 000 m). Four nests were less than 500 metres from houses, but only one territory was completelysurrounded by urban areas.Fledgling rates were greater in 2002-03 than in 1964 (l .1 versus 0.8 young per tenitory) mainly because more pajrsfledged two young in the 2002-2003 survey, and there was a decrease in the number of pairs lhat fledged no young.ln 2002-2003,492 prey items were recorded lrom 33 territories. Fifty-seven different species were found: '19mammals, 20 birds, seven reptiles and one crustacean. Mammals and birds were the dominant groups by number, 54.7and 41.9 percent respectively, and mammals dominated by biomass (95.3%). The breeding dist in 2002-2003 wasdominated by macropods, representing 19.9 percent (n = 98) of the total items and 45.6 percont of biomass. The mostimportant species among these macropods was the EasternG rey Kangaroo( 13.6 and 31.20,6b y number and biomassrespectively)O. ther importanti temsw ere the EuropeanR abbit (16.9a nd 9.5% by numbera nd biomass)anda dult sheep(3.3 and 19.7%).A mong birds, the parrots and cockatoos, Order Psittaciformes,r epresented1 2.8 percent of the totalitems, but their contribution to the biomass was negligible (1.1%). Ihe Galah (5.1%, n = 25) and Australian Magpie(6.1%, n = 30) w€re the most important bird prey species.The propodional contribution of the different prey categories was signiticantly different between the two timeperiods. Three groups decreased significantly: European Rabbit (43.8% in 1964 v 16.9% in 2002-2003), Hare (15.8 v7.9%) and lamb (8.9 v 1.8%); and three others showed significant increases:m acropods (1.9 v 19.4o/o:)p,a rrots (3.5 v10.9%) and Other Birds (4.6 v 17o^r.As long as the current high levels of diverse prey are avaihble for the eagles near Canberra, it is likely that thepopulation will remain stable, and young fledged per territory will remain high.

    AB - W€ compared the diet and breeding performance of Wedge-tailed Eagles Aquila audax near Canberra in 2002-2003wiih that tound in the same area in 1964 by Leopoid and Wolfe (1970). We located a total of 44 active territories, andchecked 26 of the 32 territories originally lound by Leopold and Wolfe. Twenty-two (85%) of the 26 were still occupiedafter nearly four decades. Contrary to what was found in the 1964 survey, nine active nests were located inside the citylimits, with an average distance to paved roads of 720 + '132 metres (range 130-1 270 m) and to suburbs of 1 117 * 251metres (range 26G-2 000 m). Four nests were less than 500 metres from houses, but only one territory was completelysurrounded by urban areas.Fledgling rates were greater in 2002-03 than in 1964 (l .1 versus 0.8 young per tenitory) mainly because more pajrsfledged two young in the 2002-2003 survey, and there was a decrease in the number of pairs lhat fledged no young.ln 2002-2003,492 prey items were recorded lrom 33 territories. Fifty-seven different species were found: '19mammals, 20 birds, seven reptiles and one crustacean. Mammals and birds were the dominant groups by number, 54.7and 41.9 percent respectively, and mammals dominated by biomass (95.3%). The breeding dist in 2002-2003 wasdominated by macropods, representing 19.9 percent (n = 98) of the total items and 45.6 percont of biomass. The mostimportant species among these macropods was the EasternG rey Kangaroo( 13.6 and 31.20,6b y number and biomassrespectively)O. ther importanti temsw ere the EuropeanR abbit (16.9a nd 9.5% by numbera nd biomass)anda dult sheep(3.3 and 19.7%).A mong birds, the parrots and cockatoos, Order Psittaciformes,r epresented1 2.8 percent of the totalitems, but their contribution to the biomass was negligible (1.1%). Ihe Galah (5.1%, n = 25) and Australian Magpie(6.1%, n = 30) w€re the most important bird prey species.The propodional contribution of the different prey categories was signiticantly different between the two timeperiods. Three groups decreased significantly: European Rabbit (43.8% in 1964 v 16.9% in 2002-2003), Hare (15.8 v7.9%) and lamb (8.9 v 1.8%); and three others showed significant increases:m acropods (1.9 v 19.4o/o:)p,a rrots (3.5 v10.9%) and Other Birds (4.6 v 17o^r.As long as the current high levels of diverse prey are avaihble for the eagles near Canberra, it is likely that thepopulation will remain stable, and young fledged per territory will remain high.

    M3 - Article

    VL - 31

    SP - 65

    EP - 72

    JO - Corella

    JF - Corella

    SN - 0155-0438

    IS - 3/4

    ER -