Diets of Wedge-tailed Eagles (Aquila Audax) and Little Eagles (Hieraaetus Morphnoides) breeding near Canberra, Australia.

Jerry Olsen, David Kendall JUDGE, Ernesto Esteban FUENTES, A Rose, Stephen Debus

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Recent concern about the decline of the Little Eagle (Hieraaetus morphnoides) in southeastern Australia has raised questions about whether Wedge-tailed Eagles (Aquila audax) might be implicated in this decline. The ecology, including the diet, of Little Eagles is rather poorly known. The diet of the Wedgetailed Eagle is better documented, but the overlap in prey used by the two eagles has been little studied. Near Canberra between July 2002 and January 2008, we identified 1421 and 192 prey items from nests of Wedge-tailed Eagles and Little Eagles, respectively. Wedge-tailed Eagles’ diet was similar to that reported elsewhere. In addition to European rabbits (Oryctolagus cuniculus), Little Eagles specialized on birds, but tended to avoid macropods, a main prey of Wedge-tailed Eagles, and there was little overlap in prey used by the two eagle species. Although Standardised Food Niche Breadth and Shannon Diversity Index were similar for the two eagles, Wedge-tailed Eagles captured significantly larger prey, as indicated by the difference in Geometric Mean Prey Weight, 1298 g for Wedge-tailed Eagles and 249 g for Little Eagles, which reflected the fivefold difference in mass between male Little Eagles and male Wedge-tailed Eagles. We suggest that direct competition for prey probably was not the cause of the Little Eagle decline.
    Original languageEnglish
    Pages (from-to)50-61
    Number of pages12
    JournalJournal of Raptor Research
    Volume44
    Issue number1
    DOIs
    Publication statusPublished - 2010

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    Olsen, Jerry ; JUDGE, David Kendall ; FUENTES, Ernesto Esteban ; Rose, A ; Debus, Stephen. / Diets of Wedge-tailed Eagles (Aquila Audax) and Little Eagles (Hieraaetus Morphnoides) breeding near Canberra, Australia. In: Journal of Raptor Research. 2010 ; Vol. 44, No. 1. pp. 50-61.
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    abstract = "Recent concern about the decline of the Little Eagle (Hieraaetus morphnoides) in southeastern Australia has raised questions about whether Wedge-tailed Eagles (Aquila audax) might be implicated in this decline. The ecology, including the diet, of Little Eagles is rather poorly known. The diet of the Wedgetailed Eagle is better documented, but the overlap in prey used by the two eagles has been little studied. Near Canberra between July 2002 and January 2008, we identified 1421 and 192 prey items from nests of Wedge-tailed Eagles and Little Eagles, respectively. Wedge-tailed Eagles’ diet was similar to that reported elsewhere. In addition to European rabbits (Oryctolagus cuniculus), Little Eagles specialized on birds, but tended to avoid macropods, a main prey of Wedge-tailed Eagles, and there was little overlap in prey used by the two eagle species. Although Standardised Food Niche Breadth and Shannon Diversity Index were similar for the two eagles, Wedge-tailed Eagles captured significantly larger prey, as indicated by the difference in Geometric Mean Prey Weight, 1298 g for Wedge-tailed Eagles and 249 g for Little Eagles, which reflected the fivefold difference in mass between male Little Eagles and male Wedge-tailed Eagles. We suggest that direct competition for prey probably was not the cause of the Little Eagle decline.",
    author = "Jerry Olsen and JUDGE, {David Kendall} and FUENTES, {Ernesto Esteban} and A Rose and Stephen Debus",
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    Diets of Wedge-tailed Eagles (Aquila Audax) and Little Eagles (Hieraaetus Morphnoides) breeding near Canberra, Australia. / Olsen, Jerry; JUDGE, David Kendall; FUENTES, Ernesto Esteban; Rose, A; Debus, Stephen.

    In: Journal of Raptor Research, Vol. 44, No. 1, 2010, p. 50-61.

    Research output: Contribution to journalArticle

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