Andrew C.L. August's research while affiliated with New Zealand Department of Conservation and other places
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Publications (3)
The kaka (Nestor meridionalis) is an endemic parrot of New Zealand, and is nationally endangered. Conservation of the species is primarily dependent on intensive control of introduced mammalian nest predators, particularly stoats (Mustela erminea) and brushtail possums (Trichosurus vulpecula). Breeding was studied in 4 sites: Waipapa (1996-2002) an...
The kaka (Nestor meridionalis) is a threatened, endemic New Zealand parrot that is declining primarily because of predation by introduced mammals. Numbers of female kaka surviving to sexual maturity more than compensated for adult female mortality at three sites with predator control but not at three unmanaged sites. Nesting success at the sites wi...
To measure the costs and benefits of an aerial 1080 possum control operation to kereru and kaka in Whirinaki Forest Park, individuals of both species were radio-tagged from October 1998 to June 2002. We monitored birds in one treatment and one non-treatment study area to compare toxin-related mortality, nesting success and survival. The poison oper...
Citations
... The weight of the k ak a ranged from 444 to 588 g and averaged 524 g, resulting in the devices averaging 3.55% of the k ak a's body mass, with a range from 3.1% to 4.3%. These transmitter weights are all less than previous tracking studies of k ak a that have observed no ill-effects (Powlesland et al., 2009;Recio et al., 2016). When possible, k ak a were recaptured to remove the GPS device when the battery was depleted, which was expected to be 5-6 months given the GPS fix rate and duration of VHF and UHF windows, and health checks were again conducted. ...
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... Preferring native or unmodified forest, current distribution is marked by a severe reduction from habitat loss, predation, and overhunting with scattered records in Northland forests, from between South Rangaunu Harbour and Maungataniwha Ranges, South to near Dargaville, with many records round Whāngārei and Hen & Chicken Islands (Higgins, 1999, p. 624). Listed as a threatened endemic, Northland kākā were thought to have been vagrants, in non-resident populations, mainly attributed to predation from mustelids, the biggest threat on the mainland (Conning & Miller, 2000;Powlesland, Wills, August, & August, 2003). Bird surveys in six forests in the Far North in 1979 counted several individual birds; where surveys in the same forests in 1993 found only a single kākā (Higgins, 1999, p. 625). ...
... These traits suggest a propensity for exploration and innovation (Dunbar & Shultz, 2007;Sol et al., 2005), which has been observed particularly in juvenile k ak a (Bond & Diamond, 2004;Loepelt et al., 2016). Well understood threats to k ak a in wild populations are predominately the destruction of native habitat, predation by stoats (Mustela erminea) and competition for food resources by vespulid wasps and possums (Trichosurus vulpecula) (Beggs & Wilson, 1991;Greene et al., 2004;Moorhouse et al., 2003;O'Donnell & Rasch, 1991;Wilson et al., 1998). However, fragmented, semi-urban landscapes present novel threats that include human infrastructure, vehicles, cats, dogs, and traps, and toxins intended for pest species. ...
