| Abstrakt: |
Neophilic tendencies in scavenging species living near humans may have adverse consequences for these animals. New Zealand's kea (Nestor notabilis), an endangered parrot, potentially faces exacerbated mortality risk associated with proximity to humans. Hazards include lead building materials, introduced mammalian predators, and poison baits used to control these predators. How kea respond to these hazards can affect life expectancy. We modelled the effects of (1) proximity to humans, (2) age, (3) presence of conspecifics, and (4) blood lead levels, on the time taken to approach and contact a novel object. We also compared dietary trophic level between populations adjacent to and remote from humans using stable isotopes, and compared the age structure of these populations. Adjacent kea contacted the object faster than remote kea, as did younger individuals and those with elevated blood lead concentration, but conspecific presence did not affect approach latency. We conclude that adjacent kea exhibit enhanced neophilia, which may translate to reduced life expectancy due to interacting with anthropogenic hazards. Kea adjacent to humans were younger and foraged at a lower trophic level than remote kea, with a possible consequence of reduced productivity. Our results should be considered when setting management policy for kea habitat. [ABSTRACT FROM AUTHOR] |
