Tag Archives: predators

The threat posed by pest animals to biodiversity in New South Wales

Alien species (pest animals and weeds) are acknowledged widely as a major cause of global biodiversity decline. However, there are very few studies that have quantified the specific biodiversity at risk from alien species, or the alien species posing the threat. This lack of knowledge has hampered policy development and alien species management directed at […]

Detecting predation of a burrow-nesting seabird by two introduced predators, using stable isotopes, dietary analysis and experimental removals

Burrowing seabirds are vulnerable to extirpation by introduced predators such as rats, but much evidence of predation is circumstantial. On Taukihepa, an island off southern New Zealand, two possible predators exist with sooty shearwaters (Puffinus griseus): the weka (Gallirallus australis), a large rail, and the ship rat (Rattus rattus), both introduced to the island. It […]

Introduced mammals in Australian rangelands: Future threats and the role of monitoring programmes in management strategies

In the present paper, we have provided an initial assessment of the current and future threats to biodiversity posed by introduced mammals (predators and herbivores) inhabiting the Australian rangelands, exploring trends in populations and options for management. Notably, rabbits have declined in recent years in the wake of rabbit haemorrhagic disease, populations of feral camels […]

Nest-site selection by yellow-eyed penguins Megadyptes antipodes on grazed farmland

The viability of Yellow-eyed Penguins Megadyptes antipodes on South Island, New Zealand, is threatened through the loss of breeding habitat by land clearance and the loss of chicks to introduced predatory mammals. Penguin nests at Papanui Beach, Otago Peninsula, were spread through about 7 ha of grazed grassland and shrubland. Here farming and Yellow-eyed Penguin […]

Do introduced predators compete with native carnivores?

The spotted-tailed quoll (Dasyurus maculatus) is a medium-sized marsupial carnivore that has declined in abundance and distribution since European settlement in Australia, and is now listed federally as an endangered species. Introduced predators are thought to have contributed to this decline. Foxes and feral cats occupy a similar dietary niche to that of quolls, and […]

The influence of visual obstructions on the vigilance and escape behaviour of house sparrows, Passer domesticus

The scanning and flight behaviour of birds that forage in flocks may be influenced by several variables, including the size of the flock and the presence of visual obstructions. Visual obstructions can conceal both potential predators and flock mates from a foraging bird, and individuals may increase their scanning rate accordingly, although concealing flock mates […]

Secondary poisoning of stoats (Mustela erminea) in a South Island podocarp forest, New Zealand: implications for conservation

This study tested the efficacy of secondary poisoning using Talon 20 P™ (20 ppm brodifacoum) in bait stations for killing predators in a New Zealand podocarp forest. Nine of 10 resident radio-tagged stoats (Mustela erminea) were killed after poisoning operations that killed mice (Mus musculus), ship rats (Rattus rattus) and brushtail possums (Trichosurus vulpecula). Possums […]

A comparison of cane toad and native tadpoles as predators of native anuran eggs, hatchlings and larvae

Few quantitative data exist regarding the impact of the introduced cane toad, Bufo marinus, on native Australian fauna. This study investigated predation by tadpoles of B. marinus and two native anurans (Limnodynastes ornatus and Litoria rubella) on eggs, hatchlings and larvae of native anurans that co-occur with these tadpoles in temporary and semi-permanent water bodies […]

Population dynamics of three species of dasyurid marsupials in arid central Australia: a 10-year study

This study investigated the population dynamics of three species of dasyurid marsupials in sand ridge habitat of the Simpson Desert, western Queensland, over a 10-year period between March 1990 and December 1999. The lesser hairy-footed dunnart (Sminthopsis youngsoni), was captured most consistently over the period of study, followed by the wongai ningaui (Ningaui ridei), and […]

Short-term ecological effects of rabbit haemorrhagic disease in the short-tussock grasslands of the South Island, New Zealand

Rabbit haemorrhagic disease (RHD) has reduced populations of rabbits (Oryctolagus cuniculus) across most rabbit-prone short-tussock grasslands of New Zealand, at scales rarely seen there before. Flow-on effects to other parts of these ecosystems will be inevitable. We report evidence for increases in pasture biomass, increases in abundance of other exotic herbivores, declines in abundance of […]

Factors affecting lamb survival

Every year in Australia approximately 11 million lambs die within a week of birth. Of these, 5% die before birth, 20% during birth and 75% after birth. This lamb mortility around the time of birth is the main form of lamb loss in our sheep flocks. Starvation, mismothering, exposure, difficult birth, predators, infection and other […]