Since 1964 New Zealand conservation practitioners have gradually increased the size of islands from which it has been possible to eliminate rodent species (Towns and Broome 2003). This increase has been particularly marked since the 1980s, with the advent of new technologies at that time (Clout and Russell in press). The trends in eradication of introduced mammals, in particular rodents, from New Zealand offshore islands have been documented elsewhere (Veitch and Bell 1990; Clout and Russell in press). Clout and Russell (in press) also draw attention to the increasing number of rodent reinvasions, once islands have had their incumbent rodent species removed. Less well documented are the instances where a single or small number of rodents have been detected arriving at an island, but have not subsequently gone on to colonise the entire island. These ‘incursions’ highlight the constant threats and pathways of reinvasion by which rodent free islands, including those from which rodents have been eradicated, are at risk.
|Author||Russell, J. C. and Clout, M. N.|
|Secondary title||13th Australasian Vertebrate Pest Conference|
|Place published||Wellington, NZ|
|Institution||University of Auckland|