even quite small rivers are an effective barrier to possum migration. So found ZIP (Zero Invasive Predators), in 2017, when they ran a trial in Remutaka Forest Park.
Last year, a similar trial began in the Perth River valley, to measure whether or not larger rivers are also an effective barrier to the migration of rats.
By 19 February 2019, after more than seven months of continuous bio-marking and trapping, confidence has grown. Trials were run across winter (where the river levels are lowest; the water is at its coldest; and rat breeding and dispersal activity is low), and across spring/summer (when the river levels rise as snow and ice melts; and rat breeding and movement increases).
“We are very encouraged by this promising result!” say the team.
Maybe, just maybe, some rats don’t like getting their feet wet!?
More information at Zero Invasive Predators Assessing the Perth River (and Scone Creek) as a barrier to rats
In Cloak of Protection, there are three rats: kiore; Norway; and Ship (shown).
Making Flight of Pollen we learnt that the endangered sort-tailed bat / pekapeka (which is a phenomenal pollinator), has had much of its role in our Native bush, taken over by the Ship rat – when the rat doesn’t eat everything in sight ie the whole flower (of course)!