In 1769, a French explorer gifted Māori two pigs; their descendants helped establish feral pig populations in New Zealand
A French explorer's gift of two pigs in 1769 led to trade, escapes, and wild herds. Here is what science says about the damage they caused.
In 1907, Austria's Emperor Franz Joseph I gifted chamois, a type of mountain goat, to New Zealand. The animals, native to Europe, soon spread across the country and the South Island, feeding on alpine vegetation and causing concern for conservationists. A 2008 study found that chamois primarily consume herbs and woody plants, while tahr prefer grasses.
Both animals have changed their diets seasonally. To protect certain plants like Ranunculus, which includes buttercups, conservationists should control chamois populations. For snow tussocks, they should target tahr. However, the study notes that low tahr numbers could lead to increased chamois populations, potentially causing new problems.
Chamois are now found not only in mountain ranges but also in Westland forests, where a 2000 study found them from the timberline to sea level. They prefer areas like the Wanganui and Karangarua rivers, with the highest density between those rivers. The study also looked at chamois stomach contents, finding that they primarily eat Carmichaelia shrubs and Coprosma shrubs.
This research provides valuable data for conservation managers to make informed decisions and understand the long-term impacts of introducing non-native species to new environments.
Written by urgent.news from Hindustan Times - World News's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
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