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Tahr's Long Tail: A Gift That Keeps Changing Mountains
17 Oct
Summary
- Six Himalayan tahr introduced in 1904 dramatically altered New Zealand's alpine flora.
- Population fluctuations occurred, with numbers reduced from 50,000 to 2,000 by 1983.
- Long-term studies show tahr activity significantly impacts plant cover and tussock height.
Himalayan tahr, a species introduced to New Zealand in 1904 as a hunting novelty, have had a significant and lasting impact on the country's alpine environments. Originally a gift of six animals from a British duke, these goat-like creatures were released in the Southern Alps.
Their population experienced dramatic shifts, notably a sharp decline from approximately 50,000 to 2,000 individuals between 1970 and 1983 due to commercial hunting efforts. However, numbers have since increased, with recent estimates suggesting nearly 30,000 tahr on public conservation land.
A study tracking tahr activity over two decades revealed a direct correlation between increased grazing and reduced tussock height and plant cover. Without natural predators in New Zealand, the tahr population continues to influence the delicate balance of alpine flora.
Conservation efforts, guided by a 1993 plan, aim to manage tahr numbers, with hunters playing a crucial role. The enduring ecological effects underscore the importance of considering long-term consequences before introducing non-native grazing animals.
