Weeds head for the hills as climate warms


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Weeds head for the hills as climate warms

Mumbai, August 11, 2017: Scientists are warning that alpine plants are at risk of extinction as climate change, skiing and mountain tourism spread weeds to higher altitudes.

The latest research* shows that as temperatures have risen, plants have spread up mountainsides, with weeds being the fastest movers, spreading to higher altitudes twice as fast as native plants.

“We know native plants are moving up mountains as climate warms, but until now no-one had looked at how non-native weeds might respond,” says Professor Philip Hulme of the Bio-Protection Research Centre, Lincoln University.

The international team of researchers discovered that weeds quickly outpaced other plants. It seems that roads are amongst the culprits, with traffic helping to transport seeds further.

These findings should raise concerns for New Zealand’s unique alpine environments explains Professor Hulme.  “I suspect the situation is possibly more dire in New Zealand given that our lowland regions are far more invaded by non-native weeds than similar regions in Europe. Our montane (mountain ecosystems) regions are coming under increasing pressure from tourism, skiing developments and other infrastructure such as roads,” he continues.

The research, published in Nature Climate Change, used more than 130,000 records of 1334 plant species collected over 20 years in a single region of the European Alps.

“The challenge for New Zealand is that we are no longer collecting the systematic, long-term data on how our flora are changing in these environments,” says Professor Hulme, “such data are essential if we want to keep our glorious mountain landscapes free of weeds such as gorse, broom and wilding pines.”

The authors of the study point out that such rapid spread into vulnerable habitats is a further threat to species already stressed by higher temperatures.

“We must take action soon otherwise our native alpine plant communities are likely to suffer dramatic changes with ongoing warming and increasing human activity in mountain regions,” concludes Professor Hulme.

*Dainese M, Aikio S, Hulme PE, Bertolli A, Prosser F, Marini L (2017) Non-native plant species are moving upwards faster than natives in the Alps. Nature Climate Change DOI: 10.1038/NCLIMATE3337

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