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The global impact of climate change on biodiversity

Posted on 21 January 2009

When three undergraduates set off on an expedition in 1965 to trap moths on Mount Kinabalu in Borneo, little did they realise that they were establishing the groundwork for a study of the impacts of climate change.

New research led by the University of York has repeated the survey 42 years later, and found that, on average, species had moved uphill by about 67 metres over the intervening years to cope with changes in climate.

Tropical insects form the most diverse group of animals on Earth but to-date we have not known whether they were responding to climate change

 I-Ching Chen

This is the first demonstration that climate change is affecting the distributions of tropical insects, the most numerous group of animals on Earth, thus representing a major threat to global biodiversity.

University of York PhD student I-Ching Chen — first author of the new study — said: "Tropical insects form the most diverse group of animals on Earth but to-date we have not known whether they were responding to climate change. The last Intergovernmental Panel on Climate Change AR4 Report showed a gaping hole in the evidence. Our new study is good in that it increases the evidence available, but it is potentially bad for biodiversity."

Professor Thomas added: "Large numbers of species are completely confined to tropical mountains, such as Mount Kinabalu: many of the species found by the expeditions have never been found anywhere else on Earth. As these species get pushed uphill towards cooler conditions, the amount of land that is available to them gets smaller and smaller. And because most of the top of the mountain is bare rock, they may not be able to find suitable habitats, even if the temperature is right. Some of the species are likely to die out."

The New Expedition in 2007 was joined by Henry Barlow, one of the members of the original survey, whose life-long enthusiasm for moths helped I-Ching Chen, who is from Taiwan, to come to terms with the sheer diversity of moths she had to identify.

The study is published in the latest edition of Proceedings of the National Academy of Sciences (PNAS).

Jeremy Holloway, a Research Associate at the Natural History Museum in London, and another member of the 1965 expedition, devoted his career to the identification (taxonomy) of moths from South East Asia, enabling the research team to identify the new samples. Armed with the data from 1965, moth-trapping equipment, tents, sleeping bags and rations, I-Ching and colleagues set out to repeat the original survey.

"Photographs from the 1965 expedition led us back to exactly the same sites sampled 42 years ago", said Dr Suzan Benedick, expedition member, and Universiti Malaysia Sabah entomologist.

The new survey involved climbing the mountain and catching moths up to an elevation of 3,675 metres above sea level. Once all of the specimens had been caught and identified, then the team compared the heights at which each species had been found in 1965 and again in 2007. The results revealed a highly statistically significant shift, indicating that the moths are now found higher on the mountain than previously.

There is a more positive note, however. As the highest and coolest location between the Himalaya and New Guinea, Mount Kinabalu represents an extremely important ‘climate change refuge’. Species that begin to find conditions too hot (or dry) in the surrounding lowlands may be able to find suitable conditions by moving upwards on the slopes of this mountain. "The critical thing is to protect the forests surrounding the mountain, so that the lowland species are able to reach the cooler conditions that they may need," said Dr Jane Hill, expedition member, and one of I-Ching Chen’s advisors.


Notes to editors:

  • Corresponding author: Professor Chris D Thomas, Department of Biology, University of York, PO Box 373, York YO10 5YW, UK. Phone +44-1904-328646, Email Professor Thomas is I-Ching Chen’s PhD supervisor.
  • I-Ching Chen is a PhD student, at the University of York. She is currently on leave.
  • Full Reference for New Study I-Ching Chen1, Hau-Jie Shiu2, Suzan Benedick3, Jeremy D. Holloway4, Vun Khen Chey5, Henry S. Barlow6, Jane K. Hill1 and Chris D. Thomas1 Elevation increases in moth assemblages over 42 years on a tropical mountain. Proceedings of the National Academy of Sciences, USA
    Publication online: 21-23 January 2009.
  • This project involved an international collaboration involving researchers in the UK, Malaysia and Taiwan, and was funded by the UK Government (DEFRA) Darwin Initiative. The institutions involved are as follows:
    • 1Department of Biology, University of York, PO Box 373, York YO10 5YW, UK
    • 2Graduate Institute of Environmental Sciences and Ecology, National University of Tainan, 33 Su-Lin St., Sec. 2, Tainan 700, Taiwan
    • 3School of Sustainable Agriculture, Universiti Malaysia Sabah, Aras 2, Blok B, Bangunan Sekolah Sains and Teknologi, Locked Bag 2073, 88999 Kota Kinabalu, Sabah, Malaysia
    • 4Department of Entomology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
    • 5Forest Research Centre of Sabah, Entomology Section, Sepilok, PO Box 1407, Postcode 90715, Sandakan, Malaysia
    • 6PO Box 10139, Postcode 50704, Kuala Lumpur, Malaysia
  • Winner of Visit London's 2008 Kids Love London Best Family Fun Award, the Natural History Museum is also a world-leading science research centre. Through its collections and scientific expertise, the Museum is helping to conserve the extraordinary richness and diversity of the natural world with groundbreaking projects in 68 countries

Contact details

Professor Chris Thomas

+44 (0)1904-328646