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Ecologists find new clues on climate change in 150 year-old pressed plants
Plants picked 150 years ago by Victorian collectors and held by the million in herbaria collections across the world could become a powerful – and much needed – new source of data for studying climate change.
In a paper published on 22 September in the British Ecological Society's Journal of Ecology, a team of ecologists from the University of Kent, University of East Anglia (UEA), University of Sussex and Royal Botanic Gardens (Kew) shows that plants pressed up to 150 years ago tell the same story about warmer springs resulting in earlier flowering as field-based observations of flowering made much more recently.
Until now, the scarcity of reliable long-term data on phenology – the study of natural climate-driven events such as the timing of trees coming into leaf or plants flowering each spring – has hindered scientists' understanding of how species respond to climate change.
The team examined 77 specimens of the early spider orchid (Ophrys sphegodes) collected between 1848 and 1958 and held at the Royal Botanic Gardens, Kew and the Natural History Museum in London. Because each specimen contains details of when and where it was picked, the researchers were able to match this with Meteorological Office records to examine how mean spring temperatures affected the orchids' flowering.
They then compared this data with field observations of peak flowering of the same orchid species in the Castle Hill National Nature Reserve, East Sussex from 1975 to 2006, and found that the response of flowering time to temperature was identical in both herbaria specimens and field data. In both the pressed plants and the field observations, the orchid flowered 6 days earlier for every 1oC rise in mean spring temperature.
The results are first direct proof that pressed plants in herbarium collections can be used to study relationships between pheonology and climate change when field-based data are not available, which is often the case.
Dr David Roberts, Lecturer in Biodiversity and Conservation at the University of Kent’s School of Anthropology and Conservation and the member of the team who instigated the project 7 years ago, said: ‘This is an extremely important result for climate change research as well as the role that natural history collections have to play in research. It’s amazing to think there are an estimated 2.5 billions specimens found in collections, such as that at Kew and the Natural History Museum, each with its own associated information of when and where the specimen was collected. For the vast majority of species, this is the only information we have. The beauty of these collections is that they have been collected over a long period of time, which is essential for studying climate change and makes them an extremely valuable resource.
‘Only by validating these specimens can we have confidence in the results that are drawn from using them. Now we can start looking at the effects of climate change on not just on individual plant species but also on interaction between plants and their pollinators, not just in temperate regions but also in the tropics where biodiversity is high but long-term phenological data is virtually none existent.’
According to PhD student Karen Robbirt, the study's lead author: ‘The results of our study are exciting because the flowering response to spring temperature was so strikingly close in the two independent sources of data. This suggests that pressed plant collections may provide valuable additional information for climate-change studies.
‘We found that the flowering response to spring temperature has remained constant, despite the accelerated increase in temperatures since the 1970s. This gives us some confidence in our ability to predict the effects of further warming on flowering times.’
The study opens up important new uses for the 2.5 billion plant and animal specimens held in natural history collections in museums and herbaria. Some specimens date back to the time of Linnaeus (who devised the system of naming plants and animals) 250 years ago.
Co-author Professor Tony Davy of UEA commented: ‘There is an enormous wealth of untapped information locked within our museums and herbaria that can contribute to our ability to predict the effects of future climate change on many plant species. Importantly it may well be possible to extend similar principles to museum collections of insects and animals.’
Phenology – or the timing of natural events – is an important means of studying the impact of climate change on plants and animals. However, detecting phenological trends in relation to long-term climate change is not straightforward and relies on scarce long-term studies.
Professor Davy added: ‘Recent climate change has undoubtedly affected the timing of development and seasonal events in many groups of organisms. Understanding the effects of recent climate change is a vital step towards predicting the consequences of future change. But only by elucidating the responses of individual species will we be able to predict the potentially disruptive effects of accelerating climate change on species interactions.
‘We need information collected over a long period to enable us confidently to identify trends that could be due to climate change. Unfortunately most field studies are relatively brief, so there are very few long-term field data available.’
Karen M Robbirt et al (2010), 'Validation of biological collections as a source of phenological data for use in climate change studies: a case study with the orchid Ophrys sphegodes', doi: 10.1111/j.1365-2745.2010.01727.x, is published in the Journal of Ecology on 22 September 2010.
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Story published at 9:20am 22 September 2010