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PLoS One. 2015 Aug 7;10(8):e0135152. doi: 10.1371/journal.pone.0135152. eCollection 2015.

Green Plants in the Red: A Baseline Global Assessment for the IUCN Sampled Red List Index for Plants.

Author information

1
Natural History Museum, Cromwell Road, South Kensington, London, United Kingdom.
2
Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom; School of Geography, University of Nottingham, Nottingham, United Kingdom.
3
Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom.
4
South African National Biodiversity Institute, KRC, Private Bag X7, Claremont, South Africa.
5
IUCN Red List Unit, Sheraton House, Castle Park, Cambridge, United Kingdom.
6
School of Biology, Dyers Brae, University of St Andrews, St Andrews, Fife, United Kingdom.
7
Natural History Museum, Cromwell Road, South Kensington, London, United Kingdom; Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom; King's College London, Strand, London, United Kingdom.
8
Natural History Museum, Cromwell Road, South Kensington, London, United Kingdom; Royal Botanic Gardens, Kew, Richmond, Surrey, United Kingdom.

Abstract

Plants provide fundamental support systems for life on Earth and are the basis for all terrestrial ecosystems; a decline in plant diversity will be detrimental to all other groups of organisms including humans. Decline in plant diversity has been hard to quantify, due to the huge numbers of known and yet to be discovered species and the lack of an adequate baseline assessment of extinction risk against which to track changes. The biodiversity of many remote parts of the world remains poorly known, and the rate of new assessments of extinction risk for individual plant species approximates the rate at which new plant species are described. Thus the question 'How threatened are plants?' is still very difficult to answer accurately. While completing assessments for each species of plant remains a distant prospect, by assessing a randomly selected sample of species the Sampled Red List Index for Plants gives, for the first time, an accurate view of how threatened plants are across the world. It represents the first key phase of ongoing efforts to monitor the status of the world's plants. More than 20% of plant species assessed are threatened with extinction, and the habitat with the most threatened species is overwhelmingly tropical rain forest, where the greatest threat to plants is anthropogenic habitat conversion, for arable and livestock agriculture, and harvesting of natural resources. Gymnosperms (e.g. conifers and cycads) are the most threatened group, while a third of plant species included in this study have yet to receive an assessment or are so poorly known that we cannot yet ascertain whether they are threatened or not. This study provides a baseline assessment from which trends in the status of plant biodiversity can be measured and periodically reassessed.

PMID:
26252495
PMCID:
PMC4529080
DOI:
10.1371/journal.pone.0135152
[Indexed for MEDLINE]
Free PMC Article

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