nick isaac, tom august & gary powney
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@drnickisaac. Trends in British Biodiversity since 1970. Nick Isaac, Tom August & Gary Powney. Biodiversity in Crisis. - PowerPoint PPT PresentationTRANSCRIPT
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Nick Isaac, Tom August & Gary Powney
Trends in British Biodiversity since 1970
@drnickisaac
![Page 2: Nick Isaac, Tom August & Gary Powney](https://reader035.vdocument.in/reader035/viewer/2022062501/56816595550346895dd86927/html5/thumbnails/2.jpg)
Biodiversity in Crisis
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Target 12By 2020 the extinction of known threatened species has been prevented and their conservation status, particularly of those most in decline, has been improved and sustained.
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• Population time-series• Annual estimates of status• Taxonomically restricted
How do we know if the targets have been met?
• Red List indices• Many species• Temporally-imprecise
Botham et al (2011) UK Butterfly Monitoring Scheme Annual Report 2011.
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Biological records: the third way
• Volunteer citizen scientists have been recording biodiversity for centuries
• A rich source of data for measuring change
• But the data are biased in space and time
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Atlases: Stock & change in distribution
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Biodiversity change using atlases
Thomas, JA et al. (2004). Comparative losses of British butterflies, birds, and plants and the global extinction crisis. Science, 303 1879–81
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Estimating trends from biological records
http://figshare.com/articles/Extracting_trends_from_citizen_science_data_BES_version_/778699
MethodData Trends
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Trends in British Biodiversity since 1970
• What proportion of species are declining?• What are the net changes in biodiversity?• Which taxa are doing best/worst?• Are common or rare species faring best?
Vertebrates
Plants
Other Invertebrates
Insects
0 500 1000 1500 2000 2500Number of species
Quantitative trends for >5000 species
No bird or mammals!
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Status of British Biodiversity since 1970• More species show significant increases (19%) than declines(14%)
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Significance = Power• More significant trends are apparent in groups with most data
Dragonflies & Damselflies
Moths
Long-hornbeetles
Soldier Beetles
Hoverflies
Vascular Plants
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Trends in British Biodiversity 1990-2000• Good news: Median change +2.4%; Net change +4%• Bad news: >1000 species would qualify as VU or worse
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Median
Comparative patterns among taxaBelow the line: Rare species are doing better than common (& vice versa)
Median % change
Net
% c
hang
e
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Conclusions
• Mixed news about the UK biodiversity• More increases than declines• Many species in steep decline
• Big losses among some groups, especially ladybirds & centipedes
• Substantial biotic homogenisation
• We can report against CBD targets for a much greater range of taxa than previously possible
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https://github.com/BiologicalRecordsCentrehttp://bit.ly/18wTrrK
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AcknowledgmentsColin Harrower, David Roy, Helen Roy, Michael Pocock, Chris PrestonMark Hill, Arco van Strien
@drnickisaac