Boakes et al. compile and analyze a historical dataset of 170,000 bird sightings over two centuries and show how changing trends in data gathering may confound a true picture of biodiversity change.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2879389 | PMC |
http://dx.doi.org/10.1371/journal.pbio.1000385 | DOI Listing |
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