The World Conservation Union (IUCN) has developed quantitative criteria for assessing the conservation status of species. The criteria comprise five decision rules that specify threshold values in rates of decline, distributional range size, population size and risk of extinction. The criteria are currently under review to identify and resolve difficulties in their application. Four issues raised in the review include (i) the effect of skewed size distributions on the assessment of the number of populations or locations, (ii) the effect of varying scales on measurement and assessment of distributional range, (iii) structural parity between the range and population criteria (B and C), and (iv) the treatment of missing data. Unless resolved, these issues may result in biases in the outcomes of Red List assessments. We applied sensitivity analyses to explore the nature of these biases and examined how they might be overcome with relatively minor modifications to the criteria. We applied these analyses to a data set comprising 135 rare or threatened vascular plant species from south-eastern Australia. The analyses suggest that biases may be reduced by: excluding very small locations and subpopulations from consideration; adopting a scale for area of occupancy thresholds that is commensurate with a biologically appropriate scale for measurement; implementing a common structure of decision rules in range and population criteria to minimise differences in the way continuing declines, fragmentation and fluctuations are assessed; and adopting a precautionary protocol for invoking ‘Data Deficient’ status when assessments based on only one or few criteria fail to identify threatened status.
Biological Conservation – Elsevier
Published: Jul 1, 2000
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera