Cited by 236Ecology and Vegetation Dynamics StudiesWildlife Ecology and ConservationConservation, Biodiversity, and Resource Management

The DOI matches its Crossref record; 37 of the 37 references it cites were found in a registry or an index; none of the 37 sources its claims cite is checked for support yet.

The Diversity-Weighted Living Planet Index: Controlling for Taxonomic Bias in a Global Biodiversity Indicator

Open access

Abstract

As threats to species continue to increase, precise and unbiased measures of the impact these pressures are having on global biodiversity are urgently needed. Some existing indicators of the status and trends of biodiversity largely rely on publicly available data from the scientific and grey literature, and are therefore prone to biases introduced through over-representation of well-studied groups and regions in monitoring schemes. This can give misleading estimates of biodiversity trends. Here, we report on an approach to tackle taxonomic and geographic bias in one such indicator (Living Planet Index) by accounting for the estimated number of species within biogeographical realms, and the relative diversity of species within them. Based on a proportionally weighted index, we estimate a global population decline in vertebrate species between 1970 and 2012 of 58% rather than 20% from an index with no proportional weighting. From this data set, comprising 14,152 populations of 3,706 species from 3,095 data sources, we also find that freshwater populations have declined by 81%, marine populations by 36%, and terrestrial populations by 38% when using proportional weighting (compared to trends of -46%, +12% and +15% respectively). These results not only show starker declines than previously estimated, but suggests that those species for which there is poorer data coverage may be declining more rapidly.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

The paper develops a diversity-weighted Living Planet Index (LPI-D) to correct taxonomic and geographic bias in the Living Planet Index by weighting species trends according to estimated species richness across realms and taxa. It estimates a 58% global vertebrate population decline from 1970 to 2012, compared with 20% under the unweighted LPI.

Key findings

  • The global LPI-D declined by 58% (95% CI: -48.3 to -66.0) between 1970 and 2012, an average annual decline of 2%, versus a 19.7% decline (95% CI: -6.6 to -30.9) and 0.52% annual decline for the unweighted LPI-U.
  • System-level LPI-D declines were 81.5% for freshwater (95% CI: -68.5 to -89.3), 35.6% for marine (95% CI: -19.5 to -48.8), and 37.9% for terrestrial (95% CI: -20.4 to -51.5); Table 1 gives LPI-U 2012 index values of 0.544 for freshwater, 1.125 for marine, and 0.848 for terrestrial.
  • For the Palearctic realm, LPI-U showed a 38.4% increase (95% CI: 12.7–66.2), while LPI-D showed a 30.3% decline (95% CI: -1.4 to -50.2).
  • The database contained 14,152 populations of 3,706 species from 3,095 data sources; representation was biased toward temperate birds and mammals, with under-representation of most tropical realms and marine fishes, and Afrotropical herps representing less than 1% of known species.

Methods

  • Data came from the Living Planet Database: time series of population size, density, abundance, or abundance proxies for vertebrate species from 1970 to 2012, requiring at least two years of data, consistent methods, and traceable sources.
  • The LPI-D weighted trends by estimated known species richness across systems, biogeographic realms, and taxonomic groups (birds, mammals, fish, and combined herps), producing 57 subsets; systems were weighted equally, realms were weighted by species proportions within systems, and taxa were weighted by species proportions within realms.
  • Population trends were modeled with Generalized Additive Models for series with six or more data points and the chain method otherwise; population lambdas were averaged to species trends, and 95% confidence intervals were generated with 10,000 bootstrap iterations. Binomial tests assessed taxonomic over- or under-representation.

Limitations

  • Stated: the approach relies on reasonable species lists, which change over time and may be lower quality for less studied groups and regions; estimates of undescribed species (57% amphibians, 13% reptiles, 22% fish) suggest these groups could receive even greater weight and that declines may be steeper than estimated.
  • Stated: LPI-D addresses broad geographic bias but not smaller-scale coverage gaps, such as Palearctic data being largely from Europe, Afrotropical data being better represented in eastern and southern Africa, and marine data clustering near coasts.
  • Stated and evident: manual data entry is a critical limitation for growing the database; some abundance records are confidential and cannot be made publicly available, and incomplete IUCN assessments for fishes (745 of 1,369 species unassessed, plus 40 Data Deficient) limit the threatened-species representation analysis.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1371/journal.pone.0169156

Cites

37 of 37 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 37 cited sources checked · 0 supported · 0 flagged

Show all 65 claims

  • It may state two separate claims as one. 42
  • Probably not a substantial claim. 18
52 of 52
  • The authors state this as an assumption.

    Protection has a positive effect on population trends.

    “on the assumption that protection has a positive effect on population trends.”
1 of 1

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Abstract reverses the unweighted terrestrial trend

    Major

    The abstract reports a 15% increase for the unweighted terrestrial index, but Table 1 gives its 2012 value as 0.848 relative to a 1970 baseline of 1-a decline of about 15%.

  • Marine group with zero representation contradicts removal rationale

    Minor

    The paper identifies a marine reptile group with 0% representation, then says no marine groups have less than 1% representation.

2 of 2

Citations

Cites

Flagged first, then by citations

Show all 37 references

Cited by

Sorted by citations

Items 201–236 of 236

Metadata

Authors
McRae, L., Deinet, S., & Freeman, R.
Affiliations
Zoological Society of London (GB)
Corresponding author
McRae, Louise
Venue
PLOS ONE
Published
2017-01-03
Volume
12
Issue
1
Pages
e0169156
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2493835817
Cited by
236
References
37
Citations by year
2026: 13 · 2025: 26 · 2024: 22 · 2023: 42 · 2022: 42 · 2021: 22 · 2020: 36 · 2019: 15 · 2018: 13 · 2017: 5
FWCI
15.55
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
WWF International
Topics
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ecology and Vegetation Dynamics Studies
  • Physical Sciences › Environmental Science › Ecology › Wildlife Ecology and Conservation
  • Physical Sciences › Environmental Science › Global and Planetary Change › Conservation, Biodiversity, and Resource Management
Keywords
Living Planet Index, biodiversity indicators, taxonomic bias, geographic bias, vertebrates, freshwater biodiversity, marine biodiversity, terrestrial biodiversity, biogeographical realms, data coverage, biodiversity monitoring
MeSH terms
Animals, Conservation of Natural Resources, Fresh Water, Geography, International Cooperation, Marine Biology, Science, Species Specificity, Time Factors, Vertebrates, Databases, Factual, Ecosystem, Earth, Planet, Biodiversity

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

A language model drew the claims from the paper on 2026-10-07, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).

A second model labelled each claim on 2026-10-07 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review