Evidence map›Paper›PMID 32822346›Full record

ArticlePloS one2020

Global extent and drivers of mammal population declines in protected areas under illegal hunting pressure.

Alfan A Rija, Rob Critchlow, Chris D Thomas, Colin M Beale

Abstract read
In one paragraph

Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed.

  1. Article
  2. Prevalence of traded bird species in key biodiversity areas.Conservation biology : the journal of the Society for Conservation Biology · 2026
    Article
  3. Use of species' responses to cryptic anthropogenic disturbances for monitoring biodiversity outcomes in tropical forests.Conservation biology : the journal of the Society for Conservation Biology · 2026
    Article
  4. Article
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  6. Article
  7. Article
  8. Article
  9. Chimpanzees (Ecology and evolution · 2025
    Article
  10. Article
  11. Article
  12. Article
  13. Economic Valuation of Balkan Chamois Conservation.Animals : an open access journal from MDPI · 2023
    Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Alfan A RijaDepartment of Wildlife Management, Sokoine University of Agriculture, Morogoro, Tanzania.ORCID 0000-0001-7386-8124
Rob CritchlowDepartment of Biology, University of York, York, United Kingdom.ORCID 0000-0003-4524-1417
Chris D ThomasDepartment of Biology, University of York, York, United Kingdom.
Colin M BealeDepartment of Biology, University of York, York, United Kingdom.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Illegal hunting is a persistent problem in many protected areas, but an overview of the extent of this problem and its impact on wildlife is lacking. We reviewed 40 years (1980-2020) of global research to examine the spatial distribution of research and socio-ecological factors influencing population decline within protected areas under illegal hunting pressure. From 81 papers reporting 988 species/site combinations, 294 mammal species were reported to have been illegally hunted from 155 protected areas across 48 countries. Research in illegal hunting has increased substantially during the review period and showed biases towards strictly protected areas and the African continent. Population declines were most frequent in countries with a low human development index, particularly in strict protected areas and for species with a body mass over 100 kg. Our results provide evidence that illegal hunting is most likely to cause declines of large-bodied species in protected areas of resource-poor countries regardless of protected area conservation status. Given the growing pressures of illegal hunting, increased investments in people's development and additional conservation efforts such as improving anti-poaching strategies and conservation resources in terms of improving funding and personnel directed at this problem are a growing priority.

Indexed as

InternationalityMammalsAnimalsConservation of Natural ResourcesPopulation Dynamics

Identifiers

PMID32822346
PMCPMC7446782

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.