Evidence map›Paper›PMID 33653097›Full record

ArticleBiology letters2021

Dark extinction: the problem of unknown historical extinctions.

Mannfred M A Boehm, Quentin C B Cronk

Abstract read
In one paragraph

Article in Biology letters, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing 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

25 citing papers in PubMed.

  1. Article
  2. Review
  3. Review
  4. Global biodiversity and the expanding Tree of Life.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  5. Article
  6. Museum genomics suggests long-term population decline in a putatively extinct bumble bee.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Zoofolkloristics: Imagination as a Critical Component.Animals : an open access journal from MDPI · 2024
    Article
  15. Article
  16. Article
  17. Review
  18. Cambridge prisms. Extinction · 2024
    Article
  19. Two centuries of biodiversity discovery and loss in Singapore.Proceedings of the National Academy of Sciences of the United States of America · 2023
    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

2 authors.

Mannfred M A BoehmDepartment of Botany, Beaty Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada V6T 1Z4.
Quentin C B CronkDepartment of Botany, Beaty Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada V6T 1Z4.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The extinction of species before they are discovered and named (dark extinction, DE) is widely inferred as a significant part of species loss in the 'pre-taxonomic' period (approx. 1500-1800 CE) and, to some extent, in the 'taxonomic period' (approx. 1800-present) as well. The discovery of oceanic islands and other pristine habitats by European navigators and the consequent introduction of destructive mammals, such as rats and goats, started a process of anthropogenic extinction. Much ecosystem change happened before systematic scientific recording, so has led to DE. Statistical methods are available to robustly estimate DE in the 'taxonomic period'. For the 'pre-taxonomic period', simple extrapolation can be used. The application of these techniques to world birds, for example, suggests that approximately 56 DEs occurred in the 'taxonomic period' (1800-present) and approximately 180 in the 'pre-taxonomic period' (1500-1800). Targeting collection activities in extinction hotspots, to make sure organisms are represented in collections before their extinction, is one way of reducing the number of extinct species without a physical record (providing that collection efforts do not themselves contribute to species extinction).

Indexed as

EcosystemExtinction, BiologicalAnimalsBirdsMammalsRatsdark extinctionextinction debtextinction rateisland extinctionoceanic islandSt Helena

Identifiers

PMID33653097
PMCPMC8086982

What OpenQuestion holds

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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.