Evidence map›Paper›PMID 33268368›Full record

ArticleScience advances2020

Anthropogenic extinctions conceal widespread evolution of flightlessness in birds.

F Sayol, M J Steinbauer, T M Blackburn, A Antonelli, S Faurby

Abstract read
In one paragraph

Article in Science advances, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 1 pooled it
–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

22 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. A transition toward flightlessness in Mallards, Indian Runner Ducks, and their hybrid offspring.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  4. Review
  5. Article
  6. Article
  7. Species introductions shift seed dispersal potential more than extinctions across 120 island plant-frugivore communities.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  8. Review
  9. Review
  10. Article
  11. Conservation priorities for functionally unique and specialized terrestrial vertebrates threatened by biological invasions.Conservation biology : the journal of the Society for Conservation Biology · 2025
    Article
  12. Structure and function of the avian respiratory system.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  13. Article
  14. Article
  15. Article
  16. Article
  17. The evolution of insular woodiness.Proceedings of the National Academy of Sciences of the United States of America · 2022
    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

5 authors.

F SayolDepartment of Biological and Environmental Sciences, University of Gothenburg, Göteborg, Sweden. f.sayol@ucl.ac.uk.ORCID 0000-0003-3540-7487
M J SteinbauerUniversity of Bayreuth, Bayreuth Center of Ecology and Environmental Research (BayCEER) & Department of Sport Science, Bayreuth, Germany.ORCID 0000-0002-7142-9272
T M BlackburnCentre for Biodiversity and Environmental Research, University College London, London, UK.ORCID 0000-0003-0152-2663
A AntonelliDepartment of Biological and Environmental Sciences, University of Gothenburg, Göteborg, Sweden.ORCID 0000-0003-1842-9297
S FaurbyDepartment of Biological and Environmental Sciences, University of Gothenburg, Göteborg, Sweden.ORCID 0000-0002-2974-2628

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Human-driven extinctions can affect our understanding of evolution, through the nonrandom loss of certain types of species. Here, we explore how knowledge of a major evolutionary transition-the evolution of flightlessness in birds-is biased by anthropogenic extinctions. Adding data on 581 known anthropogenic extinctions to the extant global avifauna increases the number of species by 5%, but quadruples the number of flightless species. The evolution of flightlessness in birds is a widespread phenomenon, occurring in more than half of bird orders and evolving independently at least 150 times. Thus, we estimate that this evolutionary transition occurred at a rate four times higher than it would appear based solely on extant species. Our analysis of preanthropogenic avian diversity shows how anthropogenic effects can conceal the frequency of major evolutionary transitions in life forms and highlights the fact that macroevolutionary studies with only small amounts of missing data can still be highly biased.

Identifiers

PMID33268368
PMCPMC7710364

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.