Evidence map›Paper›PMID 33859376›Full record

SynthesisNature ecology & evolution2021

The island rule explains consistent patterns of body size evolution in terrestrial vertebrates.

Ana Benítez-López, Luca Santini, Juan Gallego-Zamorano, Borja Milá, Patrick Walkden, Mark A J Huijbregts, Joseph A Tobias

Open access · bronzeAbstract readMeta-Analysis
PubMed Publisher
In one paragraph

Synthesis in Nature ecology & evolution, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 59 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
59citing papers in PubMed, 1 pooled it
57.4field-weighted citation impact, top 1% of its field
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

59 citing papers in PubMed, 1 synthesis or guideline pooled it, 169 citations in OpenAlex.

  1. Pooled it
  2. Review
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  4. Homo luzonensis and the role of homoplasy in the morphology of hominin insular species.Cladistics : the international journal of the Willi Hennig Society · 2026
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  17. Virtual endocast of the Late MioceneProceedings. Biological sciences · 2025
    Article
  18. Phenotypic and developmental dissection of an instance of the island rule.Evolution; international journal of organic evolution · 2025
    Article
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  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

7 authors at 3 institutions in 4 countries.

Ana Benítez-LópezDepartment of Environmental Science, Institute for Wetland and Water Research, Radboud University, Nijmegen, The Netherlands. ana.benitez@ebd.csic.es.ORCID http://orcid.org/0000-0002-6432-1837
Luca SantiniDepartment of Environmental Science, Institute for Wetland and Water Research, Radboud University, Nijmegen, The Netherlands.ORCID http://orcid.org/0000-0002-5418-3688
Juan Gallego-ZamoranoDepartment of Environmental Science, Institute for Wetland and Water Research, Radboud University, Nijmegen, The Netherlands.ORCID http://orcid.org/0000-0003-2317-5148
Borja MiláDepartment of Biodiversity and Evolutionary Biology, National Museum of Natural Sciences, Spanish National Research Council (CSIC), Madrid, Spain.ORCID http://orcid.org/0000-0002-6446-0079
Patrick WalkdenDepartment of Life Sciences, Imperial College London, Ascot, UK.
Mark A J Huijbregts *Department of Environmental Science, Institute for Wetland and Water Research, Radboud University, Nijmegen, The Netherlands.ORCID http://orcid.org/0000-0002-7037-680X
Joseph A Tobias *Department of Life Sciences, Imperial College London, Ascot, UK.ORCID http://orcid.org/0000-0003-2429-6179
Radboud University Nijmegen · NLImperial College London · GBConsejo Superior de Investigaciones Científicas · ES

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Island faunas can be characterized by gigantism in small animals and dwarfism in large animals, but the extent to which this so-called 'island rule' provides a general explanation for evolutionary trajectories on islands remains contentious. Here we use a phylogenetic meta-analysis to assess patterns and drivers of body size evolution across a global sample of paired island-mainland populations of terrestrial vertebrates. We show that 'island rule' effects are widespread in mammals, birds and reptiles, but less evident in amphibians, which mostly tend towards gigantism. We also found that the magnitude of insular dwarfism and gigantism is mediated by climate as well as island size and isolation, with more pronounced effects in smaller, more remote islands for mammals and reptiles. We conclude that the island rule is pervasive across vertebrates, but that the implications for body size evolution are nuanced and depend on an array of context-dependent ecological pressures and environmental conditions.

Indexed as

Biological EvolutionMammalsAnimalsBirdsBody SizePhylogeny

Identifiers

PMID33859376
OpenAlexW3153779571

What Socratic holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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 Socratic graph.