Evidence map›Paper›PMID 35379937›Full record

ArticleNature ecology & evolution2022

Latitudinal gradients in avian colourfulness.

Christopher R Cooney, Yichen He, Zoë K Varley, Lara O Nouri, Christopher J A Moody, Michael D Jardine, András Liker, Tamás Székely, Gavin H Thomas

Abstract read
PubMed Publisher
In one paragraph

Article in Nature ecology & evolution, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
28citing 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

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

  1. Pooled it
  2. The link between colorfulness and extinction risk across the world's passerine birds.Conservation biology : the journal of the Society for Conservation Biology · 2026
    Article
  3. Article
  4. Bird Community Colours Across Different Types of Habitat.Animals : an open access journal from MDPI · 2026
    Article
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  14. PeerJ · 2025
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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

9 authors.

Christopher R CooneyEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK. c.cooney@sheffield.ac.uk.ORCID http://orcid.org/0000-0002-4872-9146
Yichen HeEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.ORCID http://orcid.org/0000-0003-3464-7526
Zoë K VarleyEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.
Lara O NouriEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.ORCID http://orcid.org/0000-0003-0397-8699
Christopher J A MoodyEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.
Michael D JardineEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.
András LikerMTA-PE Evolutionary Ecology Research Group, University of Pannonia, Veszprém, Hungary.
Tamás SzékelyMilner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath, UK.ORCID http://orcid.org/0000-0003-2093-0056
Gavin H ThomasEcology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield, UK.ORCID http://orcid.org/0000-0002-1982-6051

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

It has long been suggested that tropical species are generally more colourful than temperate species, but whether latitudinal gradients in organismal colourfulness exist remains controversial. Here we quantify global latitudinal trends in colourfulness (within-individual colour diversity) by collating and analysing a photographic dataset of whole-body plumage reflectance information for >4,500 species of passerine birds. We show that male and female birds of tropical passerine species are generally more colourful than their temperate counterparts, both on average and in the extreme. We also show that these geographic gradients can be explained in part by the effects of several latitude-related factors related to classic hypotheses for climatic and ecological determinants of organismal colourfulness. Taken together, our results reveal that species' colourfulness peaks in the tropics for passerine birds, confirming the existence of a long-suspected yet hitherto elusive trend in the distribution of global biodiversity.

Indexed as

BiodiversityFemaleHumansMale

Identifiers

PMID35379937

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.