Evidence map›Paper›PMID 34073133›Full record

ArticleCells2021

Longer Sperm Swim More Slowly in the Canary Islands Chiffchaff.

Emily R A Cramer, Eduardo Garcia-Del-Rey, Lars Erik Johannessen, Terje Laskemoen, Gunnhild Marthinsen, Arild Johnsen, Jan T Lifjeld

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Cells, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing 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

7 citing papers in PubMed.

  1. Effects of genotypes on sperm quality and fertility of buffalo bulls.Journal of advanced veterinary and animal research · 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

7 authors.

Emily R A CramerSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.
Eduardo Garcia-Del-ReyMacaronesian Institute of Field Ornithology, 38001 Santa Cruz de Tenerife, Canary Islands, Spain.
Lars Erik JohannessenSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.
Terje LaskemoenSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.
Gunnhild MarthinsenSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.
Arild JohnsenSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.
Jan T LifjeldSex and Evolution Research Group, Natural History Museum, University of Oslo, 0318 Oslo, Norway.ORCID 0000-0002-9172-9985

Funding

Norges Forskningsråd 196554Norges Forskningsråd 301592
6 · The paper itself

Abstract

Sperm swimming performance affects male fertilization success, particularly in species with high sperm competition. Understanding how sperm morphology impacts swimming performance is therefore important. Sperm swimming speed is hypothesized to increase with total sperm length, relative flagellum length (with the flagellum generating forward thrust), and relative midpiece length (as the midpiece contains the mitochondria). We tested these hypotheses and tested for divergence in sperm traits in five island populations of Canary Islands chiffchaff (

Indexed as

PhenotypeAnimalsMaleMammalsPasseriformesPhylogenySpainSpermatozoaSperm Motilitychiffchaff species complexMacaronesiasperm morphologysperm motilitysperm velocity

Identifiers

PMID34073133
PMCPMC8228216

What OpenQuestion holds

Textmetadata
LicenceCC BY
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 OpenQuestion graph.