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Sperm number trumps sperm size in mammalian ejaculate evolution

Overview of attention for article published in Proceedings of the Royal Society B: Biological Sciences, November 2015
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (97th percentile)

Mentioned by

news
24 news outlets
blogs
4 blogs
twitter
20 tweeters
facebook
1 Facebook page
googleplus
4 Google+ users
video
1 video uploader

Citations

dimensions_citation
17 Dimensions

Readers on

mendeley
50 Mendeley
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Title
Sperm number trumps sperm size in mammalian ejaculate evolution
Published in
Proceedings of the Royal Society B: Biological Sciences, November 2015
DOI 10.1098/rspb.2015.2122
Pubmed ID
Authors

Stefan Lüpold, John L. Fitzpatrick

Abstract

Postcopulatory sexual selection is widely accepted to underlie the extraordinary diversification of sperm morphology. However, why does it favour longer sperm in some taxa but shorter in others? Two recent hypotheses addressing this discrepancy offered contradictory explanations. Under the sperm dilution hypothesis, selection via sperm density in the female reproductive tract favours more but smaller sperm in large, but the reverse in small, species. Conversely, the metabolic constraint hypothesis maintains that ejaculates respond positively to selection in small endothermic animals with high metabolic rates, whereas low metabolic rates constrain their evolution in large species. Here, we resolve this debate by capitalizing on the substantial variation in mammalian body size and reproductive physiology. Evolutionary responses shifted from sperm length to number with increasing mammalian body size, thus supporting the sperm dilution hypothesis. Our findings demonstrate that body-size-mediated trade-offs between sperm size and number can explain the extreme diversification in sperm phenotypes.

Twitter Demographics

The data shown below were collected from the profiles of 20 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 50 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Switzerland 2 4%
United States 1 2%
Sweden 1 2%
Unknown 46 92%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 18 36%
Researcher 8 16%
Student > Bachelor 7 14%
Student > Master 7 14%
Unspecified 3 6%
Other 7 14%
Readers by discipline Count As %
Agricultural and Biological Sciences 35 70%
Unspecified 8 16%
Biochemistry, Genetics and Molecular Biology 4 8%
Physics and Astronomy 1 2%
Social Sciences 1 2%
Other 1 2%

Attention Score in Context

This research output has an Altmetric Attention Score of 233. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 16 December 2017.
All research outputs
#57,009
of 13,906,046 outputs
Outputs from Proceedings of the Royal Society B: Biological Sciences
#134
of 7,680 outputs
Outputs of similar age
#1,848
of 358,931 outputs
Outputs of similar age from Proceedings of the Royal Society B: Biological Sciences
#4
of 138 outputs
Altmetric has tracked 13,906,046 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 7,680 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 29.5. This one has done particularly well, scoring higher than 98% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 358,931 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 138 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 97% of its contemporaries.