Report for: Defaunation in the Anthropocene

Title	Defaunation in the Anthropocene
Published in	Science, July 2014
DOI	10.1126/science.1251817
Pubmed ID	25061202
Authors	R. Dirzo, H. S. Young, M. Galetti, G. Ceballos, N. J. B. Isaac, B. Collen
Abstract	We live amid a global wave of anthropogenically driven biodiversity loss: species and population extirpations and, critically, declines in local species abundance. Particularly, human impacts on animal biodiversity are an under-recognized form of global environmental change. Among terrestrial vertebrates, 322 species have become extinct since 1500, and populations of the remaining species show 25% average decline in abundance. Invertebrate patterns are equally dire: 67% of monitored populations show 45% mean abundance decline. Such animal declines will cascade onto ecosystem functioning and human well-being. Much remains unknown about this "Anthropocene defaunation"; these knowledge gaps hinder our capacity to predict and limit defaunation impacts. Clearly, however, defaunation is both a pervasive component of the planet's sixth mass extinction and also a major driver of global ecological change.

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Twitter Demographics

The data shown below were collected from the profiles of 544 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Geographical breakdown

Country	Count	As %
United States	100	18%
United Kingdom	60	11%
Australia	28	5%
Canada	22	4%
Spain	15	3%
Mexico	7	1%
Sweden	6	1%
Colombia	6	1%
India	5	<1%
Other	83	15%
Unknown	212	39%

Demographic breakdown

Type	Count	As %
Members of the public	380	70%
Scientists	139	26%
Science communicators (journalists, bloggers, editors)	21	4%
Practitioners (doctors, other healthcare professionals)	3	<1%
Unknown	1	<1%

Mendeley readers

The data shown below were compiled from readership statistics for 3,451 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country	Count	As %
Brazil	50	1%
United States	39	1%
United Kingdom	18	<1%
Mexico	11	<1%
Canada	8	<1%
Switzerland	7	<1%
Germany	7	<1%
Australia	7	<1%
Portugal	7	<1%
Other	70	2%
Unknown	3227	94%

Demographic breakdown

Readers by professional status	Count	As %
Student > Ph. D. Student	680	20%
Student > Master	647	19%
Student > Bachelor	541	16%
Researcher	532	15%
Student > Doctoral Student	166	5%
Other	571	17%
Unknown	314	9%

Readers by discipline	Count	As %
Agricultural and Biological Sciences	1653	48%
Environmental Science	867	25%
Earth and Planetary Sciences	102	3%
Biochemistry, Genetics and Molecular Biology	93	3%
Social Sciences	70	2%
Other	215	6%
Unknown	451	13%

Attention Score in Context

This research output has an Altmetric Attention Score of 1836. 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 22 May 2020.

All research outputs

#1,551

of 15,132,537 outputs

Outputs from Science

#124

of 65,773 outputs

Outputs of similar age

#19

of 194,384 outputs

Outputs of similar age from Science

of 899 outputs

Altmetric has tracked 15,132,537 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 65,773 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 49.1. This one has done particularly well, scoring higher than 99% 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 194,384 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 899 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 99% of its contemporaries.

Defaunation in the Anthropocene

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Geographical breakdown

Demographic breakdown

Mendeley readers

Geographical breakdown

Demographic breakdown

Attention Score in Context