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 559 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	105	19%
United Kingdom	63	11%
Australia	29	5%
Canada	25	4%
Spain	12	2%
Mexico	7	1%
Sweden	6	1%
Germany	6	1%
India	5	<1%
Other	80	14%
Unknown	221	40%

Demographic breakdown

Type	Count	As %
Members of the public	397	71%
Scientists	135	24%
Science communicators (journalists, bloggers, editors)	23	4%
Practitioners (doctors, other healthcare professionals)	3	<1%
Unknown	1	<1%

Mendeley readers

The data shown below were compiled from readership statistics for 2,979 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country	Count	As %
Brazil	49	2%
United States	39	1%
United Kingdom	18	<1%
Mexico	11	<1%
Australia	8	<1%
Canada	8	<1%
Chile	7	<1%
Germany	7	<1%
Switzerland	7	<1%
Other	69	2%
Unknown	2756	93%

Demographic breakdown

Readers by professional status	Count	As %
Student > Ph. D. Student	605	20%
Student > Master	565	19%
Researcher	480	16%
Student > Bachelor	453	15%
Unspecified	247	8%
Other	629	21%

Readers by discipline	Count	As %
Agricultural and Biological Sciences	1505	51%
Environmental Science	752	25%
Unspecified	358	12%
Earth and Planetary Sciences	88	3%
Biochemistry, Genetics and Molecular Biology	77	3%
Other	199	7%

Attention Score in Context

This research output has an Altmetric Attention Score of 1777. 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 15 October 2019.

All research outputs

#1,089

of 13,645,026 outputs

Outputs from Science

#93

of 62,801 outputs

Outputs of similar age

#18

of 192,321 outputs

Outputs of similar age from Science

of 900 outputs

Altmetric has tracked 13,645,026 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 62,801 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 44.8. This one has done particularly well, scoring higher than 99% of its peers.

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We're also able to compare this research output to 900 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

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Attention Score in Context