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 547 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	98	18%
United Kingdom	56	10%
Australia	26	5%
Canada	21	4%
Spain	16	3%
Germany	8	1%
Mexico	7	1%
Sweden	6	1%
Colombia	6	1%
Other	87	16%
Unknown	216	39%

Demographic breakdown

Type	Count	As %
Members of the public	386	71%
Scientists	138	25%
Science communicators (journalists, bloggers, editors)	19	3%
Practitioners (doctors, other healthcare professionals)	3	<1%
Unknown	1	<1%

Mendeley readers

The data shown below were compiled from readership statistics for 4,129 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country	Count	As %
Brazil	46	1%
United States	37	<1%
United Kingdom	18	<1%
Mexico	11	<1%
Canada	8	<1%
Chile	7	<1%
Germany	7	<1%
Portugal	7	<1%
Australia	7	<1%
Other	66	2%
Unknown	3915	95%

Demographic breakdown

Readers by professional status	Count	As %
Student > Master	771	19%
Student > Ph. D. Student	768	19%
Student > Bachelor	673	16%
Researcher	599	15%
Student > Doctoral Student	205	5%
Other	654	16%
Unknown	459	11%

Readers by discipline	Count	As %
Agricultural and Biological Sciences	1877	45%
Environmental Science	1008	24%
Earth and Planetary Sciences	123	3%
Biochemistry, Genetics and Molecular Biology	120	3%
Social Sciences	89	2%
Other	286	7%
Unknown	626	15%

Attention Score in Context

This research output has an Altmetric Attention Score of 1839. 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 01 February 2021.

All research outputs

#2,668

of 17,732,250 outputs

Outputs from Science

#185

of 70,938 outputs

Outputs of similar age

#20

of 201,019 outputs

Outputs of similar age from Science

of 891 outputs

Altmetric has tracked 17,732,250 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 70,938 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 55.8. 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 201,019 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 891 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