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 557 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	103	18%
United Kingdom	64	11%
Australia	29	5%
Canada	25	4%
Spain	12	2%
Mexico	7	1%
India	7	1%
Sweden	6	1%
Germany	6	1%
Other	80	14%
Unknown	218	39%

Demographic breakdown

Type	Count	As %
Members of the public	395	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 2,930 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	12	<1%
Australia	8	<1%
Canada	8	<1%
Chile	7	<1%
Germany	7	<1%
Switzerland	7	<1%
Other	69	2%
Unknown	2706	92%

Demographic breakdown

Readers by professional status	Count	As %
Student > Ph. D. Student	606	21%
Student > Master	560	19%
Researcher	473	16%
Student > Bachelor	440	15%
Unspecified	229	8%
Other	622	21%

Readers by discipline	Count	As %
Agricultural and Biological Sciences	1491	51%
Environmental Science	746	25%
Unspecified	340	12%
Earth and Planetary Sciences	85	3%
Biochemistry, Genetics and Molecular Biology	73	2%
Other	195	7%

Attention Score in Context

This research output has an Altmetric Attention Score of 1758. 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 14 September 2019.

All research outputs

#1,083

of 13,533,438 outputs

Outputs from Science

#93

of 62,444 outputs

Outputs of similar age

#18

of 192,265 outputs

Outputs of similar age from Science

of 900 outputs

Altmetric has tracked 13,533,438 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 62,444 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 44.5. 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 192,265 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 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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Demographic breakdown

Mendeley readers

Geographical breakdown

Demographic breakdown

Attention Score in Context