EMBARGOED—NOT FOR PUBLIC RELEASE BEFORE:
Monday, June 1, 2015
 3:00 PM US Eastern Daylight Time
 7:00 PM Greenwich Mean Time
Tuesday, June 2, 2015
 4:00 AM Japanese Standard Time
 6:00 AM Australian Eastern Time
The full PNAS embargo policy is available here:
http://www.pnas.org/site/misc/journalist.shtml
Complete list of articles expected to publish in PNAS the week of June 1:
<http://www.eurekalert.org/jrnls/pnas/subject.htm>
IMPORTANT NOTE: The articles listed below will publish on Monday, June 1, 2015.
All other articles will publish throughout the week as soon as final corrections are
made; therefore, the exact date of publication is not scheduled in advance. Please
note that the DOI link of each PNAS article will not go live until the paper has
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If you need assistance, please contact PNAS Media Coordinator Luwam Yeibio at the
PNAS News Office at PNASnews@nas.edu or 202-334-1310.

Estimating tropical tree species richness
Using a database of old-growth, closed-canopy tropical forest tree species abundances
covering more than 657,000 trees of 11,371 species, researchers estimate that the minimum
number of tropical tree species likely ranges between approximately 40,000 and 53,000, and
that the Indo-Pacific region is as rich in tree species as tropical America, in contrast to
continental Africa, which has fewer tree species.
Article #14-23147: “An estimate of the number of tropical tree species,” J.W. Ferry Slik et al.
MEDIA CONTACT: J.W. Ferry Slik, Faculty of Science, University of Brunei Darrusalam,
BRUNEI DARRUSALAM; tel: +6737142860; e-mail: <ferryslik@hotmail.com>
http://www.eurekalert.org/jrnls/pnas/14-23147.htm