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Insulin imports fail to meet many countries' needs 期刊论文
Science, 2021
作者:  Abhishek Sharma;  Warren A. Kaplan
收藏  |  浏览/下载:16/0  |  提交时间:2021/08/10
Using DNA to reunify separated migrant families 期刊论文
Science, 2021
作者:  Elizabeth Barnert;  Sara H. Katsanis;  Ranit Mishori;  Jennifer K. Wagner;  Richard F. Selden;  Diana Madden;  Dan Berger;  Henry Erlich;  Kathryn Hampton;  Andreas Kleiser;  Alessandra La Vaccara;  Thomas J. Parsons;  Fredy A. Peccerelli;  Mariana Herrera Piñero;  Michael J. Stebbins;  Patricia Vásquez;  Curren W. Warf;  Thomas J. White;  Eric Stover;  M. Veronica Svetaz
收藏  |  浏览/下载:16/0  |  提交时间:2021/06/15
The impact of early childhood interventions on mothers 期刊论文
Science, 2021
作者:  David K. Evans;  Pamela Jakiela;  Heather A. Knauer
收藏  |  浏览/下载:39/0  |  提交时间:2021/06/07
Decadal Disruption of the QBO by Tropical Volcanic Supereruptions 期刊论文
Geophysical Research Letters, 2021
作者:  Hans Brenna;  Steffen Kutterolf;  Michael J. Mills;  Ulrike Niemeier;  Claudia Timmreck;  Kirstin Krü;  ger
收藏  |  浏览/下载:10/0  |  提交时间:2021/02/17
Illicit Drivers of Land Use Change: Narcotrafficking and Forest Loss in Central America 期刊论文
Global Environmental Change-Human and Policy Dimensions, 2020
作者:  Beth Tellman, Steven E. Sesnie, Nicholas R. Magliocca, Erik A. Nielsen, ... Bernardo Aguilar-Gonzalez
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/29
The impacts of cocaine-trafficking on conservation governance in Central America 期刊论文
Global Environmental Change-Human and Policy Dimensions, 2020
作者:  David J. Wrathall, Jennifer Devine, Bernardo Aguilar González, Karina Benessaiah, ... Anayansi Dávila
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/29
Monumental architecture at Aguada Fenix and the rise of Maya civilization 期刊论文
NATURE, 2020
作者:  Bedding, Timothy R.;  Murphy, Simon J.;  Hey, Daniel R.;  Huber, Daniel;  Li, Tanda;  Smalley, Barry;  Stello, Dennis;  White, Timothy R.;  Ball, Warrick H.;  Chaplin, William J.;  Colman, Isabel L.;  Fuller, Jim;  Gaidos, Eric;  Harbeck, Daniel R.;  Hermes, J. J.;  Holdsworth, Daniel L.;  Li, Gang;  Li, Yaguang;  Mann, Andrew W.;  Reese, Daniel R.;  Sekaran, Sanjay;  Yu, Jie;  Antoci, Victoria;  Bergmann, Christoph;  Brown, Timothy M.;  Howard, Andrew W.;  Ireland, Michael J.;  Isaacson, Howard;  Jenkins, Jon M.;  Kjeldsen, Hans;  McCully, Curtis;  Rabus, Markus;  Rains, Adam D.;  Ricker, George R.;  Tinney, Christopher G.;  Vanderspek, Roland K.
收藏  |  浏览/下载:30/0  |  提交时间:2020/07/03

Archaeologists have traditionally thought that the development of Maya civilization was gradual, assuming that small villages began to emerge during the Middle Preclassic period (1000-350 bc  dates are calibrated throughout) along with the use of ceramics and the adoption of sedentism(1). Recent finds of early ceremonial complexes are beginning to challenge this model. Here we describe an airborne lidar survey and excavations of the previously unknown site of Aguada Fenix (Tabasco, Mexico) with an artificial plateau, which measures 1,400 m in length and 10 to 15 m in height and has 9 causeways radiating out from it. We dated this construction to between 1000 and 800 bc using a Bayesian analysis of radiocarbon dates. To our knowledge, this is the oldest monumental construction ever found in the Maya area and the largest in the entire pre-Hispanic history of the region. Although the site exhibits some similarities to the earlier Olmec centre of San Lorenzo, the community of Aguada Fenix probably did not have marked social inequality comparable to that of San Lorenzo. Aguada Fenix and other ceremonial complexes of the same period suggest the importance of communal work in the initial development of Maya civilization.


Lidar survey of the Maya lowlands uncovers the monumental site of Aguada Fenix, which dates to around 1000-800 bc and points to the role of communal construction in the development of Maya civilization.


  
Ancient lowland Maya complexity as revealed by airborne laser scanning of northern Guatemala 期刊论文
SCIENCE, 2018, 361 (6409) : 1355-+
作者:  Canuto, Marcello A.;  Estrada-Belli, Francisco;  Garrison, Thomas G.;  Houston, Stephen D.;  Acuna, Mary Jane;  Kovac, Milan;  Marken, Damien;  Nondedeo, Philippe;  Auld-Thomas, Luke;  Castanet, Cyril;  Chatelain, David;  Chiriboga, Carlos R.;  Drapela, Tomas;  Lieskovsky, Tibor;  Tokovinine, Alexandre;  Velasquez, Antolin;  Fernandez-Diaz, Juan C.;  Shrestha, Ramesh
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
A long-term decrease in the persistence of soil carbon caused by ancient Maya land use 期刊论文
NATURE GEOSCIENCE, 2018, 11 (9) : 645-+
作者:  Douglas, Peter M. J.;  Pagani, Mark;  Eglinton, Timothy I.;  Brenner, Mark;  Curtis, Jason H.;  Breckenridge, Andy;  Johnston, Kevin
收藏  |  浏览/下载:11/0  |  提交时间:2019/04/09
Institutional legacies explain the comparative efficacy of protected areas: Evidence from the Calakmul and Maya Biosphere Reserves of Mexico and Guatemala 期刊论文
GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS, 2018, 50: 278-288
作者:  Solorzano, Claudia Rodriguez;  Fleischman, Forrest
收藏  |  浏览/下载:3/0  |  提交时间:2019/04/09
Protected areas  Conservation  Governance  Institutions  Mexico  Guatemala