A5101403515- Archaeology and Natural History
- Archaeology and ancient environmental studies
- Botany, Ecology, and Taxonomy Studies
- Pleistocene-Era Hominins and Archaeology
- Rangeland and Wildlife Management
- Geology and Paleoclimatology Research
- Evolution and Paleontology Studies
- Wildlife Ecology and Conservation
- Archaeological Research and Protection
- American Environmental and Regional History
- Environmental and Cultural Studies in Latin America and Beyond
- Classical Antiquity Studies
- Species Distribution and Climate Change
- Historical and Cultural Archaeology Studies
- Energy and Environment Impacts
- Pacific and Southeast Asian Studies
- Air Quality and Health Impacts
- Artificial Intelligence in Games
- Humor Studies and Applications
- Animal Ecology and Behavior Studies
- Digital Games and Media
- Energy, Environment, and Transportation Policies
- Gender, Feminism, and Media
- Digital Humanities and Scholarship
- Ecology and Vegetation Dynamics Studies
University of Bristol
2018-2024
University of Exeter
2016
World Bank
2015
Natural History Museum
1954-2010
University of Arizona
1990-2007
Vernon College
1975
Central Arizona College
1975
University of Massachusetts Boston
1972
Field Museum of Natural History
1939-1970
German Oceanographic Museum
1965
Frugivory by extinct horses, gomphotheres, ground sloths, and other Pleistocene megafauna offers a key to understanding certain plant reproductive traits in Central American lowland forests. When over 15 genera of large herbivores became roughly 10,000 years ago, seed dispersal subsequent distributions many species were altered. Introduction horses cattle may have part restored the local ranges such trees as jicaro (Crescentia alata) guanacaste (Enterolobium cyclocarpum) that had mammals...
I propose a new scenario for the discovery of America. By analogy with other successful animal invasions, one may assume that New World triggered human population explosion. The invading hunters attained their highest density along front swept from Canada to Gulf Mexico in 350 years, and on tip South America roughly 1000 years. A sharp drop soon followed as major prey animals declined extinction. Possible values model include an average frontal depth 160 kilometers, 0.4 person per square...
Abstract DNA was extracted from five coprolites, excavated in Gypsum Cave, Nevada and radiocarbon dated to approximately 11 000, 20 000 28 500 years bp. All coprolites contained mitochondrial sequences identical a sequence determined bone of the extinct ground sloth Nothrotheriops shastensis . A 157‐bp fragment chloroplast gene for large subunit ribulosebisphosphate carboxylase ( rbcL ) amplified boluses several hundred clones were sequenced. In addition, same sequenced 99 plant species that...
The journals of Lewis and Clark reveal a major difference in the taxa, numbers, behavior megafauna on either side Rocky Mountains western North America. Two prior events set stage for what would find. first was extinction around 13,000 years ago two‐thirds native American West. second effects Indians deadly new diseases technologies brought by Europeans post‐Columbian era. Populations large animals, which were preferred prey people, not immune to European influence. Along Columbia River...
Excavations at Snaketown. Volume I, Material Culture, Harold S. Gladwin, Emil W. Haury, E. B. Sayles, and Nora Gladwin. Medallion Papers, No. XXV. - II, Comparisons Theories by papers, XXVI, Privately printed for Gila Pueblo, Globe, Arizona, December, 1937. 5 Issue 2
Organic remains, especially dung, of extinct ground sloths provide ideal material for radiocarbon dating. Rampart Cave, Arizona, revealed periodic occupation at intervals by the Shasta sloth from before 40,000 years ago until 11,000 ago. Dates other caves in arid Southwest indicate that disappeared very soon after time Clovis big game hunters. Ground remains South America are slightly younger. The timing extinction is accord with model explosive overkill.
The discovery of a unique organic deposit in dry cave on the Colorado Plateau, southern Utah, permits first comparison physical characteristics and diet dung extinct mammoths from arid Southwest, North America, with that Siberia northern China, only other known locations such remains. buried beneath sand rockfall is composed primarily mammoth dung, estimated at over 300 m 3 . Radiocarbon dates boluses indicate frequented between approximately 14,700 11,000 yr B.P. (the range ages 2σ)....
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Abstract MicroLEDs will transform the display industry in both sparse displays and microdisplays.