Julio Betancourt
Biographic Data
| ID | 10483588 |
|---|---|
| NAME | Julio Betancourt |
| GIVEN NAMES | Julio |
| FAMILY NAME | Betancourt |
| SIGNATURE | BETANCOURT J |
| AFFILIATIONS | United States Geological Survey |
| VERIFIED | No |
| TOTAL WORKS | 5 |
| TOTAL CITATIONS | 0 |
| WORKS AS AUTHOR | 5 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1997 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 0 |
A 40,000-year packrat midden series from Cataviña, central Baja California, Mexico
Thirty packrat ( Neotoma spp.) middens collected from boulder fields near Cataviña, Baja California, Mexico, at 640–680 m elevation provide the first long chronology of macrofossils and pollen spanning the late Quaternary in the Central Desert of Baja California. Midden plant macrofossil and pollen assemblages document a rich chaparral/woodland assemblage during the last glacial and early Holocene dominated by Parry pinyon ( Pinus quadrifolia ) a…
Unfamiliar Territory
Novel forms of drought are emerging globally, due to climate change, shifting teleconnection patterns, expanding human water use, and a history of human influence on the environment that increases the probability of transformational ecological impacts. These costly ecological impacts cascade to human communities, and understanding this changing drought landscape is one of today's grand challenges. By using a modified horizon-scanning approach tha…
Stationarity Is Dead
Climate change undermines a basic assumption that historically has facilitated management of water supplies, demands, and risks.
Late Pleistocene C 4 Plant Dominance and Summer Rainfall in the Southwestern United States from Isotopic Study of Herbivore Teeth
Patterns of climate and C 4 plant abundance in the southwestern United States during the last glaciation were evaluated from isotopic study of herbivore tooth enamel. Enamel δ 13 C values revealed a substantial eastward increase in C 4 plant consumption for Mammuthus spp., Bison spp., Equus spp., and Camelops spp. The δ 13 C values were greatest in Bison spp. (−6.9 to +1.7‰) and Mammuthus spp. (−9.0 to +0.3‰), and in some locales indicated C 4 -d…
Late-Holocene rodent middens from Rio Limay, Neuquen Province, Argentina
Pollen analysis of late-Holocene amberat deposits from two caves near the forest-steppe ecotone in northern Patagonia documents a major shift from Austrocedrus-Nothofagus forest to steppe shrub assemblages some time after 1800 and before 1300 BP. The probable explanation of the reduction of tree taxa calls for either drier summers or intensified land use or a combination of both
No prominent works on this page.
Late-Holocene rodent middens from Rio Limay, Neuquen Province, Argentina
Pollen analysis of late-Holocene amberat deposits from two caves near the forest-steppe ecotone in northern Patagonia documents a major shift from Austrocedrus-Nothofagus forest to steppe shrub assemblages some time after 1800 and before 1300 BP. The probable explanation of the reduction of tree taxa calls for either drier summers or intensified land use or a combination of both
Late Pleistocene C 4 Plant Dominance and Summer Rainfall in the Southwestern United States from Isotopic Study of Herbivore Teeth
Patterns of climate and C 4 plant abundance in the southwestern United States during the last glaciation were evaluated from isotopic study of herbivore tooth enamel. Enamel δ 13 C values revealed a substantial eastward increase in C 4 plant consumption for Mammuthus spp., Bison spp., Equus spp., and Camelops spp. The δ 13 C values were greatest in Bison spp. (−6.9 to +1.7‰) and Mammuthus spp. (−9.0 to +0.3‰), and in some locales indicated C 4 -d…
Stationarity Is Dead
Climate change undermines a basic assumption that historically has facilitated management of water supplies, demands, and risks.
Unfamiliar Territory
Novel forms of drought are emerging globally, due to climate change, shifting teleconnection patterns, expanding human water use, and a history of human influence on the environment that increases the probability of transformational ecological impacts. These costly ecological impacts cascade to human communities, and understanding this changing drought landscape is one of today's grand challenges. By using a modified horizon-scanning approach tha…
A 40,000-year packrat midden series from Cataviña, central Baja California, Mexico
Thirty packrat ( Neotoma spp.) middens collected from boulder fields near Cataviña, Baja California, Mexico, at 640–680 m elevation provide the first long chronology of macrofossils and pollen spanning the late Quaternary in the Central Desert of Baja California. Midden plant macrofossil and pollen assemblages document a rich chaparral/woodland assemblage during the last glacial and early Holocene dominated by Parry pinyon ( Pinus quadrifolia ) a…
Biology (3 works) · Geography (3 works) · Archaeology and ancient environmental studies (2 works) · Business (2 works) · Ecology (2 works) · Environmental Science (2 works) · Glacial period (2 works) · Holocene (2 works) · Hydrology and Drought Analysis (2 works) · Physical geography (2 works)