A5032469961- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Pacific and Southeast Asian Studies
- Geological formations and processes
- Coastal wetland ecosystem dynamics
- Pleistocene-Era Hominins and Archaeology
- Ecology and Vegetation Dynamics Studies
- Tree-ring climate responses
- Marine and coastal plant biology
- Isotope Analysis in Ecology
- Plant Diversity and Evolution
- Forest Ecology and Biodiversity Studies
- Archaeology and ancient environmental studies
- Lichen and fungal ecology
- Microbial Community Ecology and Physiology
- Species Distribution and Climate Change
- Evolution and Paleontology Studies
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Plant and animal studies
- Peptidase Inhibition and Analysis
- Geochemistry and Elemental Analysis
- Botany, Ecology, and Taxonomy Studies
- Plant and Fungal Species Descriptions
- Amazonian Archaeology and Ethnohistory
Tongji University
2011-2024
Florida Institute of Technology
2002-2006
University of Amsterdam
2004-2006
University of Wyoming
1999
Impacts of global climate change on terrestrial ecosystems are imperfectly constrained by ecosystem models and direct observations. Pervasive transformations occurred in response to warming associated climatic changes during the last glacial-to-interglacial transition, which was comparable magnitude projected for next century under high-emission scenarios. We reviewed 594 published paleoecological records examine compositional structural vegetation since glacial period project magnitudes...
Abstract We present a multiple‐access key and searchable data base to Neotropical pollen that is available as freeware. The based on FileMaker 5 contains c . 6000 images of >1000 taxa. All are acetolysed grains collected from vouchered herbarium specimens. selection taxa be included in the predicated upon their probable occurrence lake sedimentary records, which turn was flower structure, sexual mechanisms ecology. forgiving format it can used with incomplete or where researcher cannot...
Widespread species- and genus-level extinctions of mammals in North America Europe occurred during the last deglaciation [16,000-9,000 yr B.P. (by (14)C)], a period rapid often abrupt climatic vegetational change. These are variously ascribed to environmental change overkill by human hunters. By contrast, plant since Middle Pleistocene undocumented, suggesting that species have been able respond changes past several glacial/interglacial cycles migration. We provide evidence from...
The sensitivity of pollen as an indicator elevation in neotropical lowland and Andean forests was measured using modern samples collected from moss-polsters along a transect between 340 m 3530 surface sediments swamps (240 m) Madre de Dios, Peru. A blind study, the same following year, provided test reproducibility. results show (1) clear elevational distribution patterns (2) ability calibration data to predict altitude samples. Characteristic associations taxa are found under differing...
ABSTRACT Fossil pollen data from sediment cores may be used as a measure for past plant diversity. According to the theory of probability, palynological richness is positively related count. In low count, only common taxa are detected, whereas rare detected by chance. The detection all requires very high which time‐consuming. regular investigations, in spectra varies with Rarefaction analysis estimates an exactly equal‐sum count samples, so that comparison between samples meaningful....
Abstract Pollen, charcoal, magnetic susceptibility, and bulk density data provide the first paleoecological record spanning last 33,000 years from western cordillera of Peruvian Andes. Sparse super-puna vegetation existed before 30,000 cal yr B.P. around Lake Compuerta (3950 m elevation), prior to a sedimentary hiatus that lasted until c. 16,200 When sedimentation resumed, glacial foreland or flora is represented in which Polylepis was significant element. Glacial outwash, marked by high...
Change in diversity of fossil pollen through time is used as a surrogate for biodiversity history. However, there have been few studies to explore the sensitivity measured vegetation changes and relationship between plant diversity. This paper presents results study assess relative abundance from different altitudinal belts (subandean forest, Andean subparamo grassparamo) three records tropical Andes Colombia. The indicated that declined with altitude positively correlated lower negatively...
Abstract Fossil pollen records from the high Andes of Ecuador and northern Peru show that Alnus increased in abundance at most sites following warming associated with onset Holocene. The peak occurred between ∼9000 5000 yr BP. However, 6500 4500 BP, declined markedly all available records, including both within above its modern distribution range. Even though beginning this decline may have been time‐transgressive, greatest reduction is consistent sites, occurring ca. This synchrony suggests...
Differentiation of most North American spruce (Picea) species can be done based on needle morphology and anatomy. Picea breweriana S. Watson, chihuahuana Martinez, mariana (Mill.) BSP, martinezii Patterson, rubens Sarg. needles have two continuous resin ducts extending from near the base to tip. engelmannii Parry ex Engelm., glauca (Moench) Voss, pungens mexicana sitchensis (Bong.) Carr. variable numbers short, intermittent or sacs. Within each these groups, could differentiated...
In charcoal analysis, number and area of particles are the most commonly measured parameters. However, neither measurement is precise as fragments can be broken into smaller pieces during preservation laboratory processing, then both apparent will increase. Volume a more reliable parameter than to represent amount but difficult measure. simple approximation provides stable proxy estimate volume. By applying formula CIA3/ 2 (where C constant, Ai particle, I means sum), measures shown...