Paper Search Console

Home Search Page About Contact

Journal Title

Title of Journal:

Search In Journal Title:

Abbravation: Quaternary Research

Search In Journal Abbravation:

Publisher

Cambridge University Press

Search In Publisher:

DOI

10.1007/s10126-015-9665-5

Search In DOI:

ISSN

1096-0287

Search In ISSN:
Search In Title Of Papers:

Paleoecological Studies at Lake Patzcuaro on the W

Authors: W A Watts J Platt Bradbury
Publish Date: 1982/01
Volume: 17, Issue: 1, Pages: 56-70
PDF Link

Abstract

A 1520cm sediment core from Lake Patzcuaro Michoacan Mexico is 44000 yr old at the base All parts of the core have abundant pollen of Pinus pine Alnus alder and Quercus oak with frequent Abies fir The interval dated from 44000 to 11000 yr ago has a homogeneous flora characterized by abundant Juniperus juniper pollen and frequent Artemisia sagebrush It is believed to represent an appreciably drier and colder climate than at present The Holocene at Lake Patzcuaro is characterized by a moderate increase in Pinus pollen and the loss of Juniperus pollen as the modern type of climate succeeded Alnus was abundant until about 5000 yr ago its abrupt decrease with the first appearance of herbaceous weed pollen may reflect the cutting of lakeshore and streamcourse alder communities for agricultural purposes or it may simply reflect a drying tendency in the climate Pollen of Zea corn appears at Lake Patzcuaro along with low peaks of chenopod and grass pollen at 3500 yr BP apparently recording a human population large enough to modify the natural environment as well as the beginning of agriculture A rich aquatic flora in this phase suggests eutrophication of the lake by slope erosion In the most recent period corn is absent from the sediments perhaps reflecting a change in agricultural practices The environment changes at Lake Patzcuaro are similar to and correlate with those in the Cuenca de Mexico where diatom stratigraphy from the Chalco basin indicates fluctuations in lake levels and lake chemistry in response to variations in available moisture Before 10000 yr ago climates there were cool and dry and the Chalco basin was occupied by a shallow freshwater marsh that drained north to Lake Texcoco where saline water accumulated by evaporation Increases in effective moisture and possible melting of glaciers during the Holocene caused lake levels to rise throughout the Cuenca de Mexico and Lake Texcoco flooded the Chalco basin with brackish water After 5000 yr ago such flooding decreased and shallow freshwater ponds and marshes were restored in the Chalco basin This environmental change coincides with the appearance of Zea pollen and suggests cultural control of lake levels and salinity

Keywords:

References

citation title=Pollen analyses in Guatemala and El Salvador citation author=Tsukada M citation author=Deevey ES citation author=Cushing EJ citation author=Wright HE citation publication date=1967 citation journal title=Quaternary Palaeoecology citation firstpage=303 citation lastpage=331

.
Search In Abstract Of Papers:
Other Papers In This Journal:
  1. Ice-Sheet Glaciation of the Puget Lowland, Washington, during the Vashon Stade (Late Pleistocene) 1
  2. The Timing of Late Pleistocene Mammalian Extinctions in North America
  3. An Altitudinal Cline in Tropical African Grass Floras and Its Paleoecological Significance
  4. Glaciations of the West Coast Range, Tasmania
  5. Tephrochronology of Late Wisconsin Deglaciation and Holocene Glacier Fluctuations Near Glacier Peak, North Cascade Range, Washington
  6. Determining the Exposure Age of a Karst Landscape
  7. Stable Isotope Stratigraphy of a Late Last Interglacial Speleothem from Rana, Northern Norway
  8. Holocene Paleoenvironmental Change in the Kenyan Central Rift as Indicated by Micromammals from Enkapune Ya Muto Rockshelter
  9. Some Effects of Partial Recrystallisation on 14 C dating Late Pleistocene Corals and Molluscs
  10. Some Effects of Partial Recrystallisation on 14 C dating Late Pleistocene Corals and Molluscs
  11. Climate Variation and the Rise and Fall of an Andean Civilization
  12. Saharan Dust Transport and High-Latitude Glacial Climatic Variability: The Alboran Sea Record
  13. Pedogenic Gradients for Iron and Aluminum Accumulation and Phosphorus Depletion in Arctic and Alpine Soils as a Function of Time and Climate
  14. Glacial-Marine Sedimentation and Quaternary Glacial History of Marguerite Bay, Antarctic Peninsula
  15. QUA volume 31 issue 1 Cover and Front matter
  16. Paleoclimatic Significance of the Stable Isotopic Composition and Petrology of a Late Pleistocene Stalagmite from Botswana
  17. Mass Balance and Sliding Velocity of the Puget Lobe of the Cordilleran Ice Sheet During the Last Glaciation
  18. Tephrochronology of the Western Gulf of Mexico for the Last 185,000 Years
  19. Is There Evidence for Solar Forcing of Climate in the GISP2 Oxygen Isotope Record?
  20. Plio-Pleistocene Marine-Continental Correlation using Habitat Indicators from Olduvai Gorge, Tanzania
  21. Late Weichselian Marine 14 C Reservoir Ages at the Western Coast of Norway
  22. Late-Glacial and Early Holocene Environmental and Climatic Change at Lake Tambichozero, Southeastern Russian Karelia
  23. The Late Wisconsinan Savanna Terrace in Tributaries to the Upper Mississippi River
  24. The Late Wisconsinan Savanna Terrace in Tributaries to the Upper Mississippi River
  25. Optical Dating of Holocene Dune Sands in the Ferris Dune Field, Wyoming
  26. Fire and Vegetation History from the Coastal Rain Forest of the Western Oregon Coast Range
  27. Alluvial Pollen on the North China Plain
  28. Vegetation, Climate, and Sea Level in the Past 55,000 Years, Hanjiang Delta, Southeastern China
  29. Aspartic Acid Racemization in Late Wisconsin Lake Ontario Sediments
  30. The Classic Marine Isotope Substage 5e
  31. Mire Development and Environmental Change, Barrington Tops, New South Wales, Australia
  32. Significance of Two New Pleistocene Plant Records from Western Europe
  33. Lake Tapps Tephra: An Early Pleistocene Stratigraphic Marker in the Puget Lowland, Washington
  34. Modern and Holocene Pollen Assemblages from Some Small Arctic Lakes on Somerset Island, NWT, Canada
  35. Toward the Definition of Criteria for the Recognition of Artificial Bone Alterations 1
  36. Late Weichselian and Holocene Relative Sea-level History of Bröggerhalvöya, Spitsbergen
  37. A Comparison of Radiolarian and Foraminiferal Paleoecology in the Southern Indian Ocean: New Evidence for the Interhemispheric Timing of Climatic Change
  38. Late Wisconsin Ice-Surface Profile Calculated from Esker Paths and Types, Katahdin Esker System, Maine
Search Result: