1 / 21

Paleolimnology and Succession in Aquatic Systems

Paleolimnology and Succession in Aquatic Systems. Sediments of Lakes. Hold records of past lake conditions Hold records of past terrestrial conditions. From Hutchinson Treatise on Limnology.

barto
Download Presentation

Paleolimnology and Succession in Aquatic Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Paleolimnology and Succession in Aquatic Systems

  2. Sediments of Lakes • Hold records of past lake conditions • Hold records of past terrestrial conditions

  3. From Hutchinson Treatise on Limnology (a) General zonation and processes in lakes. (b) Processes and sediments in lakes with abundant supply of terrestrial sediment. (c) Processes and sediments in lakes with dominant carbonate sediment and little influx of terrestrial sediment. (Sketched from data in Hutchinson (1957) A treatise on limnology, Wiley; Reeves (1968) Introduction to paleolimnology, Elsevier; and Matter and Tucker (1978) Modern and ancient lake sediments, International Association of Sedimentologists, Special Publication No. 2, Blackwell.)

  4. Glacial Pleistocene Lake Vermont • From Tufts University Varve Project

  5. Varve Project

  6. Varve Project

  7. Some Biogenic Substances Occur in Lake Sediments

  8. Isolate Pigments by Thin Layer Chromatography

  9. Paleolimnology Studies the Record of Change in Aquatic Systems • Erosion --> Sedimentation (mineral deposits) • Then organic input > rate of degradation (organic deposits)

  10. Standard Dogma for Lake Succession

  11. Initial Stages in the Development of a Lake • Phytoplankton production depends on nutrient input • In eutrophic condition, dense algal layers create: • Decreased light penetration • Decreased trophogenic zone

  12. Development of Hardwater lakes • Ca inactivates P, Fe, Mn • May be counteracted by high organic loading • Thus, very rapid change from oligotrophic to eutrophic environment • Can be counteracted by cation exchange mechanisms of plants (particularly mosses like Sphagnum)

  13. The End of Lake Development • A change from phytoplankton to littoral production • Environment can become dystrophic (usually with high levels of humic acids)

  14. Stratigraphy of LagodiMonterosi

  15. Swamp • Woody vegetation through basin

  16. Marsh • Wetland dominated by herbaceous plants

  17. The Everglades

  18. Mire • High humidity and high rainfall lead to thick peat accumulations

  19. Fen • Minerotrophic Mire: groundwater supplies nutrients; usually circum neutral or basic

  20. Bog • Ombotrophic Mire: inorganic nutrients from rainwater; pH drops as Sphagnum increases

More Related