Introduction
Where is the study located?
Yellowstone
How many sampling methods where used?
What model doesn't have an age-depth model?
Blacktail
Was the hypothesis supported?
yes
What is a diatom?
Diatoms are a major group of algae, specifically microalgae, found in the oceans, waterways and soils of the world.
3
How many diatom valves were counted on each side?
300
What do the solid lines denote in figures 3, 4, & 5?
significant zones using a broken stick model based on cluster analysis
What was the driver that ended the late-glacial period?
increase in solar isolation
What is Paleolimnology?
the study of lake sediment
What are the names of the study sites?
Blacktail Pond, Cub Creek Pond, Hedrick Pond
Where were the cores retrieved from?
Pond margin and ice surface
What does an age-depth model show?
The deeper the sample the older
What are the three types of diatoms?
Tychoplanktic, Planktic, Benthic
What date is our final project due?
May 2nd
What time period did this research take place?
Late-Glacial and Early-Holocene
What method was used for data analysis?
zonation scheme
How many different zones are each pond broken into?
Cub Creek = 11
Hendrick = 5
Blacktail = 7
What species of diatoms favor shallow or deep water?
Tychoplanktic = deep
Benthic = shallow
How are the three small lakes different?
differ in superficial geology, elevation, vegetation, and precipitation seasonality
What is the hypothesis?
Large scale climate change is a primary driver of shifts in diatom assemblages.
What was excluded from the age model study at Cub Creek?
bulk sediment dates and one date on pollen
What is figure 6?
Open to interpretation
What periods of time were the major diatom shifts noted?
~13.8 - 13.2 ka
~11.3 - 11.0 ka
~8.8 ka
What was the title of the last journal article that was lead by a student discussion?
The Holocene - Younger Dryas Transition Recorded at Summit, Greenland