Past freshwater changes
18 important questions on Past freshwater changes
What is the most diverse and highly impacted natural system? And why?
- Very high extinction rates, because human uses and pollution takes their roll
The base of freshwater food chains is often occupied by?
- In terrestrial systems, this is most often centred in macroplants
What are streams, rivers and lakes?
- Their existence is dependent on the balance of precipitation and evaporation
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Are continuous range shifts possible in fresh water systems?
How are lake low and high stands indicated?
What are mega droughts?
What can you see from lake records?
- Precipitation changes
What did glacial ice sheets do?
What are varves? And what can be measured?
- Counting the number of varves associated with the transition at the end of the Younger Dryas provides a high-resolution estimate of its duration
What do lakes contribute knowlegde to?
- Changes in regional climate
- Changes in vegetation
- Interregional synchrony
- Global magnitude
- Cycles
- Speed of change
What are changes importanton short and long term scales?
- Streamflow
- Temperature
- Watershed fragmentation
- Capture
- Lake drying and filling
- Lake thermal zonation
When do changes in streamflow result?
What happens once air masses have lost moisture in major storm events?
When does streamflow increase?
How wil the timing of streamflow vary?
- Snowmelt will be erarlier due to increased temperature -> earlier season peaks in flow followed by late season flows that are reduced relative to current conditions
How does stream following air temperature?
Which streams dominate stream and river systems?
What will be more sensitive to changes in air temperature?
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