Chapter 1- Introduction To Limnology Flashcards
What is limnology?
Forel (1892): The oceanography of lakes
-using techniques from physical and chemical oceanography were useful
Modern definition is broad and includes all inland waters
–Is a physical science with a large biological component
Where is the world’s water?
- Ocean (97.3%)
- Ice (2.19%)
- Groundwater (0.5%)
- Soil moisture (0.005%)
- Atmospheric water vapor (0.001%)
- Inland freshwater lakes (0.009%)
- Inland saline lakes (0.008%)
- Rivers (0.001%)
Limnology is highly interdisciplinary
Geology: Erosion and sedimentation are geologic processes
Three factors that are important factors in limnology are…
–What is the soil like (edaphic factors)?
•Allochthonous vs. autochthonous materials
–What are the physical dimensions?
–What is the climate? (not really geology, more meteorology/climatology)
Allochthonous
Originating from the outside
autochthonous
Produced from within
Oligotrophy
Poor ale
eutrophy
Rich lake
Mesotrophy
Everything in between
Temperature and oxygen stratification
Look at graph
What is the inorganic carbon fixed by photosynthetic producers?
Oligotrophic ?
7 – 25 g/C/year/m2
What is the inorganic carbon fixed by photosynthetic producers?
Mesotrophic
25-75
What is the inorganic carbon fixed by photosynthetic producers?
Eutrophic (natural)
75-250
What is the inorganic carbon fixed by photosynthetic producers?
Eutrophic (polluted)
350-700
What are some characteristics of eutrophic lakes?
Shallow, broad littoral zone •Epilimnon/hypolimnon ratio greater •Dirtier water, often brown or greenish brown •Nutrients abundant •Profundal sediments in an organic copropel •Oxygen depleted in summer hypolimnon •Littoral plants abundant •Abundant phytoplankton •Algal blooms common •Profundal biomass can tolerate low oxygen •Profundal benthic biomass often high •Chironomus present •No stenothermal fish in hypolimnon
