Dissolved Oxygen The Good Gas. Photosynthesis: Your one-stop shop for all of your oxygen needs! Carbon Dioxide (from air) Water (from ground) Oxygen (to.

Presentasi berjudul: "Dissolved Oxygen The Good Gas. Photosynthesis: Your one-stop shop for all of your oxygen needs! Carbon Dioxide (from air) Water (from ground) Oxygen (to."— Transcript presentasi:

1 Dissolved Oxygen The Good Gas

2 Photosynthesis: Your one-stop shop for all of your oxygen needs! Carbon Dioxide (from air) Water (from ground) Oxygen (to air) Carbohydrate (plant material) Solar energy + 6CO 2 + 6H 2 O → C 6 H 12 O 6 + 6O 2 Happy Rays of Sunshine

3 CO 2 O2O2 Aquatic plants and phytoplankton (single cell floating plants) release oxygen into the water as a product of photosynthesis

4 Phytoplankton (single cell plants) – are the base of the aquatic food web and provide most of the aquatic oxygen.

5 Submerged aquatic plants can provide shelter for young fish as well as house an abundant food supply.

6 Oxygen: A Soluble Gas H2OH2O H2OH2O H2OH2O H2OH2O H2OH2O O2O2 H2OH2O H2OH2O H2OH2O O2O2 O2O2 O2O2 O2O2 O2O2 H2OH2O O2O2 H2OH2O

7 Hypoxic Anoxic Normoxic Habitat Classification Based on DO Concentration 0 – 0.2 mg/L 0.2 – 2 mg/L > 2 mg/L Most fish need oxygen levels > 2.0 mg/L

8 Respiration: How we, the animals, use oxygen (and plants too!) C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + energy (in form of ATP) Carbohydrate + Oxygen  Carbon Dioxide + Water + Energy Oxygen in CO 2 and H 2 O out Previous Meal Carbohydrate in Energy out

9 CO 2 : A Soluble Gas Too! H2OH2O H2OH2O H2OH2O H2OH2O O2O2 H2OH2O H2OH2O H2OH2O O2O2 O2O2 O2O2 O2O2 O2O2 H2OH2O O2O2 H2OH2O CO 2

10 C 6 H 12 O 6 Solar Energy Heat Energy Biomass (g/m 2 /yr) O2O2 Chemical Energy (ATP) Photosynthesis Respiration Biological Production and Consumption of Oxygen

11 Daily Aquatic Oxygen Cycle SunriseNoonSunsetMidnight Dissolved Oxygen SunshineMoonshine

12 ∞ Day ∞ Night Photosynthesis Respiration

13 ∞ Photosynthesis Respiration ∞ Low Respiration High Respiration

14 ∞∞ High Photosynthesis Low Photosynthesis

15 SunriseNoonSunsetMidnight CO 2 +H 2 O  H 2 CO 3  H + +HCO 3 -  2H + +CO 3 - An increase in CO 2 causes an increase in H +  pH SunshineMoonshine pH Level

16 Decomposition – Not good for DO Decomposer organisms (mainly bacteria) consume oxygen –Sometimes consume oxygen faster than plants can produce it, even during the middle of the day! A sudden increase in organic matter (think leaf litter) can create a spike in decomposition activity – especially if it is hot –Hurricanes not only add organic matter to our waterways, but also stir up the sediment. –Can cause fish kills!!

17 Abiotic Factors That Affect DO Concentration Temperature Water Clarity Current Velocity (Flow) Wind Cloud Cover

18 Temperature The warmer water is, the less DO it can hold –Think about opening a coke bottle after it sat a few hours on the dash of your car in August. Excess DO evaporates into the atmosphere! 100% DO Saturation 0 2 4 6 8 10 12 14 16 18 20 05101520253035 Temperature (C) 100% Saturation Lavel

19 Oxygen > 100% Saturation Oxygen < 100% Saturation Oxygen diffuses out of water column Oxygen diffuses into water column Water Column Atmosphere Oxygen Can Diffuse Out of or Into the Water Column

20 Wind Stirs in atmospheric oxygen

21 Current Velocity The faster water flows, the more atmospheric oxygen is mixed into the water.

22 Water Clarity Amount of Sunlight Reaching Plants The muddier the water is, the less light reaches the plants!

23 Cloud Cover Clouds decrease the amount of sunlight reaching aquatic plants, thus oxygen production is reduced.