Lab: Aquatic Environment

Question 1

Aquatic Environments

Answer 1

Aquatic environment are very diverse

• they can habitat fish, amphibians, insects, plants, reptiles, mammals, and bacteria
• –the different groups all have different ways of taking in O2
• ——Gills vs. Lungs… gills are more efficient; amphibians can absorb O2 through pores on their skin

Question 2

Factors that control O2

Answer 2

Temperature: low-temperature water = more oxygen
Depth: shallower = more oxygen
Velocity: moving water = more oxygen

Question 3

Lake Stratification

Answer 3

2 layers:

• Epilimnion: (top layer) warmer, more light, more O2, less nutrients
• Hypolimnion: (bottom layer) cooler, less light, less O2, more nutrients (“depth’s effect on O2” overpowers “temperature’s effect on O2”)

Question 4

Light Importance

Answer 4

Light is needed for photosynthesis, light penetration is affected by water purity, as well

Question 5

Pollution

Answer 5

Point Source: pollution can be located at a fixed spot.
Non-point Source: pollution can not be accurately pinpointed.
Bioindicator: organisms used in order to test for concentration of pollution in a environment; have short life-spans and sensitive to pollutants.

Question 6

LD50

Answer 6

(Lethal dose 50) the concentration of pollutant required to kill 50% of the population