Aquatic Ecology Practice Midterm

Higher turbidity can . . .

• increase the temperature of water

• negatively affect aquatic life

• have all of these effects

• decrease the dissolved oxygen

Based on the article "Controls of Nitrates," what is the best recommendation for managing a watershed?

• focus on the smaller streams at closer to the source of the watershed

• increase the amount of dams in order to prevent pollution from moving downstream

• focus on the largest ponds and lakes in the watershed

• focus on tier 3 streams in the watersheds

What is the most limiting nutrient for plant growth in lakes?

• nitrogen

• phosphorus

• magnesium

• sulfur

These organisms are the most important part of the nitrogen cycle, allowing plants to take up the proper forms of nitrogen.

• fish

• trees

• ALL

• bacteria

When mercury and other heavy metals move throughout the food chain into larger species, it is called

• bio-accumulation

• fixation

• hypoxia

• biomagneficiation

Which is true about the carbon cycle?

• ALL

• It is associated with photosynthesis

• Decay of dead materials can recycle carbon back to the system

• Fossil fuels, coal and natural gas are a major contributor to the cycle

• Carbon dioxide is a type of inorganic molecule

What are the ways the suspended solids, that cause turbidity, get into waterways?

• erosion of banks of streams and rivers

• stormwater entering waterways

• over-development and urban runoff

• ALL

Which form of phosphorus is produced by non-living materials?

• PP

• DOP

• TP

• DIP

Which is the best indicator of a lake's phosphorus content?

• DOP

• TP

• DIP

• PP

An area that lacks oxygen, such as at the bottom layers of a wetland, is called

• aerobic

• reduction

• anaerobic

• oxidation