Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
Why are aquatic ecosystems significant? |
Buoyancy, narrow temperature range, dispersal medium, solvent, greater divesity |
|
|
What are the three zones in a lake ecosystem in order of depth ? |
Littoral, limnetic, profundal |
|
|
What are the limits on productivity? |
Light, temperature stratification, nutrient availability |
|
|
What defines an oligotrophic lake? |
Little shore vegetation Low concentration of nutrients and plankton in the limnetic zone Steeply sloping shorelines Sand, gravel, rock bottom Sparse fish population including in the profundal zone |
|
|
What defines a eutrophic lake? |
A lot of shore vegetation High concentrations of nutrients and plankton in the limnetic zone Dense fish population in the limnetic zone No life in tue profundal zone Gently sloping shoreline Silt, sand, clay bottom |
|
|
What is significant about coastal and upwelling areas? |
Make up 10% of the oceans but make up 99% of the fish caught |
|
|
List types of water pollution |
Suspended particles Inorganic water soluble chemicals Organic compounds Oxygen consuming wastes Thermal pollution Disease causing agents Radioactive compounds |
|
|
Why are suspended particles a problem? |
Shelters are buried, light penetration is limited, organisms removed from rocks |
|
|
Why are nonpoint source spills a problem? |
Hard to identify and control |
|
|
What is eutrophication? |
The addition of plant nutrients to water |
|
|
How do eutrophic lakes stratify? |
Three distinct layers form in summer (warm, thermocline, cool) with the top layer being high in oxygen due to photosynthesising plants and the bottom layer being anoxic due to the BOD of decaying organisms |
|
|
Why are algal blooms harmful? |
Produce toxins that concentrate in the food chain and cause coastal dead zones |
|
|
How can algal blooms be controlled? |
Benthic grazers |
|
|
Where do demersal fish and pelagic fish live? |
Demersal are bottom dwelling and pelagic are surface dwelling |
|
|
Where are most fish caught? |
90% marine of which 50% are in coastal areas and 50% are in upwelling areas |
