Food webs, energy, and cycling
How does the amount of sunlight available to an ecosystem affect a primary consumer?
More sunlight leads to higher productivity, allowing producers to create more food.
Emigration can be due to a habitat's ___________.
Limited-carrying capacity
Which president enacted the Farm Bill?
Franklin D. Roosevelt
Between what two biomes do grasslands exist between?
Forest and deserts
What percent of forests remain in the United States?
33%
How would the loss of a producer, like plants, affect a secondary consumer?
Disrupts the entire food chain and reduces the population of secondary consumers.
What is a biotic factor which may impact wildlife populations?
Parasitism
Levees are most commonly used for what?
Stopping water from naturally changing course
Where are savannas typically found?
Africa, Australia, and South America
What wetland is dominated by emergent vegetation?
Approximately what percent of energy is passed from one trophic level to the next ecosystem?
10%
What method for measuring populations utilizes recording signs of animals, such as droppings, tracks, nest counts, etc?
Index of population size
A wetland with woody plants, saturated/slow moving water and a lack of oxygen in the soil can be described as a _____.
Swamp
What is the specific mission of the Natural Resources Conservation Service?
To conserve soils for agricultural production
What is NOT a reason for conducting a prescribed burn?
Preventing wildlife from entering unwanted areas
Why are detritivores not usually included in trophic level diagrams?
They consume dead organic matter from all trophic levels, making them difficult to place them in a single simple level.
death rate is expressed as the number of deaths per how many individuals per unit of time?
1,000
Hurricanes do less financial damage, flood further inland and displace more people when coasts are heavily developed. True or False?
False
Wy do temperate grassland have the most fertile soil on earth?
Grass root decaying below the surface enriches the soil with nutrients
What percent of Duck Stamp sales does to supporting habitat restoration?
98%
Why does the energy absorbed by each trophic go down as we increase in trophic levels?
Density is divided into which of the two factors?
Independent and dependent
Sedimentation and soil runoff
Tillage is primarily used for what?
Control weeds and aerate soil
In order to maintain a healthy balance of nutrients in the soil, Sam plants corn in the spring and soybeans in the fall. This is known as what kind of agricultural method?
Rotational crops