Levels of Organization
An ecologist wants to study the behavior of a pack of wolves in Beaverhead County. What level of hierarchy would the ecologist look at to study only the group of wolves?
Population
A group of kids go out for a hike to a mountain lake. On their return, one of them found a tick embedded into his leg.
Parasitism
Very little rain, leads to fewer plants, temperature is high
Desert
In a food chain consisting of grass, rabbits, snakes, and hawks, which organism is a primary consumer
Rabbits
A population of squirrels have immigrated to an existing species in a forest. This immigration leads to:
An increase in population of the squirrels in the forest
A group of multiple different species in a certain area
Community
A population of elk that reside in the Ruby Valley have shown signs of decrease in the past 10 years. The elk population have been fighting for the same resources in the ecosystem.
Intraspecific competition
Moderate precipitation with some dry seasons, fairly productive vegetation
Grasslands
How much energy is typically lost to heat or used by organisms as energy flows through an ecosystem
90%
What is a density independent factor in a desert?
Rainfall
The combination of populations, communities, and abiotic factors
Ecosystem
Which describes the relationship between bees and flowers as both are benefitting from the interaction
Mutualism
Coniferous forest in cold wet climate
Taiga
Worms are used in gardens to help recycle material back into the soil to help the plants grow. What type of organism are worms?
Decomposers
Which survivorship curve (I, II, or III) represents organisms that have many offspring but provide little to no parental care?
Type III
A group of ecosystems that share common climates and location to the equator
Biome
A feeder fish usually follows behind sharks to pick up food scraps that they leave behind. The fish gets food and the shark is unaffected.
Commensalism
What two biomes share the same amount of precipitation?
Desert and Tundra
Trapping has severely reduced the population of rabbits in an ecosystem with grass, snakes, and hawks. What is the most likely effect this will have on the other organisms?
The snake population will decrease rapidly and the grass population will increase
How does a niche help different species, such as various sandpipers, live on the same beach without competing for the same food?
They partition resources by having different beak lengths to reach different depths.
All of the abiotic and biotic factors of the whole planet
Biosphere
Describe the relationship between predator prey populations.
As the prey population increases so does the predator population, then the predator population gets too large and the prey population decreases.
Explain why biodiversity is often higher in biomes closer to the equator, such as tropical regions, compared to the arctic.
Tropical regions have more stable temperatures and higher precipitations supporting more niches.
Bees are one of the primary consumers in the park, when bees are removed from the ecosystem, the ecosystem balance is destroyed. Bees are an important part of the ecosystem in Yellowstone National Park, they are;
Keystone Species
Without other changes to a population, which of the following will cause a population to decrease in size?
The birth rate is less than the death rate