What is the correct level of organization think back to the card activity from our previous class a tom m olecule o rganelle c ell t issue organ o rgan system o rganism p opulation ID: 935421
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Slide1
Ecosystems
Slide2Levels of Organization in Ecology
What is the correct level of organization (think back to the card activity from our previous class)?
a
tommoleculeorganellecelltissueorganorgan systemorganismpopulationcommunityecosystem
Wikimedia Commons free use from NASA
Slide3Populations vs. Communities
What is the difference between a biological population and a biological community?
A
biological population is a group of organisms, all of the same species, which interbreed and live in the same area at the same time, while a biological community is made of interacting populations in a certain time.
Slide4Competition
What is competition?
Competition is one of the many symbiotic relationships occurring in nature. Members of species compete for resources, especially for limited natural resources.
Examples?trees that grow very close together vie for sunlight and soil nutrients, lions and tigers that vie for similar prey, and a farm of rice paddies with weeds growing in the field
Slide5Competition
What happens to competition between individuals as population size increases?
Competition will also increase.
If the demand for resources exceeds the supply, then the population size will eventually decrease.
Slide6Limiting Factors
Do populations often grow exponentially?
What are limiting factors?
Limiting factors are any factors (things) that affect an organism’s ability to survive in its environment. These factors affect population growth.Examples?availability of food and water, predators, temperature, space/shelter, and disease
Slide7Density-Dependent Factors
What are density-dependent factors?
Factors that depend upon the size of the population. These factors will have an increasing effect as the population size increases.
Examples?availability of food and water, competition, predators, and disease
Slide8Density-Independent Factors
What are density-independent
f
actors?Factors that are not dependent upon the size of the population and can affect any population.Examples?temperature, weather (storms, floods, drought), and habitat disruption by humans
Slide9Carrying Capacity
The maximum number of individuals that an environment can support.
Why is knowing carrying capacity important to ecologists?
Slide10Slide11Slide12Slide13Slide14Write it“How does human activity affect each biotic or abiotic factor
?”
“
Which biotic factor in a forest ecosystem serves as a habitat for many animals?” “How are trees affected by human activities?”“How does this impact the animals in the ecosystem that rely on those trees?”