13.1 ecologists study relationships students will summarize the different levels of organization...
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13.1 Ecologists Study Relationships
Students will summarize the different levels of organization that ecologists study AND will be able to describe research methods ecologists use to study the environment
Objective
13.1 Ecologists Study Relationships
Standard
6 b.
Students know how to analyze changes in an ecosystem resulting from changes in climate, human activity, introduction of nonnative species, or changes in population size.
13.1 Ecologists Study Relationships
Key Concept
Ecology is the study of the relationships among organisms and their environment.
13.1 Ecologists Study Relationships
What does the word relationship mean to you?
13.1 Ecologists Study Relationships
• Ecology is the study of the interactions among living things, and between living things and their surroundings.
In what ways could we study this bear?
13.1 Ecologists Study Relationships
• A bear’s interactions with other living things
• Social interactions with other animals
• Plants• Between living
things• What animals and
plants does it interact with?
• In its surrounding• Where it lives• What does it eat?
13.1 Ecologists Study Relationships
Study this picture
13.1 Ecologists Study Relationships
What sorts of things do you notice
13.1 Ecologists Study Relationships
OrganismOrganism
1. An organism is an individual living thing
Ex: alligator
13.1 Ecologists Study Relationships
Population
Population
2. A population is a group of the same species that lives in one area
Ex: alligators
13.1 Ecologists Study Relationships
Community
Community
3. A community is a group of different species that live together in one area.
Ex: alligators, turtles, and birds.
13.1 Ecologists Study Relationships
Ecosystem
Ecosystem
4. An ecosystem includes all of the organisms as well as the climate Ex: All animals, plants, soil, water, rocks and other nonliving things
13.1 Ecologists Study Relationships
Biome5. A biome is a major regional or global community of organisms characterized by the climate conditions and plant communities that thrive there.
13.1 Ecologists Study Relationships
• Ecologists study environments at different levels of organization.
13.1 Ecologists Study Relationships
With your table: Pick an animal
Organism: 1 animal (Alligator)
Population: animals (Alligators)
Community: animals and plants (Alligators, turtles, birds, moss,)
Ecosystem: living and non-living
Biome: desert, ocean, chaparral, rainforest, forest, mountains, fresh water, grassland, savanna, etc… (p. 463)
13.1 Ecologists Study Relationships
Ecological research methods:
• Observation is the act of carefully watching something over time.
13.1 Ecologists Study Relationships
Observations of populations can be done by visual surveys.
–Direct surveys used for species that are easy to follow. Ex: You count how many deer are in the field
–Indirect surveys are used for species that are difficult to track and include looking for other signs of their presence. Ex: Looking for feces (poop) or a recent kill
13.1 Ecologists Study Relationships
• Lab experiments • Give researchers control
Ex: You want to test how a fungus reacts to heat, so in your lab experiment you turn up the temperature.
• Done inside
Negative: not reflective of the complex interactions in nature.
Experiments can be performed in the lab or the field
13.1 Ecologists Study Relationships
Field experiments • give a more accurate picture of how organisms
interact in a natural setting
Negative: may not help determine actual cause and effect. Ex: You want to know the effect deer have on a type of grass in the forest, so you block off a part of the forest to keep out the deer. By monitoring the fenced and unfenced area, you can determine the deer’s effect on the grass.
Experiments can be performed in the lab or the field
• performed where the organisms live. Ex: In the forest
13.1 Ecologists Study Relationships
• Computer and mathematical models can be used to describe and model nature. Ex: GPS transmitter
• Modeling allows scientists to learn about organisms or ecosystems in ways that would not be possible in a natural or lab setting.
Ecologists use data transmitted by GPS receivers worn by elephants to
develop computer models of the animal’s movements.
If observation and experimentation don’t work…turn to modeling
GPS transmitter
13.1 Ecologists Study Relationships
Discuss with your neighbor:
What are the 5 levels of organization?
Name the 3 general methods used by ecologists to study organisms.