Food Chains/Food Webs
Population Growth Trends
Community Relationships
Biomes
Potpourri
100
An organism that collects energy from sunlight or inorganic substances to produce food
What is an autotroph?
100
Four factors that affect population growth rate
What are natality, mortality, emigration, and immigration?
100
The pattern of spacing of a population within an area
What is dispersion?
100
The series of predictable changes that occur in a community over time
What is ecological succession?
100
The three types of symbiotic relationships
What are mutualism, commensalism, and parasitism?
200
An organism that break down dead organisms by releasing digestive enzymes
What are decomposers or detritivores?
200
A growth model in which a population grows exponentially until it reaches carrying capacity, where it begins to level out
What is logistic growth model?
200
They keep a population from growing forever
What are limiting factors?
200
Species that break down rock to form soil in primary succession
What are pioneer species?
200
The three patterns of dispersion
What are clumped, random, and uniform
300
Each step in a food chain or food web
What are trophic levels?
300
The study of human population size, density, distribution, movement, and birth/death rates
What is demography?
300
The two categories of limiting factors
What are density-dependent and density-independent
300
Earth's three main climate zones
What are polar, temperate, and tropical?
300
A species that has an especially large impact on its community because of its abundance in the community
What is dominant species?
400
The rule that limits the length of a food chain by stating that the longer the chain, the bigger the impact of a fluctuation
What is the dynamic stability hypothesis?
400
Occurs when the birthrate equals the death rate
What is zero population growth?
400
States that no two species can occupy the same niche in the same habitat at the same time
What is the competitive exclusion principle?
400
Nutrient-poor lakes, usually found in the mountains
What are oligotrophic lakes?
400
The reproduction strategy of usually small organisms in which they produce many offspring and spend little effort raising young to adulthood
What is r-strategy?
500
Three types of consumers
What are herbivore, omnivore, and carnivore?
500
The three age groups in an age-structure graph
What are pre-reproductive, reproductive, and post-reproductive stages
500
A species that has an especially large impact on its community because of its important role in the community dynamics
What is a keystone species?
500
A marine ecosystem that is a narrow band where the ocean meets land
What is an intertidal zone?
500
The five zones in an open ocean ecosystem
What are photic, aphotic, benthic, and abyssal zones?
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