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ch 4 Populations
Able/Brown flashcards
18
Biology
9th Grade
04/30/2008

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Term
environmental factors
Definition
abiotic and biotic factors that affect populations in an ecosystem.
Term
exponential population growth
Definition
a population will grow exponentially unless it is affected by biotic and abiotic factors.
Term
limiting factors
Definition
biotic and abiotic factors that limit or control population
Term
density dependent factors
Definition
things that are affected by the numbers of a population like disease, food, competition and predation
Term
density independent factors
Definition
factors that affect a population that are not caused by the numbers of that population like temperture, storms, habitat disruption, radiation, ect.
Term
carrying capacity
Definition
the number of individuals that a given ecosystem will support
Term
demography
Definition
the study of human population growth, birth and death rates.
Term
migration
Definition
how humans move around. We are all immigrants from somewhere.
Term
biodiversity
Definition
the variety of life in an ecosystem. It tends to increase as you move toward the equator.
Term
threats to biodiversity
Definition
habitat loss, fragmentation, degradation, exotic species introduction, pollution
Term
types of pollution
Definition
bacteria (e. coli), chemical, petroleum, heavy metals (lead, mercury, physical (trash)
Term
conservation
Definition
the field of science that works at protecting the enviroment
Term
Endangered Species Act
Definition
made law in 1973 by Nixon that makes it illegal to harm or threaten any organism on the list
Term
National and State Parks and wildlife management areas
Definition
areas set aside by governments for the protection of wildlife.
Term
Teddy Roosevelt
Definition
first president to realize the need for conservation
Term
Jimmy Carter
Definition
established the department of natural resources in Georgia
Term
habitat corridors
Definition
areas of land between conservation areas that allow species to move between them freely.
Term
buffer zones
Definition
areas aroung lakes or rivers taht protect them from erosion and pollution
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