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20 Cards in this Set
- Front
- Back
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1. equilibrium
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births and deaths are more or less equal over time, the population.
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2. exponential increase
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The growth produced when a base population increases by a given percentage each year.
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3. population explosion
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a sudden large increase in the size of a population.
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4. j-curve
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If we plot numbers over time during an exponential increase, the pattern produced
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5. s-curve
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Natural mechanisms may cause the population to level off and continue in a dynamic equilibrium.
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12. carrying capacity
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there is a definite upper limit to the population of any particular plant or animal that an ecosystem can support
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16. critical number
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The survival and recovery of a population depends on a certain minimum population base.
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17. threatened
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species whose populations are declining rapidly
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18. endangered
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when the population is close to what scientist to be its critical number
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21. overgrazing |
if the herbivore eats plants faster than the plants can grow |
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22. predator removal
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eliminating predators or other natural elements upsets basic plant herbivore relationships in the same way as introducing an animal without abound as well
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23. keystone species
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a species on which other species in an ecosystem largely depend such that if it were removed the ecosystem would change drastically
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26. introduced species
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is an organism that is not native to the place or area where it is considered introduced and instead has been accidentally or deliberately transported to the new location of human activity
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28. natural selection
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in nature there is a species’ gene pool toward features that enhance survival and reproduction with the existing biotic community and environment.
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29. biological evolution
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the modification of the gene pool of a species by natural selection over the course of many generations
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30. extinction
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if a viable population is not maintained at any stage
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32. migration
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seasonal movement of animals from one region to another
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33. Charles Darwin & Aflred Russell Wallace
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Charles darwin discovered natural selection, Alfred russel wallace, british naturalist, explorer geographer anthropologist, and biologist
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44. resilience
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disturbances and shifting in biotic relationships not only may have little detrimental effect on an ecosystem, but many actually contribute to its ongoing function
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49. US forest service
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since 1992 have officially adopted ecosystem management as their management paradigm
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