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ES_CH9

Environmental Science: Chapter 9 Vocab

TermDefinitionPersonal Interpretation
Background Extinction The continuous, low level of extinction of species Natural Extinction
Extinction Rate The percentage or number of species that go extinct within a certain time period The percentage of species that go extinct within a certain period of time
Mass Extinction The extinction of many species in a relatively short geologic time Unnatural Extinction
Local Extinction When a species is no longer found in the area it once inhabited but is still found elsewhere in the world When a species is extinct in just one area
Ecological Extinction When so few members of a species are left that it can no longer play its ecological role in the biological communities where it is found When there are so few individuals left that they can no longer play their role in their community
Biological Extinction When a species is no longer found anywhere in the world "For good" Extinction
Endangered Species Has so few individual survivors that the species could soon become extinct in all or most of its natural range Almost extinct
Threatened(Vulnerable) Species Is still abundant in its natural range but, because of declining numbers, is likely to become endangered in the near future Almost endangered
Instrumental Value A species usefulness to us in providing many of the ecological and economical services that make up the earth's natural capital A species usefulness to us based on the ecological and economical benefits they provide us with
Existence Value Each wild species has the inherent right to exist and play its ecological roles, regardless of its usefulness to us. The thought that all species have the unspoken right to live and contribute to their community
HIPPCO Habitat destruction, degradation, and fragmentation; Invasive species; Population and resource use growth; Pollution; Climate change; Over-exploitation Habitat destruction, degradation, and fragmentation; Invasive species; Population and resource use growth; Pollution; Climate change; Over-exploitation
Precautionary Principle When substantial preliminary evidence indicates that an activity can harm human health or the environment, we should take measures to prevent such harm, even if some of the cause-and-effect relationships have not been fully established, scientifically. When something indicates that an activity can cause harm to humans or the environment, we should do our best to prevent or reduce such harm, even if all of the possible outcomes have been considered.
Created by: kctwirler1
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