An endangered species faces a very high risk of extinction in the near future, worldwide or within a particular region. This lesson introduces the meaning of endangerment and the major pressures that can place species at risk.
A species is considered endangered when available evidence indicates a high risk that it will become extinct. Risk may apply across the species' entire range or only in a particular region. A species can disappear from one area while surviving elsewhere; this is called local extinction or extirpation.
All flashcards
What is an endangered species?
A species with a very high risk of extinction in the near future, globally or within a particular region.
What is habitat loss?
The destruction, degradation, or fragmentation of places where a species lives and obtains the resources it needs.
What is genetic variation?
Differences in inherited traits among individuals in a species; this variation can help a population adapt to change.
How can climate change threaten species?
Long-term shifts in temperature, rainfall, and other weather patterns can change ecosystems and make native habitat less suitable.
Why is inbreeding a concern in small populations?
Small populations are more likely to have related individuals breed, which can reduce genetic diversity and potentially weaken resilience.
Quiz questions
Which evidence may be considered in a conservation assessment?Answer: Population trends, breeding success, geographic range, and known threats.
Which IUCN Red List categories are collectively called threatened?Answer: Critically Endangered, Endangered, and Vulnerable.
Under the U.S. Endangered Species Act, what must federal agencies do before actions that could jeopardize protected species?Answer: Consult the appropriate wildlife service about the proposed action.
What is a main purpose of Species Survival Plans established by the Association of Zoos and Aquariums?Answer: Coordinate population management and breeding recommendations for selected species.
What can a species' removal from a threatened-species list indicate?Answer: Its status has improved, but monitoring or legal protection may still be needed.
Based on the Wikipedia article Endangered species, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.