24 Questions
What is the primary cause of higher extinction rates?
Habitat loss
What is the main cause of endangered species?
Habitat loss
What is an example of an endangered species?
Javan Rhinos
What is the most critically endangered species?
Amur Leopard
How many species are endangered?
Over 157,100 species
What percentage of amphibians are threatened with extinction?
41%
What is the difference between critically endangered and endangered species?
Critically endangered species are at a higher risk of extinction
What is the main cause of species extinction in prehistoric times?
All of the above
What is the primary definition of an endangered species?
A species that is considered to be at risk of extinction
Why do animals usually become endangered?
Due to over hunting or destruction of their habitat
What is the primary goal of evaluating endangered species?
To synthesize and analyze scientific information on a species' or stock's population structure
What does 'threatened' mean in the context of the Endangered Species Act?
A species that is likely to become endangered within the foreseeable future
What is one of the five criteria to access the extinction risk of various species?
The rate of population decline
What is the main cause of endangered species according to the text?
Human activities
What is the purpose of identifying endangered species?
To evaluate the threats caused by human activities
What does 'endangered' mean in the context of the Endangered Species Act?
A species that is in danger of extinction throughout all or a significant portion of its range
What is the criteria for a species to be classified as endangered?
A population decline of at least 20 percent within five years or two generations
What is the main cause of species endangerment?
Habitat loss
What is the purpose of CITES?
To regulate or ban international trade in endangered species
What is the definition of 'wildlife' according to CITES?
All fauna and flora
What is the difference between vulnerable and endangered species?
Vulnerable species are at high risk of extinction, while endangered species are at very high risk
What is one way to save endangered animals?
Making cities more wildlife friendly
What is the criteria for a species to be classified as least concern?
A population that does not qualify for a higher risk category
What is the purpose of conserving endangered species?
To preserve biodiversity and ecosystems
Study Notes
What is an Endangered Species?
- An endangered species is an animal or plant that is at risk of extinction, with only a few individuals left on Earth.
- Endangered species are those that are not doing well, often due to overhunting or habitat destruction.
Evaluating Endangered Species
- Endangered species assessments consider a species' population structure, life history characteristics, abundance, and threats caused by human activities.
Identification of Endangered Species
- Under the Endangered Species Act (ESA), species can be listed as endangered or threatened.
- Endangered means a species is in danger of extinction throughout its range, while threatened means it is likely to become endangered in the near future.
Criteria to Access Extinction Risk
- The five criteria to assess extinction risk include:
- Rate of population decline
- Geographic range
- Small population size
- Restricted area or small range
- High probability of extinction in the wild
Main Cause of Endangered Species
- Habitat loss is the primary cause of higher extinction rates.
- Other causes include habitat changes, over-exploitation, introduction of non-native species, pollution, and disease spread.
Examples of Endangered Species
- Javan Rhinoceros: only around 75 individuals remaining on the island of Java, Indonesia.
- Amur Leopard: fewer than 92 individuals remaining in their natural range.
Listing Endangered Species
- Over 157,100 species are listed on the IUCN Red List, with over 44,000 species threatened with extinction.
Critically Endangered and Endangered Species
- Critically Endangered (CR): extremely high risk of extinction in the wild.
- Endangered (EN): high risk of extinction in the wild.
- Vulnerable (VU): high risk of endangerment in the wild.
Saving Endangered Animals
- Measures to save endangered animals include:
- Reducing food waste and consumption
- Making cities more wildlife-friendly
- Controlling cat populations
- Protecting forests and habitats
- Conserving endangered species
CITES
- CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) regulates or bans international trade in endangered species.
- "Wildlife" includes all fauna and flora, and CITES addresses both legal and illegal trade.
Learn about the definition and meaning of endangered species, why animals become endangered, and more in this quiz based on Chapter 6 of your biology textbook.
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