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Questions and Answers
According to the IUCN Red List criteria, which factor is considered when classifying a species as 'Endangered'?
According to the IUCN Red List criteria, which factor is considered when classifying a species as 'Endangered'?
- The political influence of the country where the species is located.
- The species' aesthetic appeal to humans.
- The number of zoos that house the species.
- A population decline between 50 and 70 percent over 10 years. (correct)
A species is observed to have a rapidly shrinking habitat due to deforestation. How does the IUCN Red List use 'geographic range' to determine if it should be classified as 'Endangered'?
A species is observed to have a rapidly shrinking habitat due to deforestation. How does the IUCN Red List use 'geographic range' to determine if it should be classified as 'Endangered'?
- If its area of occupancy is estimated to be less than 500 square kilometers. (correct)
- If the species lives in a forest.
- If the forest is publicly or privately owned.
- If its area of occupancy is estimated to be more than 1000 square kilometers.
Which population size would classify a species as 'Endangered' according to the IUCN Red List?
Which population size would classify a species as 'Endangered' according to the IUCN Red List?
- More than 10,000 mature individuals.
- Exactly 5,000 mature individuals.
- Fewer than 2,500 mature individuals. (correct)
- Between 5,000 and 7,500 mature individuals.
A species with a population of 3000 mature individuals experiences a decline of 25% over four years. According to the IUCN criteria, how would this information be used to classify the species?
A species with a population of 3000 mature individuals experiences a decline of 25% over four years. According to the IUCN criteria, how would this information be used to classify the species?
A conservation group claims a species is endangered solely because its population is declining rapidly. What additional information is needed to substantiate this claim according to IUCN Red List criteria?
A conservation group claims a species is endangered solely because its population is declining rapidly. What additional information is needed to substantiate this claim according to IUCN Red List criteria?
How does the IUCN Red List ensure consistency and objectivity when classifying species into different conservation levels?
How does the IUCN Red List ensure consistency and objectivity when classifying species into different conservation levels?
If a newly discovered species has a very limited geographic range and is only found in a small, fragmented habitat, which IUCN Red List criterion would be most relevant in assessing its conservation status?
If a newly discovered species has a very limited geographic range and is only found in a small, fragmented habitat, which IUCN Red List criterion would be most relevant in assessing its conservation status?
A fish species is found to have a population decline from 10,000 to 4,000 mature individuals over 10 years due to overfishing. Which IUCN criterion applies, and what is the implication for its classification?
A fish species is found to have a population decline from 10,000 to 4,000 mature individuals over 10 years due to overfishing. Which IUCN criterion applies, and what is the implication for its classification?
A small island bird species has a stable population of 3,000 individuals but is threatened by a new invasive predator that is expected to cause a rapid decline. Which IUCN Red List criteria should be proactively monitored to assess the species' future conservation status?
A small island bird species has a stable population of 3,000 individuals but is threatened by a new invasive predator that is expected to cause a rapid decline. Which IUCN Red List criteria should be proactively monitored to assess the species' future conservation status?
A conservation biologist is trying to determine whether a plant species qualifies as 'Endangered' according to the IUCN Red List. They have data showing a habitat loss of 60% over the past decade, but no reliable information on population size. What should be the next step in the assessment process?
A conservation biologist is trying to determine whether a plant species qualifies as 'Endangered' according to the IUCN Red List. They have data showing a habitat loss of 60% over the past decade, but no reliable information on population size. What should be the next step in the assessment process?
Flashcards
IUCN Red List
IUCN Red List
A system that assesses the extinction risk of species, categorizing them into levels like Vulnerable, Endangered, and Extinct.
Endangered Species
Endangered Species
A species at high risk of extinction. Populations have declined between 50 and 70 per cent.
Endangered Geographic Range
Endangered Geographic Range
One criterion for classifying a species as endangered. Area of occupancy is less than 500 square kilometers.
Endangered Population Size
Endangered Population Size
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Study Notes
- The International Union for Conservation of Nature (IUCN) Red List classifies species into seven conservation levels.
- These levels are Least Concern, Near Threatened, Vulnerable, Endangered, Critically Endangered, Extinct in the Wild, and Extinct.
- The IUCN Red List employs specific criteria to assess extinction risks.
- The assessment determines which species require protection measures.
- A species qualifies as endangered if it meets certain criteria related to population decline.
- A species qualifies as endangered if it meets certain criteria related to geographic range.
- A species qualifies as endangered if it meets certain criteria related to population size.
Population Reduction Rate
- A species is classified as endangered when its population has declined between 50 and 70 percent.
- This decline is measured over a period of 10 years or longer.
Geographic Range
- Geographic range refers to the area where a species is found.
- If a species' area of occupancy is estimated to be less than 500 square kilometers, it is classified as endangered.
Population Size
- A species is classified as endangered with fewer than 2,500 mature individuals.
- A species is classified as endangered when its population declines by at least 20 percent, or two generations, within a 5 year period.
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