Topic: Process of Declaring A Species Extinct
Topic in Syllabus: Ecology & Environment
One of the largest freshwater fish, Chinese paddlefish has been declared extinct in a study published in the journal Science of the Total Environment.
About the “extinct” Chinese paddlefish
- Chinese paddlefish measured up to 7 m in length making it an “iconic species”.
- It dates back 200 million years ago.
- Its ancestral home was the Yangtze River.
Reason for extinction:
Overfishing and Habitat Fragmentation.
Criteria of the red list of the international union for conservation of nature:
- “Extinct in the wild” means a species survives only in a captive environment.
- “Locally extinct” means a species has ceased to exist in a particular area but may exist in other areas.
- “Functionally extinct” means the species continues to exist but it has too few members to enable to reproduce meaningfully enough to ensure survival.
- “Globally extinct”, it means a species has no surviving member anywhere. Such a conclusion is reached when there is no reasonable doubt left that its last member has died.
Process of declaring a species extinct
- Declaring a species extinct is an elaborate process involving:
- A series of exhaustive surveys, which need to be taken at appropriate times, throughout the species’ historic range and over a time-frame that is appropriate to the species’ life cycle and form.
- When these surveys fail to record the existence of any individuals belonging to that species, a species may be presumed to be extinct.
Therefore, Once declared extinct, a species is not eligible for protective measures and conservation funding.
Which of the following pairs is/are correctly matched?
Species IUCN Status
- Chinese paddlefish – Critically Endangered
- Humpback mahseer – Endangered
- Pondicherry Shark – Critically Endangered
Select the answer using the code below:
- (a) 1 and 3
- (b) 2 only
- (c) 3 only
- (d) 2 and 3