OMG SHARKS.com - Your Source for SHARKS

ENDANGERED SHARK

Shark News

Types of Sharks

Prehistoric Extinct Sharks

Shark Attacks

SHARK CHAT FORUM

Shark Movies

Shark Diving

Shark Books

Shark Teeth

Shark Toys

Shark Posters

Shark Pictures

Endangered Sharks

Shark Facts

Sponsors

Contact Us

Advertise

 

 

CATEGORIES EXPLAINED

by IUCN
( International Union for Conservation of Nature )

 

EXTINCT
A Shark is Extinct when there is no reasonable doubt that the last individual has died. A Shark is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the Shark's life cycle and life form.

EXTINCT IN THE WILD
A Shark is Extinct in the Wild when it is known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range. A Shark is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the Shark's life cycle and life form.


CRITICALLY ENDANGERED
A Shark is Critically Endangered when the best available evidence indicates that it meets any of the criteria A to E for Critically Endangered , and it is therefore considered to be facing an extremely high risk of extinction in the wild.


ENDANGERED
A Shark is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Section V), and it is therefore considered to be facing a very high risk of extinction in the wild.


VULNERABLE
A Shark is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable, and it is therefore considered to be facing a high risk of extinction in the wild.

NEAR THREATENED
A Shark is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.


LEAST CONCERN
A Shark is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread and abundant Sharks are included in this category.
 

DATA DEFICIENT ( NO DATA )
A Shark is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A Shark in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of Sharks in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a Shark is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the Shark, threatened status may well be justified.

 

 

 

Shark News

Types of Sharks

Prehistoric Extinct Sharks

Shark Attacks

SHARK CHAT FORUM

Shark Movies

Shark Diving

Shark Books

Shark Teeth

Shark Toys

Shark Posters

Shark Pictures

Endangered Sharks

Shark Facts

Sponsors

Contact Us

Advertise

 

 
 

 

   

Copyright 2012 OMG Sharks C26 Web,  All rights reserved.