Threatened Species Management System – Listing Recommendations and Criteria

June 2011

Species recommended for listing as threatened (40)

Species recommended for removal from the list (16) 

*Keys species only

Species recommended as SSC (5)

Eastern chipmunk
Harlequin darter
Homosassa shrew
Osprey (southern coastal population)
Sherman's fox squirrel

FWC criteria for listing

Listing criteria evaluate risk of extinction through the following biological indicators of populations that are threatened with extinction:

• Rapidly declining population in past, present or future
• Restricted geographic range and critical habitat
• Small population size
• Model indicating risk of extinction >10 percent in 100 years
• Fluctuations in population or fragmentation

 Specifically the criteria are:

1. Population decline of 50 percent or greater in the past where causes of the decline have stopped, OR
   Declines of 30 percent in past, present or future three generations or 10 years, whichever is longer.
2. Range is less than 7,722 square miles, OR
   The critical habitat (area of occupancy) is less than 772 square miles, AND
   Two of the following:
   • Population severely fragmented
   • Continuing decline in habitat and numbers of populations or mature individuals
   • Extreme fluctuations in habitat, numbers of populations or mature individuals
3. Population estimated to number fewer than 10,000 mature individuals, AND
   
   • Either a continuing decline of 10 percent of the population; OR
   • Continuing decline and at least one of
     
     • small subpopulations (<1,000) or all individuals in one location; OR
     • extreme fluctuations in number of individuals
4. Population estimated to contain fewer than 1,000 individuals, OR
   Occupies less than 8 square miles
5. Model showing the probability of extinction is at least 10 percent within 100 years. 

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