---
title: Australian mathematicians say some endangered species "not worth saving"
date: 2011-04-14T19:24:22Z
modified: 2011-04-14T19:24:22Z
permalink: "https://nko.org/australian-mathematicians-endangered-species-worth-saving/"
type: post
status: publish
excerpt: ""
wpid: 960
categories:
  - Environment
tags:
  - Environment
  - conservation
  - endangered species
  - James Cook University
  - point of no return
  - tipping point
  - University of Adelaide
author: Paul Garrett Hugel
timestamp: 2011-04-14T19:24:22Z
---

## Australian mathematicians say some endangered species “not worth saving”

By [John Platt](http://www.scientificamerican.com/blog/extinction-countdown/index.cfm?author=1860) | Apr 14, 2011 02:55 PM | [0](http://www.scientificamerican.com/blog/post.cfm?id=australian-mathematicians-say-some-2011-04-14#comments "comments on this blog post")

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![](http://www.scientificamerican.com/media/inline/blog/Image/04-13-kakapo.jpg)

Some endangered species on the brink of extinction might not be worth saving, according to a new algorithm developed by researchers at the University of Adelaide and James Cook University, both in Australia.

Dubbed the SAFE (species’ ability to forestall extinction) index, the formula takes current and minimum viable population sizes into account to determine if it is too costly to save a species from extinction. The research was published online March 30 in the journal _Frontiers in Ecology and the Environment._

Co-author [Corey Bradshaw](http://www.adelaide.edu.au/environment/people/coreybradshaw.html), director of ecological modeling at the University of Adelaide’s Environment Institute, said in a prepared [statement](http://www.sciencedaily.com/releases/2011/04/110407101615.htm) that the formula is “the best predictor yet of the vulnerability of mammal species to extinction.”

The study examined 95 mammal species, 20 percent of which are endangered and 10 of which are on what the authors call “the tipping point” where they could be at the “point of no return.” That tipping point, according to the authors, is a species with a population below 5,000 individuals.

_Photo: The critically endangered kakapo (_Strigops habroptila_) by Brent Barrett via_ [Flickr](http://www.flickr.com/photos/whereisbrent/113100688/) _under Creative Commons License_

_[Read entire story at Scientific American](http://www.scientificamerican.com/blog/post.cfm?id=australian-mathematicians-say-some-2011-04-14)_

## Topics

**Categories:** [Environment](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/category/environment.md)

**Tags:** [conservation](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/conservation.md), [endangered species](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/endangered-species.md), [James Cook University](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/james-cook-university.md), [point of no return](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/point-of-no-return.md), [tipping point](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/tipping-point.md), [University of Adelaide](https://nko.org/wp-content/uploads/wp-mfa-exports/taxonomy/post_tag/university-of-adelaide.md)