![Extinction in deteriorating environments](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/compositeIndex_shadow_sm-298x140.png)
Above – A composite early warning index comprising all four indicators is highly sensitive to the onset of critical slowing down. a, Time-specific calculations of…
![Two-phase extinction hazard](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/11/Daphnia_magna_750-380-470x140.png)
One of the interesting things about the theory of population extinction is that despite widely differing processes for the cause of extinction (demographic stochasticity, environmental…
![Gypsy moth invasion and the Allee Effect](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/gypsy-map2-470x140.png)
Background A partial differential equation model of population growth and dispersal developed by Lewis and Karieva (1993) predicts that invading populations subject to an Allee…
![Extinction due to a predator-driven Allee effect](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/11/chaoborus3-470x140.png)
Background. Recent studies on animal populations in the field have attributed positive-density dependence at low density to a predator-driven Allee effect (e.g. Wittmer et al….