![Multiscale model of regional population decline in little brown bats due to white‐nose syndrome](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2019/08/Geomyces_destructans_1-470x140.jpg)
The introduced fungal pathogen Pseudogymnoascus destructans causes White-nose syndrome in North American bats, putting some populations at risk for extinction or extirpation. The severity of…
![Factors influencing the detectability of early warning signals of population collapse](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2015/05/daphnia-magna1-470x140.png)
Early warning signals of critical transitions arise due to critical slowing down as a dynamical system approaches a tipping point. Extinction of a biological population…
![Phase transitions in salmon population dynamics](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2014/04/armstrong-salmon-470x140.jpeg)
Early warning signals for critical transitions have now been described from a number of ecological and geophysical systems. Most of these signals reflect a dynamical…
![Are extinction time distributions scale free?](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2014/02/daphnia-pulicaria-258x140.png)
What is the shape of the probability distribution of population extinction times? We followed the dynamics of more than a thousand experimental populations of Daphnia…
![Timescales of extinction over a patch size gradient](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/longtubes_shadow-470x140.png)
Background Theory predicts that the logarithm of mean extinction times will scale with patch carrying capacity. Although previous results are consistent with this theory over…
![Distribution of extinction times](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/DPu-tubes_shadow-470x140.png)
Background Few experimental or observational datasets are available from which to learn about the stochastic properties of extinction. Particularly, there have been no large studies…
![Extinction in variable environments](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/DE1-chambers_shadow-470x140.png)
Background. Theory predicts that extinction rates should be lower in constant environments than in randomly fluctuating environments with the same average conditions. This is because…
![Metapopulation dynamics](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/07/metapop_shadow-430x140.png)
It is well understood that natural populations do not necessarily reflect the assumption of a homogeneous well-mixed population assumed by most of theories of population…
![Doubly-regulated populations](https://daphnia.ecology.uga.edu/drakelab/wp-content/uploads/2013/09/Daphnia_magna011-240x140.jpg)
Background. Population persistence is predicted by theory to increase with carrying capacity and a population’s capacity to increase rapidly. We view both carrying capacity and…