Dr. Kristoffer Hylander och Prof. Johan Ehrlén, at Department of Ecology, Environment and Plant Science, Stockholm University, has recently published a paper in the journal Trends in Ecology and Evolution. The paper discusses how mechanisms at the level of individuals, populations and meta-populations all can give rise to extinction debts. They also stress the importance of considering both the size of the extinction debt and its' relaxation time.

Hylander, K. & Ehrlén, J. 2013. The mechanisms causing extinction debts.
Trends in Ecology and Evolution.