Evaluating the legacy of landscape history: extinction debt and species credit in bird and small mammal assemblages in the Brazilian Atlantic Forest
Article first published online: 29 NOV 2012
© 2012 The Authors. Journal of Applied Ecology © 2012 British Ecological Society
Journal of Applied Ecology
Volume 49, Issue 6, pages 1325–1333, December 2012
How to Cite
Lira, P. K., Ewers, R. M., Banks-Leite, C., Pardini, R., Metzger, J. P. (2012), Evaluating the legacy of landscape history: extinction debt and species credit in bird and small mammal assemblages in the Brazilian Atlantic Forest. Journal of Applied Ecology, 49: 1325–1333. doi: 10.1111/j.1365-2664.2012.02214.x
- Issue published online: 29 NOV 2012
- Article first published online: 29 NOV 2012
- Manuscript Accepted: 7 SEP 2012
- Manuscript Received: 23 MAY 2012
- Instituto de Biociências/USP
- Imperial College London
- extinction threshold;
- habitat fragmentation;
- habitat loss;
- habitat regeneration;
- landscape connectivity;
- landscape dynamics;
- landscape structure
There is now an extensive literature on extinction debt following deforestation. However, the potential for species credit in landscapes that have experienced a change from decreasing to expanding forest cover has received little attention. Both delayed responses should depend on current landscape forest cover and on species life-history traits, such as longevity, as short-lived species are likely to respond faster than long-lived species.
We evaluated the effects of historical and present-day local forest cover on two vertebrate groups with different longevities – understorey birds and non-flying small mammals − in forest patches at three Atlantic Forest landscapes. Our work investigated how the probability of extinction debt and species credit varies (i) amongst landscapes with different proportions of forest cover and distinct trajectories of forest cover change, and (ii) between taxa with different life spans.
Our results suggest that the existence of extinction debt and species credit, as well as the potential for their future payment and/or receipt, is not only related to forest cover trajectory but also to the amount of remaining forest cover at the landscape scale. Moreover, differences in bird and small mammal life spans seem to be insufficient to affect differently their probability of showing time-delayed responses to landscape change.
Synthesis and applications. Our work highlights the need for considering not only the trajectory of deforestation/regeneration but also the amount of forest cover at landscape scale when investigating time-delayed responses to landscape change. As many landscapes are experiencing a change from decreasing to expanding forest cover, understanding the association of extinction and immigration processes, as well as their interactions with the landscape dynamic, is a key factor to plan conservation and restoration actions in human-altered landscapes.