|Conservation Biology Group|
Improving post-fire forest management to promote biodiversity in the Mediterranean ecosystems
The Conservation Biology Group undertook a specific project reported in the European Journal of Wildlife Management, studying the rabbit populations in different areas of the Sant Llorenį del Munt i lObac natural park, which in August 2003 was hit by a forest fire that burned some 4,600 hectares. The basic objective was to study how forest fires and post-fire forest management affected the abundance and recovery of rabbit populations, which is a key species in Mediterranean ecosystems since it is a staple pray for many endangered predators as the Bonellis Eagle.
The Group looked at fifty different plots of land corresponded to one of four different types: natural areas not burned, burned areas where burned branches were left in situ (resulting from the removal of burned wood with a certain commercial value), burned areas where all burned wood was removed, and areas of low vegetation cover before the fire. Interesting results were obtained. In the burned areas, rabbit populations recovered faster and reached high abundances five years after the fires had occurred, far surpassing population numbers in unburned areas. Additionally, in burned areas where the burned branches were removed, rabbit populations grew faster and reached higher abundances than in plots where the burned branches were left on the ground. Finally, close analysis taking into account the different layers of vegetation and burned wood showed a strong negative correlation between the amount of burned wood left on a plot and rabbit abundance and, in contrast, a positive correlation in the case of uncovered soil and the existence of herbs and grasses.
Therefore, this post-fire treatment is not favourable to rabbit abundance. Therefore, removing burned wood left by forest fires could contribute to the recovery of rabbit populations affected by inadequate habitats, viral diseases and overexploitation, and is essential for the conservation of highly endangered species and the future of Mediterranean biodiversity. Furthermore, the application of this technique paves the way for the use of controlled burning as a tool for the improvement and recovery of rabbit populations. Finally, this alternative approach might increase the potential financial returns obtainable from Mediterranean forests, where the value of the wood is very low and could be surpassed by income from hunting.
This study was supported by the Ārea dEspais Naturals de la Diputaciķ de Barcelona and the Cercle dAmics dels Parcs Naturals.
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