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Forests 2017, 8(7), 243; doi:10.3390/f8070243

Predation on Early Recruitment in Mediterranean Forests after Prescribed Fires

1
Higher Technical School of Agricultural and Forestry Engineering, University of Castilla-La Mancha, 02071 Albacete, Spain
2
Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ 85721, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Xavier Úbeda and Timothy A. Martin
Received: 21 April 2017 / Revised: 23 June 2017 / Accepted: 5 July 2017 / Published: 8 July 2017
(This article belongs to the Special Issue Effects of Post-Fire Management Activities on Forests)
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Abstract

Wildfires play a significant role in many different elements of Mediterranean forest ecosystems. In recent years, prescribed fires have started being used more often as a fuel reduction tool, and also as silvicultural treatment to help the regeneration and health improvement of stands. Apart from the fact that fire may alter microsite conditions, very little is known about the impact of prescribed burning on natural regeneration or plant species renewal in Mediterranean pine forests. Likewise, knowledge about the influence of seedling predators on post-fire regeneration is still scarce. In this study, we aimed to compare the effects of seedling predation on recruitment in earlier stages after prescribed burnings in three pine stands in Central Spain: a pure stand of Pinus nigra; a mixed stand of Pinus halepensis and Pinus pinaster and a mixed stand P. nigra with P. pinaster. In situ we superficially sowed seeds from two different species. In the sowing experiment, we tested two different seed provenances (drier and more humid spanish regions) for each species. In all, 60 plots (30 burned, 30 unburned) per site, with 10 seeding units per plot and more than 20,000 seeds, were used in the whole study. Seedling predation was evaluated by replicating the seeding units inside and outside a wire cage as protection for rodents and birds. Our results showed that prescribed fires alter initial seedling predation intensity: predation was significantly higher in the seedlings grown in the plots affected by prescribed fire. The individuals sown before the fire passed showed slightly more predation than those sown after fire passage. Provenances did not appear as an important predation drive. Understanding the role of the predation associated with these treatments can help improve Mediterranean pine forest management. View Full-Text
Keywords: seed emergence; seedling survival; Mediterranean forest; prescribed fires; ecological restoration seed emergence; seedling survival; Mediterranean forest; prescribed fires; ecological restoration
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Sagra, J.; Moya, D.; Plaza-Álvarez, P.A.; Lucas-Borja, M.E.; Alfaro-Sánchez, R.; De Las Heras, J.; Ferrandis, P. Predation on Early Recruitment in Mediterranean Forests after Prescribed Fires. Forests 2017, 8, 243.

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