Fire structures pine serotiny at different scales.

Details

Serval ID
serval:BIB_6AAE47ECC107
Type
Article: article from journal or magazin.
Collection
Publications
Title
Fire structures pine serotiny at different scales.
Journal
American Journal of Botany
Author(s)
Hernández-Serrano A., Verdú M., González-Martínez S.C., Pausas J.G.
ISSN
1537-2197 (Electronic)
ISSN-L
0002-9122
Publication state
Published
Issued date
2013
Volume
100
Number
12
Pages
2349-2356
Language
english
Abstract
PREMISE OF THE STUDY: Serotiny (delayed seed release with the consequent accumulation of a canopy seedbank) confers fitness benefits in environments with crown-fire regimes. Thus, we predicted that serotiny level should be higher in populations recurrently subjected to crown-fires than in populations where crown-fires are rare. In addition, under a high frequency of fires, space and resources are recurrently available, permitting recruitment around each mother to follow the seed rain shadow. Thus, we also predicted spatial aggregation of serotiny within populations.
METHODS: We compared serotiny, considering both the proportion and the age of serotinous cones, in populations living in contrasting fire regimes for two iconic Mediterranean pine species (Pinus halepensis, P. pinaster). We framed our results by quantitatively comparing the strength of the fire-serotiny relationship with previous studies worldwide.
KEY RESULTS: For the two species, populations living under high crown-fire recurrence regimes had a higher serotiny level than those populations where the recurrence of crown-fires was low. For P. halepensis (the species with higher serotiny), populations in high fire recurrence regimes had higher fine-scale spatial aggregation of serotiny than those inhabiting low fire recurrence systems. The strength of the observed fire-serotiny relationship in P. halepensis is among the highest in published literature.
CONCLUSIONS: Fire regime shapes serotiny level among populations, and in populations with high serotiny, recurrent fires maintain a significant spatial structure for this trait. Consequently, fire has long-term evolutionary implications at different scales, emphasizing its prominent role in shaping the ecology of pines.
Keywords
Biological Evolution, Ecology, Ecosystem, Fires, Mediterranean Region, Pinus/genetics, Pinus/physiology, Plant Development, Seeds, Species Specificity
Pubmed
Web of science
Open Access
Yes
Create date
30/09/2013 9:03
Last modification date
20/08/2019 14:25
Usage data