Genetic conservation of Parashorea malaanonan (M. Blanco) Merr. in Mt. Makiling, Laguna, Philippines
2006
Gamboa-Lapitan, Portia | Jung, Oh Hyun
The genetic diversity of P. malaanonan was previously assessed from isozyme analysis of 61 individuals spread in two elevational sites within Mt. Makiling Forest Reserve (MFR) to identify conservation strategies for the population in this forest. The genetic diversity as indicated by observed heterozygosity (Ho) was found to be directly proportional to the species’ outcrossing rate. Comparison of F values of the adult (-0.200 to –0.068) and filial population (0.010) revealed that selection in favour of heterozygotes occurred in the population. The number of seedlings surviving from a given crop decreased through time. Considering this information, the most appropriate and cost-effective conservation strategy for the species is the immediate in situ conservation of P. malaanonan in the MFR. P. malaanonan’s resources in the area are well protected and are accessible therefore interventions for enhanced reproductive efficiency and effective conservation of the species is technically possible and economically feasible. The recommended interventions are: 1) “rescue” of randomly selected seedlings to increase survival of progenies and increase further the level of diversity in the area, 2) active management for enhanced seed production and reproductive success of selected mother trees and their use as seed sources for enrichment planting in the reserve and for future plantation establishment in other areas, and 3) protection from Swietenia macrophylla, which is reported to have become an invasive species in Mt. Makiling.
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