Immediate effects of selective logging on Shorea Curtisii

Ho W.S., . and Wickneswari R., . and Mahani M.C., . and Shukor M.N., . and Haron Abu Hassan, . and Che Ros A., . (2004) Immediate effects of selective logging on Shorea Curtisii. [Proceedings Paper]

Immediate effects of a single selective logging event on the genetic diversity of Shorea Curtisii at different age cohorts viz. seedlings saplings and adult trees were determined using six simple sequence repeats SSRs or microsatellites loci. A total of 110 and 85 samples of S. curtisii were collcted before and immediately after logging in Compartment 118 Ulu Sedili Forest Reserve Johor Malaysia. The reduction in genetic diversity for seedlings and adult trees was 6.0 and 26.3 respectively. Meanwhile the genetic diversity for saplings was unchanged after a single selective logging event. Hypothetical multilocus gemetic diversity which is a measure of producing genetically diverse gametes when mature was reduced by about 35 seedlings and saplings after logging. Hypothetical multilocus gametic diversity and latent genetic adaptive potential of the adult trees decreased to about 85 suggesting that the ability of this gene pool to adapt to changing environmental conditions may have been compromised. In contrast the latent genetic adaptive potential increased in the saplings by about 72 after logging. This suggests that saplings have the capability to colonise or adapt to environmental changes in the long-term. Analysis of genotype arrays of seedlings and saplings in Compartment 118 showed that about 40 and 35 of the genotypes detected in before and after logging samples respectively most probably originated from adult trees outside the compartment. Therefore it is crucial to have adequate buffer zones whilst at the same time leaving behind sufficient undamage good quality adolescent or bigger trees to ensure good regeneration in the residual stands.

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Abstract

Immediate effects of a single selective logging event on the genetic diversity of Shorea Curtisii at different age cohorts viz. seedlings saplings and adult trees were determined using six simple sequence repeats SSRs or microsatellites loci. A total of 110 and 85 samples of S. curtisii were collcted before and immediately after logging in Compartment 118 Ulu Sedili Forest Reserve Johor Malaysia. The reduction in genetic diversity for seedlings and adult trees was 6.0 and 26.3 respectively. Meanwhile the genetic diversity for saplings was unchanged after a single selective logging event. Hypothetical multilocus gemetic diversity which is a measure of producing genetically diverse gametes when mature was reduced by about 35 seedlings and saplings after logging. Hypothetical multilocus gametic diversity and latent genetic adaptive potential of the adult trees decreased to about 85 suggesting that the ability of this gene pool to adapt to changing environmental conditions may have been compromised. In contrast the latent genetic adaptive potential increased in the saplings by about 72 after logging. This suggests that saplings have the capability to colonise or adapt to environmental changes in the long-term. Analysis of genotype arrays of seedlings and saplings in Compartment 118 showed that about 40 and 35 of the genotypes detected in before and after logging samples respectively most probably originated from adult trees outside the compartment. Therefore it is crucial to have adequate buffer zones whilst at the same time leaving behind sufficient undamage good quality adolescent or bigger trees to ensure good regeneration in the residual stands.

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Item Type:	Proceedings Paper
Additional Information:	4 ills. 30 refs.
AGROVOC Term:	FORESTRY
AGROVOC Term:	WOOD
AGROVOC Term:	TIMBER TREES
AGROVOC Term:	LOGGING
AGROVOC Term:	GENETIC RESOURCES
AGROVOC Term:	MICROSATELLITES
AGROVOC Term:	REGENERATION
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16709

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