High genetic diversity within but limited differentiation among populations of the vulnerable Guatemalan fir

K. K. Rasmussen, U. Strandby, J. Kollmann

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Genetic diversity in fragmented tree populations may reflect provenance variation and the relationship between genetic diversity and population characteristics should be known to improve conservation strategies. We chose the vulnerable Abies religiosa subsp. mexicana (syn. Abies guatemalensis) to study genetic diversity within and among 18 populations in Guatemala (284 trees, seven microsatellite markers). Genetic diversity was high in all populations (observed heterozygosity = 0.70-0.90), while six populations deviated from Hardy-Weinberg equilibrium. Inbreeding within populations (Fis) was significant in five populations, among them two peripheral populations. A cluster analysis and a principal component analysis (PCA) indicated existence of one large metapopulation with the two peripheral populations as outliers. Longitude, geographic isolation and expected heterozygosity were correlated with the first PCA axis, while altitude was correlated with the second axis. Mountain range, forest size and fitness traits of the provenances were not correlated with genetic diversity. The study indicated that peripheral populations of A. religiosa subsp. mexicana contained unique genetic information which should be included in ex situ conservation programmes, whereas the other populations in Guatemala showed little evidence for inbreeding or genetic erosion. We conclude that fragmented conifer populations can maintain high genetic diversity, while differentiation among populations can be weak.

Original languageEnglish
Pages (from-to)247-259
Number of pages13
JournalJournal of Tropical Forest Science
Volume22
Issue number3
StatePublished - Jul 2010
Externally publishedYes

Keywords

  • Abies religiosa subsp. mexicana (syn. Abies guatemalensis)
  • Fragmentation
  • Gene flow
  • Inbreeding
  • Microsatellite marker
  • Peripheral population

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