Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Genetic effects of chronic habitat fragmentation on tree species: the case of Sorbus aucuparia in a defrosted Scottish landscape.|
|Citation:||Molecular Ecology, 2004; 13(3):573-584|
|Publisher:||Blackwell Publishing Ltd|
|C. F. E. Bacles, A. J. Lowe, R. A. Ennos|
|Abstract:||Sustainable forest restoration and management practices require a thorough understanding of the influence that habitat fragmentation has on the processes shaping genetic variation and its distribution in tree populations. We quantified genetic variation at isozyme markers and chloroplast DNA (cpDNA), analysed by polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP) in severely fragmented populations of Sorbus aucuparia (Rosaceae) in a single catchment (Moffat) in southern Scotland. Remnants maintain surprisingly high levels of gene diversity (HE) for isozymes (HE = 0.195) and cpDNA markers (HE = 0.490). Estimates are very similar to those from non-fragmented populations in continental Europe, even though the latter were sampled over a much larger spatial scale. Overall, no genetic bottleneck or departures from random mating were detected in the Moffat fragments. However, genetic differentiation among remnants was detected for both types of marker (isozymes Θn = 0.043, cpDNA Θc = 0.131; G-test, P-value < 0.001). In this self-incompatible, insect-pollinated, bird-dispersed tree species, the estimated ratio of pollen flow to seed flow between fragments is close to 1 (r = 1.36). Reduced pollen-mediated gene flow is a likely consequence of habitat fragmentation, but effective seed dispersal by birds is probably helping to maintain high levels of genetic diversity within remnants and reduce genetic differentiation between them.|
|Keywords:||cpDNA; isozymes; F -statistics; habitat fragmentation; pollen vs. seed migration; Sorbus aucuparia L|
|Description:||The definitive version is available at www.blackwell-synergy.com|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute Leaders publications
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.