Historical and contemporary mating patterns in remnant populations of the forest tree Fraxinus excelsior L.

Bacles, Cecile F. E., Burczyk, J., Lowe, Andrew J. and Ennos, R. A. (2005) Historical and contemporary mating patterns in remnant populations of the forest tree Fraxinus excelsior L.. Evolution, 59 5: 979-990. doi:10.1554/04-653

Author Bacles, Cecile F. E.
Burczyk, J.
Lowe, Andrew J.
Ennos, R. A.
Title Historical and contemporary mating patterns in remnant populations of the forest tree Fraxinus excelsior L.
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
Publication date 2005-05
Sub-type Article (original research)
DOI 10.1554/04-653
Volume 59
Issue 5
Start page 979
End page 990
Total pages 12
Editor D.M. Waller
Place of publication Lancaster, Pa., U.S.A.
Publisher Society for the Study of Evolution
Collection year 2005
Language eng
Subject C1
270203 Population and Ecological Genetics
770706 Remnant vegetation and protected conservation areas
0603 Evolutionary Biology
Abstract Genetic variation at microsatellite markers was used to quantify genetic structure and mating behavior in a severely fragmented population of the wind-pollinated, wind-dispersed temperate tree Fraxinus excelsior in a deforested catchment in Scotland. Remnants maintain high levels of genetic diversity, comparable with those reported for continuous populations in southeastern Europe, and show low interpopulation differentiation (Theta = 0.080), indicating that historical gene exchange has not been limited (Nm = 3.48). We estimated from seeds collected from all trees producing fruits in three of five remnants that F. excelsior is predominantly outcrossing (t(m). = 0.971 +/- 0.028). Use of a neighborhood model approach to describe the relative contribution of local and long-distance pollen dispersal indicates that pollen gene flow into each of the three remnants is extensive (46-95%) and pollen dispersal has two components. The first is very localized and restricted to tens of meters around the mother trees. The second is a long-distance component with dispersal occurring over several kilometers. Effective dispersal distances, accounting for the distance and directionality to mother trees of sampled pollen donors, average 328 m and are greater than values reported for a continuous population. These results suggest that the opening of the landscape facilitates airborne pollen movement and may alleviate the expected detrimental genetic effects of fragmentation.
Keyword Ecology
Evolutionary Biology
Genetics & Heredity
Effective Pollen Dispersal
Fragmented Landscape
Fraxinus Excelsior L.
Neighborhood Model
Common Ash
Pollen Dispersal
Fragmented Populations
Habitat Fragmentation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2006 Higher Education Research Data Collection
School of Biological Sciences Publications
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Created: Wed, 15 Aug 2007, 05:25:47 EST