 |
| Titel |
Spatial genetic structure of the sea sandwort (Honckenya peploides) on Surtsey: an immigrant's journey |
| VerfasserIn |
S. H. Árnason, Ǽ. Th. Thórsson, B. Magnusson, M. Philipp, H. Adsersen, K. Anamthawat-Jónsson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 22 ; Nr. 11, no. 22 (2014-11-29), S.6495-6507 |
| Datensatznummer |
250117698
|
| Publikation (Nr.) |
 copernicus.org/bg-11-6495-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Sea sandwort (Honckenya peploides) was one of the first plants to successfully colonize and
reproduce on the volcanic island Surtsey, formed in 1963 off the southern
coast of Iceland. Using amplified fragment length polymorphic (AFLP) markers,
we examined levels of genetic variation and differentiation among
populations of H. peploides on Surtsey in relation to populations on the nearby island
Heimaey and from the southern coast of Iceland. Selected populations from
Denmark and Greenland were used for comparison. In addition, we tested
whether the effects of isolation by distance could be seen in the Surtsey
populations. Using two primer combinations, we obtained 173 AFLP markers
from a total of 347 plant samples. The resulting binary matrix was then
analysed statistically. The main results include the following: (i) Surtsey had
the highest proportion of polymorphic markers as well as a comparatively
high genetic diversity (55.5% proportion of polymorphic loci, PLP; 0.1974 HE) and Denmark the lowest
(31.8% PLP; 0.132 HE), indicating rapid expansion during an early
stage of population establishment on Surtsey and/or multiple origins of
immigrants; (ii) the total genetic differentiation (FST) among Surtsey
(0.0714) and Heimaey (0.055) populations was less than half of that found
among the mainland populations in Iceland (0.1747), indicating substantial
gene flow on the islands; (iii) most of the genetic variation (79%, p < 0.001) was found within localities, possibly due to the
outcrossing and subdioecious nature of the species; (iv) a significant genetic
distance was found within Surtsey, among sites, and this appeared to
correlate with the age of plant colonization; and (v) the genetic structure
analysis indicated multiple colonization episodes on Surtsey, whereby H. peploides most
likely immigrated from the nearby island of Heimaey and directly from the
southern coast of Iceland. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|