RAPD analysis of genetic variation and dispersal of the moss Bryum pseudotriquetrum from Southern Victoria Land, Antarctica

The RAPD technique (Random Amplified Polymorphic DNA) was used to assess the level of genetic diversity in Bryum pseudotriquetrum from Southern Victoria Land, Antarctica. Isolates were collected from two transects, and from several other geographically distinct populations within 150 km of Ross Isla...

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Bibliographic Details
Published in:Polar Biology
Main Authors: Skotnicki, M. L., Selkirk, P. M., Ninham, J. A.
Format: Article in Journal/Newspaper
Language:English
Published: 1998
Subjects:
Antarctic
Victoria Land
Ross Island
Granite Harbour
Cape Chocolate
Antarc*
Antarctica
Polar Biology
Online Access:https://researchers.mq.edu.au/en/publications/7c2938be-8316-4492-a8dd-1e184584b9e5
https://doi.org/10.1007/s003000050285
http://www.scopus.com/inward/record.url?scp=0031904543&partnerID=8YFLogxK
Description
Summary:The RAPD technique (Random Amplified Polymorphic DNA) was used to assess the level of genetic diversity in Bryum pseudotriquetrum from Southern Victoria Land, Antarctica. Isolates were collected from two transects, and from several other geographically distinct populations within 150 km of Ross Island. Moss growth in one transect, sampled down a small exposed meltstream channel at Cape Chocolate, was very sparse with no other moss colonies found within several hundred meters. Isolates from this transect showed low levels of genetic variation, with many moss clumps appearing identical; these were probably dispersed by water along the channel. In another transect analysed from Granite Harbour, the moss colonies were large, luxuriant and protected by boulders. These isolates showed considerably higher levels of genetic variability than the Cape Chocolate samples, and both within- and between-clump variation was observed. Samples from other sites showed varying levels of genetic diversity. It appears from these results that the degree of protection from the harsh Antarctic environment can influence not only the type of moss growth, but also the level of genetic diversity. Evidence is presented for both short-distance dispersal by water and long-distance dispersal by wind.

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