Genetic variation and biogeographical boundaries within the red alga Porphyra umbilicalis (Bangiales, Rhodophyta)
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Brian W. Teasdale
Abstract
Information about past periods of climate change can provide a framework for investigating how marine communities may have adapted to changes both geographically and ecologically. The spatial distribution of variable haplotypes from the nuclear ribosomal DNA internal transcribed spacer (ITS1-5.8S-ITS2) region and a ribosomal DNA group-I intron from the obligate, rocky shore intertidal red alga Porphyra umbilicalis were used to reconstruct its biogeographical history since the last glacial maximum in the North Atlantic. Haplotype distributions from European and North American samples representing the range of P. umbilicalis are consistent with the hypothesis that North American populations were extirpated during the last glacial maximum and subsequently recolonized from European donor populations. A non-coding intergenic region between the mitochondrial cytochrome oxidase (cox)2 and cox3 genes was also investigated, but because there were extremely low levels of intraspecific variation, the spacer was not useful for phylogeographical analysis.
©2010 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Review
- A review of antihypertensive and antioxidant activities in macroalgae
- Research articles
- Significance of radical oxygen production in sorus development and zoospore germination in Saccharina japonica (Phaeophyceae)
- Genetic variation and biogeographical boundaries within the red alga Porphyra umbilicalis (Bangiales, Rhodophyta)
- First records of Laurencia caduciramulosa and L. minuscula (Ceramiales, Rhodophyta) from the Cuban archipelago
- Restoration of Cymodocea nodosa (Uchria) Ascherson seagrass meadows through seed propagation: seed storage and influences of plant hormones and mineral nutrients on seedling growth in vitro
- Morphological variation of Thalassia testudinum in two shallow coastal environments from the southeastern Gulf of Mexico
- Internal mycobiota of marine macroalgae from the Tamilnadu coast: distribution, diversity and biotechnological potential
- Nitrate reduction by fungi in marine oxygen-depleted laboratory microcosms
