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GENETIC AND MORPHOLOGICAL ANALYSES OF THE SOUTHERN BULL KELP DURVILLAEA ANTARCTICA (PHAEOPHYCEAE: DURVILLAEALES) IN NEW ZEALAND REVEAL CRYPTIC SPECIES1
Article first published online: 26 MAR 2009
© 2009 Phycological Society of America
Journal of Phycology
Volume 45, Issue 2, pages 436–443, April 2009
How to Cite
Fraser, C. I., Hay, C. H., Spencer, H. G. and Waters, J. M. (2009), GENETIC AND MORPHOLOGICAL ANALYSES OF THE SOUTHERN BULL KELP DURVILLAEA ANTARCTICA (PHAEOPHYCEAE: DURVILLAEALES) IN NEW ZEALAND REVEAL CRYPTIC SPECIES. Journal of Phycology, 45: 436–443. doi: 10.1111/j.1529-8817.2009.00658.x
Received 30 December 2007. Accepted 13 October 2008.
- Issue published online: 6 APR 2009
- Article first published online: 26 MAR 2009
Vol. 45, Issue 3, 786, Article first published online: 8 MAY 2009
- bull kelp;
- cryptic species;
- Durvillaea antarctica;
Many macroalgae exhibit considerable intraspecific morphological variation, but whether such variation reflects phenotypic plasticity or underlying genetic differences is often poorly understood. We quantified both morphological and genetic variation of 96 plants from seven field sites across eastern South Island, New Zealand, to assess genetic differences between morphotypes of the southern bull kelp Durvillaea antarctica (Cham.) Har. Consistent DNA sequence differentiation across mitochondrial, plastid, and nuclear loci was correlated with two broadly sympatric morphotypes: “cape” and “thonged.” These ecologically, morphologically, and genetically distinct bull-kelp lineages were previously considered to be environmentally determined phenotypes with no underlying genetic basis. Interestingly, the sheltered “cape” lineage appears essentially genetically uniform across its South Island range, whereas the exposed “thonged” lineage exhibits marked phylogeographic structure across its range. Results suggest that D. antarctica in New Zealand comprises two reproductively isolated species.