Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 420:103-112 (2010) - DOI: https://doi.org/10.3354/meps08893 Genetic structure of the giant kelp Macrocystis pyrifera along the southeastern Pacific E. C. Macaya1,2,*, G. C. Zuccarello1 1School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand 2Present address: Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile *Email: erasmomacaya@udec.cl ABSTRACT: We assessed the genetic structure of the giant kelp Macrocystis pyrifera across a broad latitudinal range along the southeastern Pacific coast (SEP). Specifically we analyzed the concordance of putative biogeographic breaks with genetic discontinuities and the effect of historical and contemporary events on the genetic pattern of this important seaweed. Mitochondrial DNA and single-strand DNA conformation polymorphism (SSCP) analysis for a total of 730 samples were carried out. Only 5 haplotypes were found among individuals collected along 4800 km of coastline, with very low haplotype diversity and a shallow genealogy compared with other macroalgal species. Some phylogeographic disjunctions in M. pyrifera were found to correspond roughly to established biogeographic breaks. On the southern coast we found a genetic break at 42°S (Chiloé Island) coincident with a well-known biogeographic boundary, while the genetic break found between samples in central/northern Chile (33°S) does not correspond to any known biogeographic breaks in other brown algae, but does reflect a break associated with other marine taxa. The low genetic diversity in northern Chile may be related to contemporary events (e.g. El Niño Southern Oscillation) while in southern Chile the haplotype distribution may reflect the effect of historical events (Last Glacial Maximum; LGM). Additionally, we compared the SEP data with samples from some of the subantarctic islands and New Zealand. The results showed shared haplotypes among some of the subantarctic islands and southern-central Chile, suggesting a recent colonization of the subantarctic region. The high dispersal potential of kelp rafts may also help to explain the low genetic diversity observed. We conclude that both present and historic events are responsible for the genetic structure of M. pyrifera along the SEP. KEY WORDS: Dispersal · Biogeography · ENSO · Kelp · Macrocystis pyrifera · Mitochondrial DNA Phylogeography · Southeastern Pacific · Subantarctic Full text in pdf format PreviousNextCite this article as: Macaya EC, Zuccarello GC (2010) Genetic structure of the giant kelp Macrocystis pyrifera along the southeastern Pacific. Mar Ecol Prog Ser 420:103-112. https://doi.org/10.3354/meps08893 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 420. Online publication date: December 16, 2010 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2010 Inter-Research.
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