Morphological and genetic variation in Egregia menziesii over a latitudinal gradient
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Sarah K. Henkel
Abstract
This study characterized morphological variation in the kelp, Egregia menziesii, over a large geographic scale. Marked differences in rachis and lateral blade morphology were observed, suggesting local adaptation to the variable conditions of wave exposure and upwelling found across the study area. Observations of rachis type at different developmental stages indicated differential survivorship of smooth versus papillated individuals at sites with differing wave exposure. Variations in Egregia morphology have long been recognized and were previously used for discriminating species within the genus; thus, we tested the hypothesis that the different morphological forms reflect genetically distinct populations. Nucleotide sequences of the ITS regions did not reveal genetic structure among three, morphologically distinct populations providing little evidence for speciation in Egregia.
©2007 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Native eelgrass (Zostera marina L.) survival and growth adjacent to non-native oysters (Crassostrea gigas Thunberg) in the Strait of Georgia, British Columbia
- Heavy metal biomonitoring by seaweeds on the Delmarva Peninsula, east coast of the USA
- Morphological and genetic variation in Egregia menziesii over a latitudinal gradient
- An improved method for staining chromosomes of marine algae
- Characterization of Gracilaria lemaneiformis Bory (Gracilariaceae, Rhodophyta) cultivars in China using the total soluble proteins and RAPD analysis
- Antiviral activity of a sulfoquinovosyldiacylglycerol (SQDG) compound isolated from the green alga Caulerpa racemosa
- Seasonal variations in the composition and gel quality of agar from Gracilaria edulis in the Philippines
- Meetings
