title: Variability of non-polar secondary metabolites in the red alga Portieria.
abstract: Possible sources of variation in non-polar secondary metabolites of Portieria hornemannii, sampled from two distinct regions in the Philippines (Batanes and Visayas), resulting from different life-history stages, presence of cryptic species, and/or spatiotemporal factors, were investigated. PCA analyses demonstrated secondary metabolite variation between, as well as within, five cryptic Batanes species. Intraspecific variation was even more pronounced in the three cryptic Visayas species, which included samples from six sites. Neither species groupings, nor spatial or temporal based patterns, were observed in the PCA analysis, however, intraspecific variation in secondary metabolites was detected between life-history stages. Male gametophytes (102 metabolites detected) were strongly discriminated from the two other stages, whilst female gametophyte (202 metabolites detected) and tetrasporophyte (106 metabolites detected) samples were partially discriminated. These results suggest that life-history driven variations, and possibly other microscale factors, may influence the variation within Portieria species.
authors.affiliation: Phycology Research Group, Ghent University, Krijgslaan 281, S8, 9000 Ghent, Belgium.
authors.forename: Dioli Ann
authors.initials: DA
authors.lastname: Payo
authors.affiliation: Phycology Research Group, Ghent University, Krijgslaan 281, S8, 9000 Ghent, Belgium.
authors.forename: Joannamel
authors.initials: J
authors.lastname: Colo
authors.affiliation: Institute of Environmental and Marine Sciences, Silliman University, Dumaguete City 6200, Philippines.
authors.forename: Hilconida
authors.initials: H
authors.lastname: Calumpong
authors.affiliation: Phycology Research Group, Ghent University, Krijgslaan 281, S8, 9000 Ghent, Belgium.
authors.forename: Olivier de
authors.initials: O
authors.lastname: Clerck
mesh_terms: D056771:Ovule / Q000378:metabolism*; D010679:Philippines; D011058:Pollen / Q000378:metabolism*; D025341:Principal Component Analysis; D000461:Rhodophyta / Q000737:chemistry / Q000145:classification / Q000378:metabolism*; D013045:Species Specificity