Bibliographic Detail
Yong, Y.S.D.M. de, 1998
Reference:
Yong, Y.S.D.M. de (1998). Systematic, phylogenetic and biogeographic studies of Atlantic seaweeds. pp. 1-206. Leiden: Leiden University.
Location:
Leiden
Notes:
Effectively published. ISBN 90-71236-37-4. Full name: Yde Sijbrand Diederick Maria de Jong
Abstract:
Studies on Dasyaceae
The Dasyaceae is one of the four families within the order Ceramiales. Phylogenetic relationships among the genera of the Dasyaceae, and the position of the family within the Ceramiales, however, have not been fully resolved yet. This is largely because most of its genera are defined by a varying combination of characters and not by single, diagnostic features. Moreover conflicting views on character polarity within the Dasyaceae have been put forward. Detailed observations on the morphology and reproductive structures (Chapter 2) of the Dasyaceae genus Eupogodon revealed problems which necessitated a re-evaluation of the taxonomy and classification of the Dasyaceae.
An extensive revision of the genus Eupogodon is presented (Chapter 3), resulting in a redefinition of Eupogodon, and the establishment of the new genus Dipterocladia. In both studies (Chapters 2 and 3) an integral overview and comparison of characters of respectively reproductive and vegetative structures of Dasyaceae genera are given as well.
Morphological as well as molecular characters of the Dasyaceae and selected outgroups are used for cladistic analysis (Chapter 4). Several hypotheses on phylogenetic relationships, character evolution, and the monophyly of groups within Dasyaceae and Ceramiales have been tested. New concepts of the classification of the Dasyaceae are formulated.
Studies on Nemacystus, Sebdenia and Acanthophora
The pantropical benthic seaweed genera Nemacystus (Spermatochnaceae, Phaeophyceae), Sebdenia (Halymeniales, Rhodophyceae) and Acanthophora (Rhodomelaceae, Rhodophyceae) are treated phylogenetically and the obtained cladograms are used for historical biogeographic analysis.
A world-wide taxonomic review of the brown seaweed genus Nemacystus is presented (Chapter 5). Based on this review new varieties and taxonomic combinations are proposed, and phylogenetic and biogeographic hypotheses are inferred from morphological data.
Information on vegetative characters provided from a recent contribution to the taxonomy and systematics of the red seaweed genus Sebdenia (Soler-Onís et al., 1998) is used for phylogenetic and biogeographic analyses (Chapter 6).
A full taxonomic revision of the red seaweed genus Acanthophora is presented in Chapter 7. Reproductive and vegetative characters are discussed, and a selection of characters is used for phylogenetic and biogeographic analyses.
Historical biogeography
Based on the cladograms of Nemacystus, Sebdenia and Acanthophora combined with their associated distributions, a historical biogeographical analysis focused on warm temperate-to-tropical marine biogeographic regions is carried out (Chapter 8). Different methods (Brooks Parsimony Analysis, Component Compatibility Analysis and Hovenkamp Analysis) are applied and compared among each other.
A single general area cladogram is obtained using Brooks Parsimony Analysis (BPA) and Component Compatibility Analysis (CCA). Hovenkamp Analysis (HA) shows a common historical sequence of vicariant events. A similar historical biogeographic pattern is apparent in the results of BPA, CCA, and HA, including a primary West Pacific distribution in all genera, with an ancient Tethyan imprint in Nemacystus and Sebdenia, followed by the colonisation of the western Indian Ocean, subsequent (South) Atlantic introductions around South Africa, and a further northward Atlantic expansion into the East Pacific, warm temperate East Atlantic and Mediterranean regions. Re-migration from the Atlantic into the Indo-Pacific is found in several species of Acanthophora and Sebdenia. Major palaeo-oceanographic events and some methodological issues are briefly discussed.
