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|Molecular systematics and cryptic diversity of the genus Dictyota (Dictyotales: Phaeophyta) with special reference to species occurring in the Philippines|
Payo, D.A. (2005). Molecular systematics and cryptic diversity of the genus Dictyota (Dictyotales: Phaeophyta) with special reference to species occurring in the Philippines, in: Mees, J. et al. (Ed.) (2005). VLIZ Young Scientists' Day, Brugge, Belgium 25 February 2005: book of abstracts. VLIZ Special Publication, 20: pp. 4
In: Mees, J.; Seys, J. (Ed.) (2005). VLIZ Young Scientists' Day, Brugge, Belgium 25 February 2005: book of abstracts. VLIZ Special Publication, 20. Vlaams Instituut voor de Zee (VLIZ): Oostende. X, 129 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more
Species diversity; Taxonomy; Dictyota dichotoma (Hudson) J.V.Lamouroux, 1809 [WoRMS]; Dictyota J.V.Lamouroux, 1809 [WoRMS]; ISEW, Philippines [gazetteer]; Marine
In order to study the molecular systematics and cryptic diversity of the brown macroalgal genus, Dictyota (Dictyotales: Phaeophyta), 3 objectives were set: 1. to make an inventory of the Dictyota species occurring in the Philippines; 2. to determine congruence between morphological and phylogenetic species concepts; 3. to study cryptic diversity in the Dictyota dichotoma complex. This thesis puts special emphasis on Philippine Dictyota species.
Inventory and morphological examination of specimens collected in the islands of Visayas in the Philippines revealed that at least 7 species of Dictyota can be found in the region. The species identified were the following: Dictyota bartayresiana Lamouroux, D. canaliculata De Clerck & Coppejans, D. cervicornis Kütz., D. ceylanica Kütz, D. ciliolate Sond. ex Kütz, D. crispate J.V. Lamour and D. friabilis Setchell. Dictyota dichotoma which had been frequently reported from several localities throughout the Philippines was not encountered during the present study. De Clerck (2003) seriously doubted the presence of the generitype, D. dichotoma (originally described from England) in tropical latitudes.
The phylogenetic analyses (focusing on Maximum likelihood tree outputs) used the LSU nrRNA gene, the plastid encoded rbcL gene, and interleaved nrRNA- LSU gene sequences of Dictyota species and other Dictyotaceae taxa as outgroups. The total numbers of taxa used for each dataset were 44, 35, and 29 taxa, respectively. Apart from Philippine samples, sequences were obtained from Dictyota and Dictyotales specimens from several different geographic regions. Some sequences deposited in GENBANK were also included in the analyses.
The family Dictyotaceae, the largest in the order Dictyotales, is subdivided into two tribes: Dictyoteae and Zonariae. The Dictyoteae are recognized by the single lens shaped apical cell as opposed to a row or group of apical cells found in the Zonariae. Scoresbyella, the only genus of Scoresbyellaceae and characterized by a wedge shaped vertically oriented apical cell, appears closely related to the Dictyoteae in the analyses.