Phylogenetic, taxonomic and biogeographical studies in the Pithophoraceae (Cladophorales, Chlorophyta)

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Phylogenetic, taxonomic and biogeographical studies in the Pithophoraceae (Cladophorales, Chlorophyta)

Type: Doctoral Thesis
Title: Phylogenetic, taxonomic and biogeographical studies in the Pithophoraceae (Cladophorales, Chlorophyta)
Author: Boedeker, Christian
Publisher: Netherlands Centre for Biodiversity Naturalis (section National Herbarium of the Netherlands), Leiden University Branch
Issue Date: 2010-12-21
Keywords: Aegagropila lineage
Dispersal
Distributions
Green algae
Molecular systematics
Niche evolution
Ribosomal DNA sequences
Ulvophyceae
Abstract: The Aegagropila-clade is a unique lineage of algae within the large order Cladophorales and consists of poorly known taxa that mainly occur in brackish and freshwater environments. The clade is sister to the species-rich, primarily marine Cladophora- and Siphonocladus-lineages. Most of its members occur in narrow niches such as on the carapaces of freshwater turtles (some members of Basicladia), on freshwater snails and bivalves (monotypic Arnoldiella and several Basicladia species), on and endophytically in saltmarsh plants and mangrove pneumatophores (some members of Wittrockiella), or on marine intertidal snails (Cladophora conchopheria). Aegagropila linnaei is the best known representative of the lineage and has gained considerable scientific, cultural and economic fame due to the peculiar lake balls formed under specific conditions. The confused taxonomy of the Aegagropila-clade was clarified using methods of molecular phylogenetic inference, resulting in the re-instatement of the Pithophoraceae, descriptions of two new genera and several nomenclatural changes. Phylogenetic analyses led to an understanding of the evolution of the heterotrichous habit as an adaptation to changeable environmental conditions. In selected taxa, topics such as phylogeography and dispersal abilities, historical biogeography and glacial refugia, and ecology and declining populations were studied in detail.
Description: Promotor: E.F. Smets, Co-promotor: F. Leliaert With Summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Boedeker, C, 2010, Doctoral Thesis, Leiden University
ISBN: 9789090258621
Sponsor: Alberta-Mennega-Stichting, Leids Universitair Fonds, Phycological Society of America, Schure-Beijerinck-Popping Fonds, SYNTHESYS program
Handle: http://hdl.handle.net/1887/16263
 

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