02387nas a2200181   4500008004100000245011600041210006900157300001200226490000800238520171900246653008501965100001902050700002402069700002402093700002202117700001902139856004702158       2003                        eng d00aBiogeography of discontinuously distributed hydrophytes: a molecular appraisal of intercontinental disjunctions0 aBiogeography of discontinuously distributed hydrophytes a molecu  a917-9320 v1643 a<p>The extraordinarily wide distributional ranges of aquatic flowering plants have long stimulated phytogeographical discussion. Although aquatic plants occur rarely among the angiosperms, they represent a disproportionately large number of taxa with broad distributions including various intercontinental disjunctions that are manifest even at the species level. Throughout the nineteenth and early twentieth centuries, long-range dispersal by waterfowl was the prevailing explanation for widespread aquatic plant distributions. This explanation gradually fell into disfavor as biologists raised doubts as to the ability of waterfowl to transport propagules across the extensive transoceanic distances between the continents on which an assortment of aquatic taxa now reside. During the twentieth century, the development of biogeographical displacement theory, i.e., &ldquo;continental drift,&rdquo; steadily began to supplant dispersal as the preferred explanation for discontinuous angiosperm distributions. Our study assesses the dispersal/displacement hypotheses from a temporal standpoint using molecular estimates of divergence time for a diverse sample of phylogenetically related aquatic taxa that exhibit discontinuous intercontinental distributions. With few exceptions, we found divergence times that are far too recent to implicate continental drift as a major determinant of discontinuous distributions in aquatic plants. We suggest that long-distance dispersal by birds should continue to be regarded as a viable explanation for widely disjunct aquatic plant distributions, although such dispersal is likely to have involved a combination of overland as well as transoceanic migratory routes.</p>
10abiogeography, hydrophyte, aquatic plant, intercontinental disjunction, dispersal1 aLes, Donald, H1 aCrawford, Daniel, J1 aKimball, Rebecca, T1 aMoody, Michael, L1 aLandolt, Elias  uhttp://www.jstor.org/stable/10.1086/37865002199nas a2200145   4500008004100000245008600041210006900127300001200196490000700208520172300215100001901938700002201957700002401979856005002003       2005                        eng d00aPhylogeny and Systematics of Aponogeton (Aponogetonaceae): The Australian Species0 aPhylogeny and Systematics of Aponogeton Aponogetonaceae The Aust  a503-5190 v303 aAponogeton is an important genus whose species are cultivated as ornamental aquatic plants. Although a fairly recent monograph has been published, the genus remains poorly studied systematically. We conducted a phylogenetic survey of Aponogeton that focuses on relationships among the nine native Australian species as well as their relationship to other members of the genus. Our analyses included a phylogenetic assessment of morphological characters and molecular data obtained both from chloroplast (trnK 5' intron, matK) and nuclear DNA (nrITS) loci. Molecular data provided evidence of hybridization and polyploidy as well as an informative overview of interspecific relationships in the genus. Two potentially new Australian species alwo were identified by the molecular data. Combined molecular data produced a well-resolved cladogram that enabled us to evaluate previous phylogenetic hypotheses based on non-explicit methods as well as teh soundness of the existing classification of the genus. We conclude that Aponogetonaceae originated in Australia and subsequently radiated into Africa, Madagascar, and Asia, from which a secondary Australian diversification occurred resulting in a biphyletic origin of the native Australian species. A pattern of morphological distinctiveness coupled with low molecular divergence indicates relatively recent and rapid speciation of Aponogeton in Australia. Our results also demonstrate that in this group, morphological data are extremely unreliable taxonomically due to their extensive homoplasy. The phylogenetic relationships elucidated by this study provide evidence to support the establishment of two additional sections, Flavida and Viridis, which are described.1 aLes, Donald, H1 aMoody, Michael, L1 aJacobs, Surrey, W L  uhttps://juncaginaceae.myspecies.info/node/20700611nas a2200169   4500008004100000245007300041210006900114300001200183490000700195653005000202653005200252100001900304700002200323700002400345700002200369856005000391       2002                        eng d00aSystematics of Seagrasses (Zosteraceae) in Australia and New Zealand0 aSystematics of Seagrasses Zosteraceae in Australia and New Zeala  a468-4840 v2710asystematics, taxonomy, ITS, trnK intron, rbcL10aZosteraceae, seagrasses, Australia, New Zealand1 aLes, Donald, H1 aMoody, Michael, L1 aJacobs, Surrey, W L1 aBayer, Randall, J  uhttps://juncaginaceae.myspecies.info/node/208