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/10.1086/37865000382nas a2200145   4500008004100000245001800041210001800059260003000077300001200107490000600119100002100125700001900146700002100165856005000186       1967                        eng d00aJuncaginaceae0 aJuncaginaceae  aBaselbBirkhäuser Verlag  a209-2110 v11 aHeß, Hans Ernst1 aLandolt, Elias1 aHirzel, Rosmarie  uhttps://juncaginaceae.myspecies.info/node/155