caa a22 4500 445857129 CHVBK 20180317145431.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10592-010-0130-8 doi (NATIONALLICENCE)springer-10.1007/s10592-010-0130-8 Mating system and pollen flow between remnant populations of the endangered tropical tree, Guaiacum sanctum (Zygophyllaceae) [Elektronische Daten] [Eric Fuchs, J. Hamrick] Tropical trees are generally long-lived making it difficult to assess the long-term effects of habitat fragmentation on genetic diversity. Maintenance of genetic diversity in fragmented landscapes is largely dependent on the species' mating system and the degree of genetic connectivity (seed and pollen flow) among fragments. Currently, these parameters are largely unknown for many endangered tropical tree species. Additionally, landscape fragmentation may isolate tropical tree populations from larger, more continuous populations. The role of isolated individuals in pollen transfer within and between remnant populations is not clear. In this study, we estimate the mating system and pollen flow patterns in continuous and remnant populations of the endangered tropical tree Guaiacum sanctum (Zygophyllaceae). Fractional paternity analyses were used to estimate average gene flow distances between fragmented remnant populations and the siring success of an intermediately located, but isolated individual. In these populations, G. sanctum is a mixed-mating species (t m=0.72−0.95) whose pollen is transported over large distances (>4km). An isolated tree may have functioned as a stepping-stone between two clusters of individuals, assisting long-distance pollen movement. This individual also sired a disproportionately high number of seeds (13.9%), and is thus an important component of the reproductive success of these populations, thus rejecting Janzen's "living-dead” hypothesis. The high levels of genetic diversity maintained as a consequence of long-distance pollen-flow suggest that this endangered species may have the potential for future adaptation and population expansion if suitable habitats become available. Springer Science+Business Media B.V., 2010 Mating system nationallicence Pollen flow nationallicence Fractional paternity nationallicence Isolated trees nationallicence Allozymes nationallicence Guaiacum sanctum nationallicence Costa Rica nationallicence Fuchs Eric Department of Plant Biology, University of Georgia, 30602, Athens, GA, USA aut Hamrick J. Department of Plant Biology, University of Georgia, 30602, Athens, GA, USA aut Conservation Genetics Springer Netherlands 12/1(2011-02-01), 175-185 1566-0621 12:1<175 2011 12 10592 https://doi.org/10.1007/s10592-010-0130-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10592-010-0130-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fuchs Eric Department of Plant Biology, University of Georgia, 30602, Athens, GA, USA aut NATIONALLICENCE 700 1- Hamrick J. Department of Plant Biology, University of Georgia, 30602, Athens, GA, USA aut NATIONALLICENCE 773 0- Conservation Genetics Springer Netherlands 12/1(2011-02-01), 175-185 1566-0621 12:1<175 2011 12 10592 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer