caa a22 4500 445856866 CHVBK 20180317145430.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10592-009-9992-z doi (NATIONALLICENCE)springer-10.1007/s10592-009-9992-z Gene flow in an endangered willow Salix hukaoana (Salicaceae) in natural and fragmented riparian landscapes [Elektronische Daten] [Satoshi Kikuchi, Wajiro Suzuki, Naoko Sashimura] Salix hukaoana is an endangered riparian pioneer tree that is distributed within a restricted area of Japan. Microsatellite genetic variations and genetic structures were investigated in 80 subpopulations patchily distributed within five river basins with varying degrees of habitat fragmentation. The correlation between geographic distance and genetic distance based on the Bayesian assignment test was significant across relatively intact riparian habitats, with steeper slopes of regression for more densely grouped subpopulations, suggesting restricted gene flow. However, the correlation became less apparent with increasing spacing of the habitat patches. These contradictory results are attributed to the increased chance of long-distance dispersal of sexual propagules among more isolated habitat patches. The observed accumulation of genetic diversity with increasing distance downstream along a few, but not all, of the rivers and the results of assignment tests suggested a downstream directionality of gene flow. The results of this study illustrate the patterns of genetic diversity and contemporary dispersal of S. hukaoana, and provide important insights into understanding the gene dispersal of riparian trees and into the conservation of genetic resources for this species. Springer Science+Business Media B.V., 2009 Salix hukaoana nationallicence Endangered species nationallicence Riparian willow nationallicence Microsatellites nationallicence Gene flow nationallicence Kikuchi Satoshi Forestry and Forest Products Research Institute, 1 Matsunosato, 305-8687, Tsukuba, Ibaraki, Japan aut Suzuki Wajiro Forestry and Forest Products Research Institute, 1 Matsunosato, 305-8687, Tsukuba, Ibaraki, Japan aut Sashimura Naoko Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, 113-8657, Bunkyo, Tokyo, Japan aut Conservation Genetics Springer Netherlands 12/1(2011-02-01), 79-89 1566-0621 12:1<79 2011 12 10592 https://doi.org/10.1007/s10592-009-9992-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10592-009-9992-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kikuchi Satoshi Forestry and Forest Products Research Institute, 1 Matsunosato, 305-8687, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Suzuki Wajiro Forestry and Forest Products Research Institute, 1 Matsunosato, 305-8687, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Sashimura Naoko Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, 113-8657, Bunkyo, Tokyo, Japan aut NATIONALLICENCE 773 0- Conservation Genetics Springer Netherlands 12/1(2011-02-01), 79-89 1566-0621 12:1<79 2011 12 10592 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer