Strong genetic differentiation on a fragmentation gradient among populations of the heterocarpic annual Catananche lutea L. (Asteraceae)

摘要: In landscapes which are predominately characterised by agriculture, natural ecosystems often reduced to a mosaic of scattered patches vegetation. Species with formerly connected distribution ranges now have restricted gene flow among populations. This has isolating effects upon population structure, because species confined their limited dispersal capabilities. this study, we test the habitat fragmentation, precipitation, and isolation populations on genetic structure (AFLP) fitness Asteraceae Catananche lutea. Our study area is an agro-dominated ecosystem in desert–Mediterranean transition zone Southern Judea Lowlands Israel. analysis revealed intermediate level intra-population diversity across site smaller scale. Although size whole was relatively small (20 × 45 km), found distance be effective. We detected high differentiation but did not reflect spatial patterns. Population correlated neither position along precipitation gradient nor different seed types or other plant variables C.