TY - JOUR

T1 - Strong genetic differentiation on a fragmentation gradient among populations of the heterocarpic annual Catananche lutea L. (Asteraceae)

AU - Gemeinholzer, B.

AU - May, Felix

AU - Ristow, M.

AU - Batsch, C.

AU - Lauterbach, D.

PY - 2012/10/1

Y1 - 2012/10/1

N2 - In landscapes which are predominately characterised by agriculture, natural ecosystems are often reduced to a mosaic of scattered patches of natural vegetation. Species with formerly connected distribution ranges now have restricted gene flow among populations. This has isolating effects upon population structure, because species are often confined by their limited dispersal capabilities. In this study, we test the effects of habitat fragmentation, precipitation, and isolation of populations on the genetic structure (AFLP) and fitness of the Asteraceae Catananche lutea. Our study area is an agro-dominated ecosystem in the desert-Mediterranean transition zone of the Southern Judea Lowlands in Israel. Our analysis revealed an intermediate level of intra-population genetic diversity across the study site with reduced genetic diversity on smaller scale. Although the size of the whole study area was relatively small (20 × 45 km), we found isolation by distance to be effective. We detected a high level of genetic differentiation among populations but genetic structure did not reflect spatial patterns. Population genetic diversity was correlated neither with position along the precipitation gradient nor with different seed types or other plant fitness variables in C. lutea. © 2012 Springer-Verlag.

AB - In landscapes which are predominately characterised by agriculture, natural ecosystems are often reduced to a mosaic of scattered patches of natural vegetation. Species with formerly connected distribution ranges now have restricted gene flow among populations. This has isolating effects upon population structure, because species are often confined by their limited dispersal capabilities. In this study, we test the effects of habitat fragmentation, precipitation, and isolation of populations on the genetic structure (AFLP) and fitness of the Asteraceae Catananche lutea. Our study area is an agro-dominated ecosystem in the desert-Mediterranean transition zone of the Southern Judea Lowlands in Israel. Our analysis revealed an intermediate level of intra-population genetic diversity across the study site with reduced genetic diversity on smaller scale. Although the size of the whole study area was relatively small (20 × 45 km), we found isolation by distance to be effective. We detected a high level of genetic differentiation among populations but genetic structure did not reflect spatial patterns. Population genetic diversity was correlated neither with position along the precipitation gradient nor with different seed types or other plant fitness variables in C. lutea. © 2012 Springer-Verlag.

KW - Ecosystems Research

KW - AFLP

KW - Asteraceae

KW - Heterocarpy

KW - Population structure

KW - Precipitation gradient

UR - http://www.scopus.com/inward/record.url?scp=84866451165&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/10b9ba62-2980-39dc-84a7-1948771cc057/

U2 - 10.1007/s00606-012-0661-1

DO - 10.1007/s00606-012-0661-1

M3 - Journal articles

VL - 298

SP - 1585

EP - 1596

JO - Plant Systematics and Evolution

JF - Plant Systematics and Evolution

SN - 0378-2697

IS - 8

ER -