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Allozyme diversity in endemic flowering plant species of the Juan Fernandez Archipelago, Chile: ecological and historical factors with implications for conservation.
High mean G(ST) values for the species examined illustrate the need for conserving as many populations as possible, either in the wild or in the garden, to preserve maximal diversity within species.
Pleistocene refugia and recolonization routes in the southern Andes: insights from Hypochaeris palustris (Asteraceae, Lactuceae)
- A. N. Muellner, K. Tremetsberger, T. Stuessy, C. Baeza
- Environmental ScienceMolecular Ecology
- 8 December 2004
It is very likely that H. palustris recolonized the central ranges of the southern Andes from nearby refugia, possibly unglaciated areas N, E, and/or S of its present distributional area.
Catalogue of the vascular flora of the Robinson Crusoe or Juan Fernandez Islands, Chile
Pleistocene refugia and polytopic replacement of diploids by tetraploids in the Patagonian and Subantarctic plant Hypochaeris incana (Asteraceae, Cichorieae)
The phylogeographic pattern of the Patagonian and Subantarctic plant Hypochaeris incana suggests that the species seems to have expanded its populational system in postglacial times, when the climate became warmer and more humid and there was a parallel replacement of diploids by tetraploids in local populations.
A novel supermatrix approach improves resolution of phylogenetic relationships in a comprehensive sample of danthonioid grasses.
Plant Invasions on an Oceanic Archipelago
- J. Greimler, T. Stuessy, U. Swenson, C. Baeza, O. Matthei
- Environmental ScienceBiological Invasions
- 1 March 2002
Comparisons of earlier and recent surveys of vegetation reveal that the area impacted by Aristotelia,Rubus, and Ugni molinae has increased tremendously, and among the most frequent aliens are Euro-Mediterranean taxa, also present on other archipelagos.
Phylogenetic relationships among species of Hypochaeris (Asteraceae, Cichorieae) based on ITS, plastid trnL intron, trnL-F spacer, and matK sequences.
- R. Samuel, T. Stuessy, K. Tremetsberger, C. Baeza, S. Siljak-Yakovlev
- BiologyAmerican journal of botany
- 1 March 2003
Monophyly of species of Hypochaeris from South America is strongly supported by both ITS and the joint matrix of ITS, trnL, and matK data, and low levels of sequence divergence among South American taxa suggest a pattern of rapid speciation, in contrast to much greater divergence among European representatives.
Genetics of colonization in Hypochaeris tenuifolia (Asteraceae, Lactuceae) on Volcán Lonquimay, Chile
- K. Tremetsberger, T. Stuessy, R. Samuel, C. Baeza, M. Fay
- Environmental Science, BiologyMolecular ecology
- 1 October 2003
Overall genetic variation is analyzed using amplified fragment length polymorphism markers in colonizing populations of Hypochaeris tenuifolia (Asteraceae) in the southern Andes to find genetic diversity within founder populations is lower than in survivor populations nor in isolated populations throughout the range of the species.
Comparative karyotype analysis in Haplopappus Cass. and Grindelia Willd. (Asteraceae) by double FISH with rRNA specific genes
The assumption that the evolution of New World members of Grindelia and Haplopappus has not been accompanied by large karyotypic changes, but small chromosomal rearrangements have undoubtedly occurred is supported.
Karyotype evolution in South American species of Hypochaeris (Asteraceae, Lactuceae)
- H. Weiss-Schneeweiss, T. Stuessy, S. Siljak-Yakovlev, C. Baeza, J. Parker
- BiologyPlant Systematics and Evolution
- 4 November 2003
Karyotypic data are synthesized for South American species of Hypochaeris with new information for six Chilean species: H. acaulis, H. apargioides, Lactuceae, palustris, spathulata, and H.tenuifolia.