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10 results for “Senecio carniolicus”
Data from: Ecological differentiation, lack of hybrids involving diploids, and asymmetric gene flow between polyploids in narrow contact zones of Senecio carniolicus (syn. Jacobaea carniolica, Asteraceae)
Areas of immediate contact of different cytotypes offer a unique opportunity to study evolutionary dynamics within heteroploid species and to assess isolation mechanisms governing coexistence of cytotypes of different ploidy. The degree of reproductive isolation of cytotypes, i.e., the frequency of heteroploid crosses and subsequent formation of viable and (partly) fertile hybrids, plays a crucial role for the long-term integrity of lineages in contact zones. Here, we assessed fine-scale distribution, spatial clustering and ecological niches as well as patterns of gene-flow in parental and hybrid cytotypes in zones of immediate contact of di-, tetra- and hexaploid Senecio carniolicus (Asteraceae) in the Eastern Alps. Cytotypes were spatially separated also at the investigated micro-scale; the strongest spatial separation was observed for the fully interfertile tetra- and hexaploids. The three main cytotypes showed highly significant niche differences, which were, however, weaker than across their entire distribution ranges in the Eastern Alps. Individuals with intermediate ploidy levels were found neither in the diploid/tetraploid nor in the diploid/hexaploid contact zones indicating strong reproductive barriers. In contrast, pentaploid individuals were frequent in the tetraploid/hexaploid contact zone, albeit limited to a narrow strip in the immediate contact zone of their parental cytotypes. AFLP fingerprinting data revealed introgressive gene flow mediated by pentaploid hybrids from tetra- to hexaploid individuals, but not vice versa. The ecological niche of pentaploids differed significantly from that of tetraploids but not from hexaploids.
FIGURE 2 in Underestimated diversity in one of the world's best studied mountain ranges: The polyploid complex of Senecio carniolicus (Asteraceae) contains four species in the European Alps
FIGURE 2. Representative shapes of rosette leaves (left) and cauline leaves (right) of Senecio carniolicus (A) and S. noricus (B). Drawings: R. Flatscher.
FIGURE 3 in Underestimated diversity in one of the world's best studied mountain ranges: The polyploid complex of Senecio carniolicus (Asteraceae) contains four species in the European Alps
FIGURE 3. Representative shapes of rosette leaves (left) and cauline leaves (right) of Senecio insubricus (A) and S. disjunctus (B). Drawings: R. Flatscher.
FIGURE 1 in Underestimated diversity in one of the world's best studied mountain ranges: The polyploid complex of Senecio carniolicus (Asteraceae) contains four species in the European Alps
FIGURE 1. Iconography of Senecio carniolicus (A), S. insubricus (B), S. noricus (C) and S. disjunctus (D). Drawings: R. Flatscher.
FIGURE 4 in Underestimated diversity in one of the world's best studied mountain ranges: The polyploid complex of Senecio carniolicus (Asteraceae) contains four species in the European Alps
FIGURE 4. Representative individuals of Senecio carniolicus (A, Almerhorn, population 58 from Sonnleitner et al. 2010), S. insubricus (B; Plose, population 46), S. noricus (C; Bretthöhe, population 80), and S. disjunctus (D; Bretthöhe, population 80). Note the characteristic differences in indumentum density and leaf dissection as well as in the number of capitula per synflorescence. Photographs: M. Sonnleitner.
FIGURE 5 in Underestimated diversity in one of the world's best studied mountain ranges: The polyploid complex of Senecio carniolicus (Asteraceae) contains four species in the European Alps
FIGURE 5. Distribution of the four species of the Senecio carniolicus agg. in the Eastern Alps based on Sonnleitner et al. (2010); S. carniolicus (A), S. insubricus (B), S. noricus (C) and S. disjunctus (D). Morphometrically evaluated populations are marked with a black dot.
Data from: Extensive range persistence in peripheral and interior refugia characterizes Pleistocene range dynamics in a widespread Alpine plant species (Senecio carniolicus, Asteraceae)
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Data from: Ecological differentiation, lack of hybrids involving diploids, and asymmetric gene flow between polyploids in narrow contact zones of Senecio carniolicus (syn. Jacobaea carniolica, Asteraceae)
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Data from: A novel method to infer the origin of polyploids from AFLP data reveals that the Alpine polyploid complex of Senecio carniolicus (Asteraceae) evolved mainly via autopolyploidy
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Data from: Reciprocal transplantations reveal strong niche differentiation among ploidy-differentiated species of the Senecio carniolicus aggregate (Asteraceae) in the easternmost Alps
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