Bog, Manuela and Ehrnsberger, Hans Friedrich and Elmer, Michael and Baessler, Claus and Oberprieler, Christoph (2017) Do differences in herbivore resistance contribute to elevational niches of species and hybrids in the central European Senecio nemorensis (Compositae, Senecioneae) syngameon? PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS, 24. pp. 61-71. ISSN 1433-8319,
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Elevational gradients with adjacent distribution zones of closely related and hybridising plant species provide a suitable natural set-up for studying evolutionary processes like adaptation and speciation. Transplantation experiments along these gradients are a straightforward strategy to infer fitness differences among genotypes and to pinpoint intrinsic and extrinsic factors that govern elevational stratification. Senecio germanicus, S. ovatus, and S. hercynicus belong to the S. nemorensis syngameon and show differential elevational distribution with mutual hybridisation in their range overlaps. We here report on the results of transplantation experiments with the three species and their reciprocal F-1 hybrids along an elevational transect in the Bavarian Forest, SE Germany, in which we measured leaf area loss through mollusc herbivores and through withering caused by climatic influences. We find a strong correlation of the amount of the remaining photosynthetically active leaf area and rhizome dry weight as a proxy for overall viability of plants and. their reproductive and propagational success. In the S. hercynicus-S. ovatus system, higher damage values caused by herbivores in the former species and by withering in the latter one, along with intermediate values found for hybrid genotypes, suggests a trajectory following an advancing wave model of introgressive hybridisation. In the S. germanicus-S. ovatus system, the more effective herbivore deterrent strategy of S. ovatus; together with its higher susceptibility to colder conditions should follow a mosaic hybrid zone model and eventually to a patchy distribution of pure parental. and hybrid populations governed by the heterogeneity of climatic conditions at lower elevations. (C) 2016 Elsevier GmbH. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | S. OVATUS COMPOSITAE; PYRROLIZIDINE ALKALOIDS; CLIMATE-CHANGE; GENERALIST HERBIVORES; MONTANE ASTERACEAE; SLUG HERBIVORY; NATIONAL-PARK; GENE FLOW; PLANTS; HYBRIDIZATION; Differential elevational distribution; Herbivory; Hybridisation; Introgression; Molluscs |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 13 Feb 2019 14:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/416 |
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