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The knowledge of phenotypic response of rare and protected species provide useful information for the conservation and management strategies. Doronicum austriacum, a subalpine Central-European species has several lowland localities, which in Poland are regarded as glacial relicts. Diverse edaphic, climatic and coenotic conditions in particular localities give evidence to the broad ecological amplitude of the species. Based on data pertaining to three various populations occurring in different geographical regions (from South and Central Poland), different elevations a.s.l. (275–1350 m a.s.l.) and growing within different plant communities (subalpine tall-herb communities, mountain meadow, carr) an attempt has been made to characterise selected morphological, developmental and ecological features (like number of capitula and their diameter, effectiveness of reproduction, spatial distribution) and to test a hypothesis as to whether a lowland form of this species exists. The results indicate certain statistically significant differences (as number and diameter of capitula) between the study populations pertinent to plants at the generative stage. The distribution of the examined traits, however, falls within the range of species variability. The differences between averages are conditioned by the quality of the environment in terms of the soil moisture level, availability of mineral compounds and lighting, as well as by the degree of competition from other plants. The result of the experiment, involving transplantation of specimens into gardens, allow for the presumption that morphological features undergo environment-related modifications. At this stage of the studies, the idea of a morphologically different lowland form of the species cannot be supported.
Drought and herbivory are important stress factors for plants. When plants are subjected to any form of stress, phenotypic responses are elicited to reduce damage. Responses to drought include a decrease in leaf area and aerial biomass, and an increase in root/shoot ratio of biomass allocation. If plants are subjected to drought and herbivory at the same time, constrained responses are expected due to resource limitation. In a greenhouse experiment we analyzed the effect of simulated herbivory on the ability to respond to drought stress in seedlings of the Chilean perennial herb Convolvulus demissus (Convolvulaceae), which in natural populations may experience water deficit during dry summers as well as grazing by mammals. Plants subjected to drought showed the phenotypic responses theoretically expected. In contrast, plants subjected to a combined drought + herbivory treatment did not show those responses, being phenotypically similar to control plants. It is suggested that herbivory may limit responses to drought in C. demissus, hence magnifying the negative consequences on plant fitness of such abiotic factor.
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