Long-term monitoring of Himantoglossum adriaticum H. Baumann population in Keszthely Hills, Hungary

Bódis, Judit and Molnár, Edit (2009) Long-term monitoring of Himantoglossum adriaticum H. Baumann population in Keszthely Hills, Hungary. NATURA SOMOGYIENSIS (15). pp. 27-40. ISSN 1587-1908 (print); 2062-9990 (online)

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Abstract

Long-term monitoring of populations contributes to the better understanding of population dynamics of species. A population of the orchid Himantoglossum adriaticum H. Baumann was monitored in Keszthely Hills in western Hungary during the period 1992-2008. To assess reproductive output in each year, the number of flowering individuals, as well as the number of flowers and fruits produced per plant were recorded. The reproductive traits studied (except the number of flowering plants and seedpods) did not varied considerably, they showed low temporal variability over years, while the other two characteristics mentioned had high temporal variability. Mean number of flowers produced per plant over all years was 31. Fruitproduction was often low or zero. Significant correlations between the rate of fecundity and any of the flowering traits could not be found. Years with high fruit-production do not coincide with years of great number of inflorescences. Thus, the number of inflorescences measured in any one year can not be used as a substitute for reproductive performance measurements. Years with high fruit-set may be able to insure long-term survival of the population.

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