Age and ontogenetic structure of plant population – necessity to distinguish between them
Ivan Franko National University of Lviv
4, Hrushevskyi St., Lviv, 79005, Ukraine
The contents and the difference between the concepts of “age structure” and “ontogenetic population structure” are clarified, as well as a number of derivative terms, which have been discrepantly treated lately. Age and ontogenetic population structures are basic interconnected and complementary population characteristics. However, they are neither interchangeable, nor identical. The age population structure is the ratio of individuals of different age states. Determination of the age structure implies the analysis of the characters according to biological age of individuals. Ontogenetic structure of population should be considered as an integral group characteristic that includes information about the integrity of the development of its individuals. Ontogenetic structure is determined primarily on the basis of multi-year studies that imply defining the characteristics and duration of biological age of individuals in total and separate ontogenetic stages in particular. Narrowing of the concept of ontogenetic structure to age structure does not promote further development of population-ontogenetic research method. It is crucial to pay more attention to ontogenetic analysis in plant population studies in general.
Keywords: age and ontogenetic structure, plant populations