Implemented niche of Daphne taurica Kotov in the Crimea

Abstract

The fundamental niche of Daphne taurica Kotov is considered in the conditions of a realized niche of phytocenosis on the western slope of the Mokrousovsky heights (the right bank of the Bolshaya Burulcha River). The analysis is based on the classical geobotanical description by V.N. Golubev. Calculations of the parameters of the ecological niche of the species were made according to the original program "Pover". Unified information on the placement of plant species of the described phytocenosis on gradients of environmental factors is extracted from the Ecodata database.The implemented fragment of the gradient and the optimum point on it were determined for the leading factors-conditions and resource factors: illumination-shading, thermal mode, aridity-humidity (ombre mode), cryoregime, continentality, humidification, moisture variability, substrate acidity, salt regime (anionic composition), carbonate content, nitrogen content, humus content, granulometric (mechanical) composition of the substrate. The position of phytocenosis species on the gradients of factors-conditions and factors-resources, that is, their range values from the point of minimum to the point of maximum (fundamental values), as well as the comfort range ("comfort corridor") corresponding to the implemented part of the gradient, in general, for phytocenosis is given in the form of graphic drawings, and the ecological niche, in in the form of a petal diagram.Daphne taurica sublimated stenotope, placed in the comfort zone on the following gradients: "lighting-shading", "moisture variability", "substrate reaction", "anionic composition", "carbonate content" and "nitrogen content". Shifted to the lower part of the gradient: "thermal mode", "cryoregime", "humidification"; located outside the comfort corridor in the pessimum zone: "ombre mode" and "substrate porosity". The last two can rightfully be considered limiting factors. The species requires effective protection.