SEX RATIOS IN THE POPULATION OF DIOECIOUS SPECIES TRINIA MULTICAULIS (POIR.) SCHISCHK. (UMBELLIFERAE)

S. E. Petrova

Abstract


Sex ratios in the population of the dioecious species Trinia multicaulis (Umbelliferae, Apiaceae) have been studied. In three coenopopulations sex ratios were significantly different, f/m was 0,6; 1,2 и 1,5. In total 409 generative individuals have been found: 198 male and 211 female. Sex ratio is close to 1:1. At the studied sites besides Trinia about 40 species are growing. Density of individuals at the sites with different floristic composition and topography varies significantly. The highest density of T. multicaulis individuals are observed at the decreasing part of the slope with the low number of other species. Cross-pollination is relatively effective, the number of mature fruits is 480–1603 units per plant; seed production is 960–3206 seeds per plant respectively. Significant correlation between males and females in the location is not found. Some trends to compact arrangement of one gender at distances 5–8 meters apart can  be revealed. The geometric figure of the distribution of T. multicaulis individuals is probably a reflection of the floristic composition in the community and partly of the special type of seed dispersal (by tumbleweed type). The analysis indicates the complexity of the interpretation of the statistical data on the distribution of gender types in populations of dioecious  plants.


Keywords


Trinia multicaulis, dioecy, coenopopulation, spatial arrangement, seed production

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