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Видообразование и филогеография растений Азиатской России в связи с четвертичными изменениями климата на примере модельных родов злаков.

Goal: Попытка увязать морфологическое (фенетическое) разнообразие с его географической (климатической ) приуроченностью и исследовать наиболее вероятную динамику ареалов от плиоцена до нашего времени на примере модельных групп (Poa sect. Stenopoa, Stipa, Brachypodium, Leymus).

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Project log

Marina V. Olonova
added a research item
Poa scabriculmis N.R. Cui, 1987, is known as endemic species of alpines of Kunlun Mountains (Xinjiang Province, NW China). Later, in Flora of China, it was treated as subspecies of polytypical species P. albertii Regel, and sinonimized with other four relative species. In this work we restore the status of this species and present its new occurrence in Sichuan province (China). This paper present taxonomic notes, morphological description, habitat, and the current geographic distribution for P. scabriculmis
Polina Gudkova
added 2 research items
Each species besides of having the unique morphological pattern also has an unique ecologo-climatic niche and geographical range. The study of ecologico-climatic and geographic divergence can make significant contribution to understanding of the species genesis and its volume. The purpose of this paper was to compare the ecologo-climatic niches of the closely related species Stipa sareptana and S. krylovii in order to reveal their identity. The research allowed specifying the areas of both species. Using GIS methods and based on the points of presence and six independent bioclimatic characters, their potential ranges – areas where the climatic conditions are favorable for growth – were identified and ecologo-climatic niches revealed. It was established that the most important factors determining the distribution of S. krylovii and S. sareptana are the mean annual temperature and seasonality of precipitation. Other factors play a subordinate role. The comparison of ecological niches, generated by MaxEnt, showed their differences at a statistically significant level.
The genus Stipa in the Altai territory is represented by 12 species (Lomonosova, 2003, Silanteva, 2013, Gudkova et al., 2015). Stipacapillata L., which belongs to the Leiostipa Dumor. section, is one of the most widespread species of this genus. Besides S. capillata, two more species of this section – S. praecapillata Alech. and S. Baicalensis Roshev. occur on the territory of the region. However, they both have a very limited distribution: the first is represented by single finds in Klyuchevsky, Kuryinsky, Pospelikhinsky and Rubtsovsky districts of Altay, and the latter one occurs only in Charyshsky district. Thus, in the territory of the region there is a unique opportunity to study the population variability of S. capillata, as in other regions it often grows together with closely related species and hybridizes with them (in the west with S. sareptana A. Beck., and S. praecapillata Alech., and in the south and east - with S. grandis P. Smirn, S. krylovii Roshev and S. baicalensis. The problem of the volume and boundaries of S. capillata L. is caused by its wide distribution from Spain to Yakutia and high polymorphism. Many authors accepted the different limits of variability in the characteristics of S. capillata, which makes it difficult to define this taxon, for instance, in almost all the floristic revisions the authors suggest, that the node of generative shoot is hidden by the leaf sheathes because of the leaf sheath is longer than the internode, and only N.N. Tsvelev (Tzvelev, 1976) and H. Freitag (Freitag, 1985) admit that a node within this species can be exposed. The purpose of our study was to research the population variability of S. capillata on the territory of the Altai in order to specify the limits of its features variation. 242 individuals of S. capillata belonging to 11 populations were involved in the analysis. The paper presents the result of statistical analysis by 26 quantitative and 2 qualitative features. A description of the lemma ultrastructure is also given. On the basis of the analysis, a refined morphological description of the species is given and the limits of variability of characteristics are indicated. It has also been established that some individuals with trichomes up to 0.15 mm on the tip of lemma, as well as individuals with closed nodes can be found within S. capillata species. It rejects themorphological pattern, accepted for S. capillata earlier. Despite the significant broadening of the boundaries of the variability of the signs, morphological differentiation was not revealed. All objects included in the analysis form a single cluster and belongto one general population. Also, the article provides information on the ecologo-cenotic association and distribution of thisspecies based on the revision of herbarium collections stored in AA, BM, E, GAT, K, KAS, KRA, KUZ, LE, M, MW, MHA, TK, NS, NSK,UPS.
Marina V. Olonova
added 2 research items
Poa compressa L. is a widespread grass of Europe and Far East. Now it is considered a noxious alien weed in North America. In recent years, it has begun to appear in Western Siberia, raising questions about its potential to continue to invade and become noxious in this region. The aims of our study were to infer areas where P. compressa may occur or become invasive in Siberia and to identify environmental factors associated with its distribution. We used the maximum entropy (MaxEnt) method of species distribution modeling for predicting suitable habitats for Poa compressa and revealing the role of eight biologically significant climatic factors within its distribution. We evaluated the predictive skill of models using the area under the receiver operating characteristic curve (AUC). Resulting models suggest poor suitability of most of Western Siberia for R compressa. Minimum temperatures appeared to be the most important factor limiting the occurrence of P. compressa in Western Siberia. While P. compressa does not appear poised to expand greatly into Western Siberia under current climatic conditions, it may be able to expand considerably if the current trend of increasing minimum temperatures continues.
Marina V. Olonova
added a project goal
Попытка увязать морфологическое (фенетическое) разнообразие с его географической (климатической ) приуроченностью и исследовать наиболее вероятную динамику ареалов от плиоцена до нашего времени на примере модельных групп (Poa sect. Stenopoa, Stipa, Brachypodium, Leymus).