Adventive Fraction Research Articles

Аналіз адвентивної фракції урбанофлор Північного Приазов’я (Україна)

Аналіз адвентивної фракції урбанофлор Північного Приазов’я (Україна)

Alien plants of Yalta Mountain-Forest Nature Reserve: State of knowledge and prospects of investigations

The verified list based on published reports and our own data and brief information on 78 alien plant species of the Yalta Mountain-Forest Nature Reserve are given. The recently revealed plant species are represented. The transformation rate of the vegetation in the protected area is evaluated on the basis of the analysis of the structure and dynamics of the adventive fraction. The species grouped accoding to the period of plant introduction, naturalization rate, and original range.

ANTHROPOGENIC TRANSFORMATION OF FLORA OF SUBURBAN FOREST. BOROVETSKIY FOREST OF CHELNY FORESTRY OF TATARSTAN IS TAKEN AS AN EXAMPLE

Borovetskiy Forest, the area of which is 9539 hectares of land, is located in Chelny forestry on the left low-lying bank of Nizhnekamsk water reservoir (Tatarstan, Russia). The tract of firs in Borovetskiy forest of 3,0 hectares of land is the last south-eastern outpost of taiga. There are 530 kinds of vascular plants identified on the studying area, 44 of which are related to adventive fraction of flora. The distribution of adventive flora of life forms (according to traditional classification and K. Raunkiera′s and I.G. Serebryakov′s classification), ecolo-gical-coenotic groups, methods of drifts the degree of naturalization, area type, the time of drift is examined in the article. One of the adventive kind of plant is marked and listed in the Red Book of Tatarstan in 2006 – Lichnis chalcedonica L. The acquired results are suitable for monitoring researches of phytocenoses of Borovetskiy forest.

Синантропний компонент флори Крайових і Зовнішніх Ґорґан

A scarce information is avaliable on vascular plants of Marginal and External Gorgany flora. A focused study of its synanthropic component was not implemented. Analysis of the herbaria collections, published data and own field research findings found that synanthropic fraction of flora consists of 268 species (28 % of the species composition of the flora), 144 (54 %) of which are apophytes, 124 (46 %) – adventive species (inclu­ding archeophytes – 66 (52.8 %) species and kenophytes comprises group of 58 (47.2 %). 75 (52.1 %) species of apophytes group participates only in the ruderal communities, 54 (37.5 %) species – both in the segetal and ruderal ones, only in segetal – 15 (10.4 %) species. A low percentage of segetal species is explained by a small fraction of the plowed areas and the fact that agricultural land is not plowed up annually and periodically are left fallow. Most by species of adventive fraction of Marginal and External Gorgany flora have a tendency to occupy man-made habitats (A) – 83.3 %, semi-natural (S) – 23.0 %, 16 % of listed species into natural communities (N) penetrate. On the altitudinal gradient, synanthropic species are distributed evenly. It is associated with a small difference altitudinal range of the study area and considerable forest cover. Most synanthropic species prefer the meadow cenoses because they are more anthropogenically modified than the forests.

Adventive fraction of herbaceous vegetation of Dendrological Park Olexandria of the NAS of Ukraine

Adventive fraction of herbaceous vegetation of Dendrological Park Olexandria of the NAS of Ukraine

Invasive potential of adventive plant species of the Middle Urals

The adventive fraction of the Middle Ural flora is represented by 328 species of vascular plants from 198 genera and 51 families. Most of the adventive plants are nonaggressive and form the group of epecophytes (41%); all these plants have been accidentally introduced into the Middle Ural flora (xenophytes). Ephemerophytes occupy second place in the number of species (27%). More than half of this group (60%) is represented by ergasiophytes. The maximum diversity of ephemerophytes is observed in the urban flora (26%) and along railways (23%). Colonophytes form a group of similar size (26%), and most of these species are introduced plants. Agriophytes (18 species, or 6%) represent the most aggressive group. Among them, 78% belong to xenophytes and 22% are ergasiophytes. Thirteen agriophyte species represent alien plants: Heracleum sosnowskyi, Artemisia absinthium, Conyza canadensis, Impatiens grandulifera, Bunias orientalis, Chenopodium album, Convolvulus arvensis, Echinocystis lobata, Hippophae rhamnoides, Elodea canadensis, Epilobium adenocaulon, Epilobium pseudorubescens, and Amelanchier spicata. Thus, alien plants are a minor component of the adventive flora of the Middle Urals (4%).

Invasion active introductives as a source of possible addition to adventive fraction of flora

Invasion active introductives as a source of possible addition to adventive fraction of flora

Urban flora as a component of the urban ecosystems in the taiga zone: An example of Karelian cities

Cities are areas of increased diversity of species in the taiga zone. The aboriginal fraction of Karelian flora is a stable natural system whose main characteristics are preserved in the urban flora. The adventive fraction, which is a dynamic component of the flora, has not been completely formed in the cities, as well as in eastern Fennoscandia as a whole. It has become substantially richer during the past 20–25 years. Cities of the taiga zone may serve as objects for monitoring the anthropogenic processes of flora transformation in the North.