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    Wyświetlanie 1-5 z 5
    Tytuł:
    The dynamics of the population of a steppe perennial Senecio macrophyllus M.BIEB. during xerothermic grassland overgrowing
    Autorzy:
    Czarnecka, B
    Powiązania:
    https://bibliotekanauki.pl/articles/56894.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    population dynamics
    steppe plant
    Senecio macrophyllus
    xerothermic grassland
    life-stage structure
    Opis:
    The study aimed to determine the long-term changes of the Senecio macrophyllus M.BIEB. population traits: the abundance, reproduction mode, individual fecundity, seed rain and recruitment of new genets in the course of xerothermic grassland overgrowing. The study had also the applied goal: to estimate the chances of "special care" species to survive in the changing environment without management regime for the maintenance of grassland. The model object was the island population of large-leaved ragwort on Biała Góra (the White Mountain) near Tomaszów Lubelski, South-East Poland. To achieve these aims I used the following sets of data: phytosociological relev,s made in plant communities in an interval of 16-18 years; repeated elaboration of the numbers and life-stage structure of the population, both by non-surface and surface method; observation of plants, life cycle in 50 labelled genets; population reproduction and seed rain amounts. The area of an open xerothermic grassland decreased due to the process of overgrowing by bushes which was accompanied by the increasing coverage of forest and meadow herbs as well as monocotyledons, mainly Brachypodium pinnatum and Calamagrostis epigejos. The abundance of the S. macrophyllus population noticable diminished. The flowering mode has been changing during years from an oscillation to a chaotic type which caused the significant decreasing of the individual fecundity, population reproduction and seed rain. In last years it was reflected in the interruption of juveniles’ recruitment.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2009, 78, 3; 247-256
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to morphology and ecology of Polyporus rhizophilus
    Dane do morfologii i ekologii Polyporus rhizophilus
    Autorzy:
    Luszczynski, J.
    Luszczynska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/67667.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    morphology
    ecology
    Polyporus rhizophilus
    fungi
    graminicolous fungi
    threatened fungi
    steppe fungi
    occurrence
    locality
    Opis:
    The distribution and ecological conditions of the occurrence of Polyporus rhizophilus in Poland are discussed. The species was previously known from only one locality in Dwikozy near Sandomierz. Further localities were found on the roots of Stipa capillata in the Skorocice reserve near Busko Zdrój and at an anthropogenic site among Dactylis glomerata, Poa annua and P. trivialis grasses in an urban park in Końskie. The latter locality is noteworthy as it is situated outside the occurrence range of xerothermic grasslands in the Wyżyna Kielecko-Sandomierska upland. This locality is isolated ecologically from the two remaining Polish localities situated in the xerothermic grasslands.
    Polyporus rhizophilus należy do rzadkich grzybów związanych z trawami stepów i kserotermicznych muraw rozwijających się w klimacie kontynentalnym. Na stanowiskach naturalnych notowany bywał głównie na korzeniach wielu gatunków traw, jednak najczęściej z rodzaju Stipa. W Polsce znany był do tej pory z jednego stanowiska w Dwikozach koło Sandomierza. Kolejne jego stanowiska zostały odszukane w rezerwacie Skorocice koło Buska Zdroju, na korzeniach Stipa capillata oraz w Końskich, w parku miejskim, na siedlisku antropogenicznym, wśród traw Dactylis glomerata, Poa annua i P. trivialis. Interesującym jest stanowisko w Końskich, leżące poza północną granicą zasięgu Polyporus rhizophilus, poza obszarem występowania muraw kserotermicznych na Wyżynie Kielecko-Sandomierskiej. Występowanie tego gatunku grzyba na izolowanym stanowisku być może należy wiązać z globalnym zjawiskiem ocieplenia klimatu. Na ten problem zwracał już uwagę Kreisel (2006), który zalicza m.in. Polyporus rhizophilus do grupy grzybów ciepłolubnych rozszerzających swój areał na północ w kontekście aktualnych zmian klimatycznych.
    Źródło:
    Acta Mycologica; 2010, 45, 2
    0001-625X
    2353-074X
    Pojawia się w:
    Acta Mycologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The floristic differentiation of microhabitats within kurgans in the desert steppe zone of Southern Ukraine
    Autorzy:
    Sudnik-Wojcikowska, B
    Moysiyenko, I.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/58569.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    kurgan flora
    plant ecology
    floristic diversity
    Kherson Region
    botany
    Ukraine
    barrow flora
    Pontic desert steppe zone
    microhabitat
    flora
    Opis:
    Results of the studies on the floristic biodiversity of the kurgans in the Pontic desert steppe of the Black Sea Lowland (Kherson Region) are presented. Twenty-six of about 130 kurgans higher than 3 m, distributed over an area of approx. 1500 km2, were surveyed and the flora of 5 microhabitats within every kurgan (top, southern and northern slope, southern and northern foot) was examined. The richness of the kurgan flora is estimated at 305 species. Species of alien origin constituted 23% of the total flora, which indicates limited anthropogenic influence. Species of two classes, Festuco-Brometea and Stellarietea mediae were predominant, which also confirmed the semi-natural character of the kurgan flora. The lowest number of species was recorded on top, which was relatively rich in synanthropes, particularly therophytes (Stellarietea mediae). The north side was richer in species than the south side of the kurgans. Steppe species were the most stable and important component of the flora of the slopes (45-47% of the species represented the class Festuco-Brometea). The total flora of the foot contained more species and was more diversified than the flora of the slopes (although the mean number of species was similar in both habitats), but each species occurred at low frequency. There was a higher proportion of species which were introduced from the area surrounding the kurgans, e.g. weeds, halophytes, meadow species, as well as trees which are rarely found in the desert steppe zone. In spite of the small size of the kurgans, significant differences between the floristic composition of the various microhabitats were detected.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2008, 77, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Floral biology of Senecio macrophyllus M. Bieb. (Asteraceae), a rare Central European steppe plant
    Autorzy:
    Czarnecka, B.
    Denisow, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/57873.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    floral biology
    Senecio macrophyllus
    Compositae
    rare species
    insect visitation
    female phase
    male phase
    pollen production
    pollen viability
    Central Europe
    steppe plant
    Opis:
    Knowledge of the flowering phase and plant pollination ecology is very important for understanding the life history of long-lived perennials. In the case of rare species, the information may have implications for conservation practices. Our studies on flower morphology and blooming biology of the vulnerable plant Senecio macrophyllus M. BIEB. were conducted in situ (flowering, activity of insect visitors) in the largest population in SE Poland and in laboratory (light and scanning electron microscopy). The disc florets open diurnally with most intensive anthesis in the early afternoon and attract insect visitors with nectar and pollen. In highly protandrous disc florets, pollen viability decreases in time, whereas stigma receptivity increases. The upper part of the pistil forms a brush-like pollen presenter, covered with unicellular trichomes with chromoplasts. Pollen presentation lasts 4–11 hours per floret, and 8 days in a single head, the main function of which is to extend the availability of male gamets for reproduction. The number of florets per head, the head size, and the number of pollen grains produced per anther, and the pollen grain viability differed significantly between microsites. The finding indicates that, apart from the biotic factors, abiotic conditions may considerably influence generative reproduction of the species. In the study area, the principal visitors of S. macrophyllus flowers were Hymenoptera, with predominance of Apis mellifera (53.4% of visits). The remarkable share of butterflies (13.9%) recognized as the long-distance moving insects may improve the genetic variability of individuals within a fragmented population. A more detailed study is necessary to explain the role of insect visitors in effective pollination and in gene transfer between patches. The assessment of optimal conditions for the generative reproduction is fundamental for the in situ conservation of this rare species.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2014, 83, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seslerio uliginosae-Scorzoneretum purpureae (Festuco-Brometea class) in the Nida Basin (Malopolska Upland) after 90 years
    Autorzy:
    Towpasz, K.
    Stachurska-Swakon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/56885.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Seslerio uliginosae-Scorzoneretum purpureae community
    Festuco-Brometea class
    Nida basin
    Malopolska Upland
    Sesleria uliginosa
    gypsum grassland
    xerothermic grassland
    species diversity
    succession
    steppe reserve
    ecological indicator
    Opis:
    Seslerio uliginosae-Scorzoneretum purpureae is the only xerothermic community of the Festuco-Brometea class, where a rare species known as Sesleria uliginosa occurs in Poland. A couple of sites hosting this association in the Nida Basin were described in the 1920s and 1950s. All these stands are now situated in the areas designated as xerothermic nature reserves. The study aimed at describing the present-day characteristics of this rare association, the most likely being endemic in Poland, as well as the changes that have occurred in it. The species diversity and the contribution of xerothermic plants have decreased significantly in terms of their number and cover coefficient. Some of the diagnostic species of the association have become extremely rare. Sesleria uliginosa is the only one without visible changes in their dominant position in the community. Mosses, that have played a significant role before, were among the vanished species. At the same time, an increase in number and cover of mesophilous meadows species was observed. Mesophilous grasses belong to the group of species growing in significance in the phytocoenoses. The observed changes in species composition were reflected in a statistically significant increase of nitrogen indicator value. The slow process of succession observed in the Seslerio-Scorzoneretum purpureae could be attributed to the lack of appropriate land use, e.g. mowing and grazing that have been ceased in the nature reserves.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2012, 81, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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