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    Wyświetlanie 1-6 z 6
    Tytuł:
    Integration of Late Glacial and Holocene pollen data from Poland
    Autorzy:
    Walanus, A.
    Nalepka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/973646.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    palynology
    isopollen maps
    radiocarbon dating
    weighting function
    bootstrapping
    Vistulian Late Glacial
    Holocene
    Polska
    Opis:
    Quaternary palynological data are stored in tables which are typical computer database objects. The individual pollen table, in order to be integrated with other tables using computer-based methods, has to be attributed with (1) geographical coordinates, (2) dates attached to each row (sample) of the table, and (3) taxa names, common to all tables, attached to each column. In this paper, integration of individual lists of palynological taxa is shortly described, and some remarks are given on extracting data for selected time slices. The problem of dating of all pollen spectra, while few radiocarbon dates are available in the profile, is considered. Some mathematical models of age-depth relation are proposed, as well as incorporation of information derived from lithology of the profile. The algorithm of integration (averaging) of pollen percentages on the map of Poland is discussed. The techniques of bootstrap and so-called removed residuals are proposed as tools for assessment of reliability of isopollen lines. A possibility of construction of migration (rate of change) maps is also mentioned. The presented algorithm has been used to obtain hundreds of isopollen maps for the Holocene in the area of Poland .
    Źródło:
    Annales Societatis Geologorum Poloniae; 2004, 74, No 3; 285-294
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical correlation of many multidimensional geological records
    Korelacja numeryczna wielowymiarowych danych dla kilku profili gelogicznych
    Autorzy:
    Walanus, A.
    Nalepka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/191633.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Monte Carlo
    computer intensive
    dissimilarity coefficient
    data standardization
    Opis:
    It is frequent task to correlate profiles or cores basing on different measurements performed on the series of samples. The difficulty arises when there are many profiles and none is the main or reference one. The reason is that the number of possible correlations grows exponentially with the number of profiles. To resolve the problem a Monte Carlo method is adopted here, what makes it very probable to discover the best correlations in a reasonable amount of computing time. The quality of a correlation is measured by a metric of dissimilarity of the samples. The final result, given in graphical form, has a form of lines connecting correlative samples from different profiles. The number of lines (correlations across profiles) is user-defined and can vary from one to dozens. The number of profiles, samples, and variables depends only on the computational resources. Large problems need longer computation times to achieve stable results.
    Korelowanie dwóch lub kilku sekwencji próbek z profilu, na podstawie wyników różnych pomiarów wykonywanych dla próbek, jest jednym z najczęściej wykonywanych zadań. Jednak w sytuacji korelow nia większej liczby równorzędnych profili, ze względu na wykładniczo rosnącą z liczbę profili liczbę możliwych korelacji, zadanie staje się trudne. Zaproponowane rozwiązanie ograniczenia czasu poszukiwania najlepszej korelacji wykorzystuje metodę Monte Carlo. Otrzymany wynik korelowania, aczkolwiek niekoniecznie najlepszy, najprawdopodobniej będzie bardzo bliski optymalnej korelacji. Jakość korelacji mierzona jest za po - mocą współczynnika niepodobieństwa próbek. Końcowy wynik działania omawianego programu przedstawiany jest w postaci graficznej, w postaci pewnej (zadanej) liczby linii łączących po - dobne poziomy. Liczba korelowanych profili, próbek i zmiennych zależy jedynie od wielkości pamięci komputera. Czas zawsze można dowolnie ograniczyć, jed nak warto wtedy sprawdzi? stabilność uzyskanego wyniku obliczeń.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2006, 76, No 2; 215-224
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regional maps of rate of change of pollen percentage as a tool for climate change visualization
    Autorzy:
    Walanus, A.
    Nalepka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059720.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    isopollen maps
    rate of change map
    Opis:
    Isoline maps of percentage of pollen, obtained for different time horizons through the Holocene, are a typical tool for palaeobotanical studies. In connection with the West Carpathian project the authors have developed the idea of graphically presenting on the map a rate of change of the pollen percentage. Such a map is based on the data from two time horizons. The precision of such a type of map, which shows the %/change/100 yrs, and in which the value can be negative as well as positive, is lower that of a typical isopollen map. However, this type of map gives a direct insight into changes in the plant cover, which are related to climate change.
    Źródło:
    Geological Quarterly; 2013, 57, 2; 353--356
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The distribution of Elatine hexandra (Lapierre) DC. (Elatinaceae)
    Autorzy:
    Popiela, A.
    Lysko, A.
    Wieczorek, A.
    Nalepka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/59232.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    species distribution
    Elatine hexandra
    Elatinaceae
    vascular plant
    chorology
    Europe
    plant species
    taxonomy
    Opis:
    General distribution map of Elatine hexandra (Lapierre) DC. was made based on literature and web-based data confronted and possible reasons of the formation of taxon's distribution range and history are discussed.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability of the environment at the end of the Eemian Interglacial as illustrated by the isopollen maps for Poland
    Autorzy:
    Kupryjanowicz, M.
    Granoszewski, W.
    Nalepka, D.
    Pidek, I. A.
    Walanus, A.
    Balwierz, Z.
    Fiłoc, M.
    Kołaczek, P.
    Majecka, A.
    Malkiewicz, M.
    Nita, M.
    Noryśkiewicz, B.
    Winter, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060182.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    palaeoclimate
    intra-interglacial cooling
    vegetation history
    isopolles
    pollen analysis
    Opis:
    Many terrestrial pollen profiles from Poland (and a few pollen records from other parts of Central Europe) show the end of the last interglacial (Eemian, MIS 5e) to have been characterized by climatic and environmental instability. This is expressed by a strong, rapid cooling in the middle part of the pine phase ending this interglacial (E7 regional pollen assemblage zone), and then a re-warming at the very end of this phase, immediately before the transition to the glacial conditions of the last glaciation (Vistulian, Weichselian, MIS 5d). We have characterized the regional distribution of these climatic fluctuations in Poland on the basis of isopollen maps prepared for the Eemian Interglacial based on palynological data from 31 Polish pollen profiles. These maps show unequivocally that the intra-interglacial cooling at the end of the Eemian Interglacial was a transregional phenomenon, which was reflected very clearly by a temporary openness of vegetation across the whole of Poland. It was associated with a distinct decrease in pine forest areas and an increase in birch forests and open communities of cold steppe type with a domination of Artemisia. The pronounced climate and environment instability during the last phase of the Eemian Interglacial may be consistent with it being a natural phenomenon, characteristic of transitional stages. Taking into consideration the currently observed global warming, coinciding with a natural cooling trend, the study of such transitional stages is important for understanding the underlying processes of climate change.
    Źródło:
    Geological Quarterly; 2016, 60, 1; 225--237
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postglacial migration dynamics helps to explain current scattered distribution of Taxus baccata
    Autorzy:
    Iszkulo, G.
    Pers-Kamczyc, E.
    Nalepka, D.
    Rabska, M.
    Walas, L.
    Dering, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41150.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    yew
    Taxus baccata
    migration dynamics
    endangered species
    Quaternary
    human impact
    competition
    Opis:
    Taxus baccata L. has a scattered distribution and the decline of yew woodlands is observed across the entire species range. Passively protected populations in the central and northern part of their distribution are declining without human intervention. However, the establishment of new yew populations is observed in habitats that have been significantly transformed by humans. The following question need to be answered: why do yews find better in environmental conditions that have been strongly modified by humans compared to natural systems? The Quaternary history might be the key to understand the current yew situation. As suggested by palaeobotanical studies, pollen of T. baccata was observed at optima of the interglacials, but in subsequent periods, it has been displaced by that of other shade-tolerant species. Pollen diagrams indicate that after the last glaciation, the yew did not appear earlier than other shade-tolerant species and did not have the opportunity to become common in occurrence, as in previous interglacial periods. As a result, yews occur only as relict populations within environmental islands where the competition with other shade-tolerant species is low. The negative human impact on yew is well-documented, but limitations resulting from the biology of this species are also very important. T. baccata is a species whose current scattered distribution may explain the Quaternary history. Yew situation is better in artificial conditions because people reduce competition from other trees species and deer pressure. Possible positive impact of human on yew distribution in the past is also discussed. The current biological condition of this species suggests the need for active protection.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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