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    Wyświetlanie 1-5 z 5
    Tytuł:
    Lata nasienne i gryzonie, czyli o wpływie zweirząt na rozsiewanie nasion buka i dębu
    Autorzy:
    Bogdziewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/856991.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Tematy:
    botanika
    drzewa
    lata nasienne
    buk
    Fagus
    orzeszki bukowe
    dab
    Quercus
    zoledzie
    nasiona
    zoochoria
    gryzonie
    Źródło:
    Wszechświat; 2014, 115, 04-06
    0043-9592
    Pojawia się w:
    Wszechświat
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola sójki (Garrulus glandarius) w inicjowaniu przemian sukcesyjnych zbiorowisk leśnych z udziałem dębu (Quercus sp.)
    Role of jay (Garrulus glandarius) in initializing successional changes in forest communities with the participation of oak (Quercus sp.)
    Autorzy:
    Olszewski, A.
    Brzeziecki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/980357.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    zbiorowiska lesne
    sukcesja roslin
    dab
    Quercus
    zoochoria
    sojka
    Garrulus glandarius
    acorn
    jay
    oak
    ornitochory
    seed dispersal
    stand heterogeneity
    tree succession
    zoochory
    Opis:
    The ability of spatial expansion and conquering of new locations, suitable for growth, is one of the most important properties enabling different plant species (including forest trees) a permanent existence in a constantly changing (in space and in time) environment. In the course of evolution, plants developed several adaptations and mechanisms enabling them to capture new localities appropriate for life. The key role in this process is played by so called propagules, i.e. differently built spores, seeds and fruits. The main sources of forces and major transportation vectors for propagules are such mechanisms as: power of gravity (barochory), wind (anemochory), water (hydrochory), animals (zoochory) and man (antropochory). Among them, in case of tree species producing large seeds, containing bulky amounts of food resources, the most important role is played by zoochory. The special variant of zoochory is ornitochory, i.e. dispersion of plant propagules by birds. One of the best known and documented examples of ornitochory is dispersal of oak acorns by jays (Garrulus glandarius). The contemporary research shows that during a vegetation period one single bird is able to deposit even several thousends of acorns within the area of 10 to 100 ha. The dispersal distance in case of acorns distributed by jays is variable and depends on several factors, first of all, climatic conditions and degree of environmental heterogeneity. On average, acorns are distributed within a distance of several hundred meters from seed trees; sometimes they are disseminated at a distance of several (4−8, maximum 20) kilometers. As a rule, only a part of deposited acorns is uncovered and consumed by birds, thus at least some of them can germinate and produce new oak seedlings. It was also recently demonstrated that jays preferably put down acorns under the stand canopies composed by tree species other than oak, for instance, under Scots pine trees. Under favourable conditions, this initiates natural successional processes and leads to a significant conversion of tree stand composition. Considering a large scale and commonness of this phenomenon, it deserves an interest and attention, not in the case of natural forests only, but in the case of managed forests as well, in which the quasi−natural, successional processes, initiated by jays, can considerably contribute to a greater compositional and structural diversity of tree stands.
    Źródło:
    Sylwan; 2019, 163, 06; 479-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synzoochoryczne rozsiewanie żołędzi przez sójki Garrulus glandarius na powierzchniach zrębowych oraz pod drzewostanem
    Acorns dispersal by jays Garrulus glandarius onto clear-cuts and under the forest canopy
    Autorzy:
    Kurek, P.
    Dobrowolska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/989292.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    dab
    Quercus
    zoochoria
    sojka
    Garrulus glandarius
    synzoochoria
    zreby
    drzewostany
    odnowienia lasu
    quercus sp
    . acorn dispersal
    jay
    site preferences
    clear−cuttings
    Opis:
    The aim of this study was to analyse the preferences of jays in terms of oak acorn deposition in accordance to availability of some types of habitat. Investigations were carried out in forested areas of the Olsztyn Lakeland (NE Poland) with Scots pine forests domination. In autumn of 2014 and 2015 122 acorns of Quercus robur with concealed Telenax transmitters were served in four locations and then dispersed by jays Garrulus glandarius. Acorns with transmitters were radio tracked and localized after dispersion in different types of habitats. We distinguished three types of habitat: forest stands >40 years old, young forests <25 years old as well as clear−cuts and other open areas. The availability of habitats were estimated by 144 random points (36 per each location). Obtained availability/utilisation data were analyzed with chi square test ( =0.05). Results showed that majority (76.4%) of dispersed acorns were deposited under canopy of Scots pine stands, while only 8.2% were deposited on clear−cuts and other open areas. It seems that jays avoid to scatter its caches among clear−cuts and other open areas when availability of these types of environment is compared. Jays preferred to scatter the acorns under canopy of older (>40 years old) stands. It proves that the regeneration of oaks in clear−cuts is with low probability of success. The results suggest that density and high quality of regeneration that occurred on some of the clear−cuts seem to be a synchronization relic of oaks' mast crop and Scots pine fellings. In these circumstances the best solution to obtain oak regeneration is to synchronize the harvest with mast crops and carry it out immediately after acorn production to make an oak regeneration success guaranteed.
    Źródło:
    Sylwan; 2016, 160, 06; 512-518
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola ptaków w odnawianiu drzew ciężkonasiennych ze szczególnym uwzględnieniem buka Fagus sylvatica L.
    The role of birds in natural regeneration of large−seed trees with special reference to beech Fagus sylvatica L.
    Autorzy:
    Dula, P.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026747.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    ptaki
    zoochoria
    sojka
    botanika lesna
    lesnictwo
    Sitta europaea
    Garrulus glandarius
    buk zwyczajny
    nasiona
    orzechowka
    Nucifraga caryocatactes
    kowalik
    Fagus sylvatica
    ekologia
    drzewa lesne
    seed predation
    seed dispersal
    birds
    natural regeneration
    large−seeded trees
    beech
    coevolution
    jay
    nutoracker
    nuthatch
    Opis:
    The paper is a brief description of the role of birds in forest tree seed dispersal by synzoochory and seed consumption, as well as ecological consequences of these phenomena. Special attention has been drawn to the way seeds are stored by birds or in other words if the seeds can survive and be able to germinate. An overview of the most recent world literature connected with this subject was presented. An attempt has been made to assess the role of seed – eating birds in the natural forest ecosystem.
    Źródło:
    Sylwan; 2003, 147, 05; 65-75
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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