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Wyszukujesz frazę "dispersal" wg kryterium: Temat


Wyświetlanie 1-5 z 5
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:
Dyspersja i przemieszczanie się dzików (Sus scrofa L.) w silnie zurbanizowanym krajobrazie polno−leśnym w Polsce centralnej
Dispersion and movement pattern of Wild boar (Sus scrofa L.) in agro-forestry landscape under strong pressure from urbanization in central Poland
Autorzy:
Nasiadka, P.
Powiązania:
https://bibliotekanauki.pl/articles/994102.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
zwierzeta lowne
dzik
Sus scrofa
wystepowanie
rozproszenie
przemieszczanie sie zwierzat
krajobraz polno-lesny
tereny zurbanizowane
Polska Centralna
wild boar
dispersal
migration
hunting
Opis:
The research analyses the use of space by the Wild boar living in a human−transformed landscape. CMR method was used. Animals were caught in two complexes from February 2009 to May 2010. Fifty boars were captured. Information on the location and hunting time were collected. Results show small range of activity of investigated Wild boars. Animals were shot within 4 km from the trapping place. The longest distance that Wild boar had passed amounted to over 20 km. Most boars survived up to 50 days from the date of their catch. The maximum survival time was 373 days. Small dispersion of Wild boars is probably caused by philopatry, sufficient food resources and shelter, and the ability to adapt to human presence near the refuges.
Źródło:
Sylwan; 2013, 157, 12; 937-945
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:
Zmienność przestrzenna i czasowa opadu bukwi na podstawie obserwacji w Babiogórskim i Ojcowskim Parku Narodowym
Spatial and temporal variation in seed fall of beech in the Babia Góra and Ojców National Parks
Autorzy:
Skrzydłowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1026403.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zmiennosc czasowa
buk zwyczajny
zmiennosc przestrzenna
produkcja nasienna
Babiogorski Park Narodowy
lesnictwo
Fagus sylvatica
Ojcowski Park Narodowy
drzewa lesne
fagus sylvatica
seed production
seed dispersal
seed viability
Opis:
Spatial and temporal pattern of seed fall of beech was examined in the subalpine and upland natural forests with prevailing beech. The obtained results point to several regularities associated with seed density, fraction of full seeds in the seedlot, date of seeding and constant of the spatial pattern of beech seed fall.
Źródło:
Sylwan; 2003, 147, 06; 79-86
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
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