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    Wyświetlanie 1-2 z 2
    Tytuł:
    Grupy wiekowe byków jelenia szlachetnego (Cervus elaphus L.), w ramach których powinna być prowadzona ich selekcja osobnicza na Warmii i Mazurach
    Age grouping of red deer (Cervus elaphus L.) stags for the selection of individuals in Warmia and Mazury regions
    Autorzy:
    Zalewski, D.
    Szczepański, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/973608.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Warmia
    Mazury
    grupy wiekowe
    selekcja osobnicza
    punktacja
    Cervus elaphus
    byki
    wycena CIC
    łowiectwo
    popolacje zwierząt
    leśnictwo
    jeleń europejski
    zwierzęta hodowlane
    zwierzęta łowne
    red deer
    age groups
    antler weight
    growth rate
    CIC score
    Opis:
    The aim of the paper was to distinguish age groups of red deer stags in compliance with age classes (I−III) operational in game management practices in order to carry out individual selection of red deer populations living in the Warmia and Mazury regions. The parameters taken for analyses were, among others: the sum of points on the CIC scale, antler weight, length of beams and body weight. Moreover, the rate of growth of body weight and the selected features of antlers were analysed to identify age groups of stags. The analysis of the data from measurements of all stags harvested in the Olsztyn Province during three hunting seasons 1988/1989, 1989/1990 and 1990/1991 showed that the sampled group contained selective, shootable and prospective stags, i.e. non−selective stags below 10 years of age culled contrary to the selection criteria. Stags from the last two groups formed the class of strong stags, i.e. stags with antlers developed above the standard for a given age. The experimental material presented in this paper consisted of antlers collected from 1704 red deer stags including 405−546 antlers from non−selective (strong) stags.
    Źródło:
    Sylwan; 2004, 143, 08; 43-51
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ leśnych zabiegów hodowlanych na nietoperze
    Impact of silvicultural treatments on bats
    Autorzy:
    Burgiell, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/986693.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    oddzialywanie na zwierzeta
    fauna
    nietoperze
    Chiroptera
    ekologia zwierzat
    bats
    ecology
    silvicultural treatments
    forest management
    lesnictwo
    lasy gospodarcze
    gospodarka lesna
    zabiegi hodowlane
    Opis:
    The paper synthesizes the knowledge on the impact of silvicultural treatments on bat populations. Forest management affects stand structure and composition, and silvicultural treatments exert both positive or negative impact on the activity of individual bat species. Studies published on the issue suggest that forest management may prove useful for the conservation of bat populations, especially in areas that are important to bats. Harvesting system influences spatial and age patterns as well as the share of open woodland areas in forests, which are used by majority of bat species. In particular, polycyclic harvesting systems result in a mosaic of open midforest areas of various size such as clearcuts, group shelterwood cuts and gaps in forest stands, which are very attractive for aging habitats to bats. Common noctules and parti−coloured bats prefer to hunt by flying at high speeds and altitudes above open midforest areas such as clearcuts and group shelterwood cuts. Serotine bats and Nathusius' pipistrelles use smaller gaps and stands treated with shelterwood cuts. Barbastellas and Bechstein's bats prefer more cluttered foraging habitats in dense vegetation and canopy, while long−eared bats fly slower and glean their prey from plants. Selection cutting and irregular group shelterwood methods, which have the fewest cutting constraints, contribute most significantly to creating a mosaic of diversely structured stands and open midforest areas. Forest stands managed with such harvesting systems are the most preferred foraging sites for the largest number of ecomorphological groups of bats. The thinning of trees at younger age reduces density, thus opening up new foraging sites or providing access to such sites to bats, which fly fast, but are less manoeuvre (e.g. common noctules). The loss of roosting habitats for maternity colonies due to tree cutting or microclimate changes in forest stands is the greatest threat from the forest management. Silvicultural treatments affect the structure of forest stands and, in consequence, bat populations. Sustainable forest management may be useful for bat conservation. Forest stands with diverse structure as well a mosaic of variously−sized midforest areas provide the best foraging and mating conditions for the highest number of bat species.
    Źródło:
    Sylwan; 2017, 161, 09; 738-747
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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