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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Forest Ecology and Management 61 (1993), S. 127-136 
    ISSN: 0378-1127
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 135 (1994), S. 513-515 
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9761
    Keywords: habitat isolation ; thresholds ; quantification ; deciduous ; long-tailed tit ; Aegithalos caudatus ; forest management ; conservation ; Sweden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We assessed the habitat patch occupancy of a deciduous-mixed forest specialist, the long-tailed tit (Aegithalos caudatus), in a 1000 km2 conifer dominated landscape in relation to two landscape parameters, namely proportion and isolation of suitable habitat. Data from five consecutive spring seasons were used and within habitat variation controlled for. The occurrence of long-tailed tits was positively related to the amount of habitat within 1 km2 (p=0.0007) and negatively related to the distance between habitat patches (p〈0.0001). When combined, the two variables explained 〉78% of the variation in local patch occupancy. There were distinct thresholds in these landscape variables for the probability of local long-tailed tit presence. In the model the probability increased from 0.1 to 0.8 when interpatch distance decreased from 500 to 100 m with 5% total habitat coverage. With a total proportion of 15% suitable habitat, the same probability jump occurred when interpatch distance changed from 900 to 500 m. The general importance of defined measurements and quantified threshold levels for species conservation and landscape management is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1939
    Keywords: Hazel grouse ; Landscape ecology ; Habitat fragmentation ; Matrix ; Sweden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this study was to determine the effect of matrix on the occurrence of hazel grouse (Bonasa bonasia) in habitat fragments. The study was conducted in two kinds of landscape: (1) an agricultural landscape, where the censused forest habitat fragments were surrounded by farmland, and (2) in an intensively managed forested landscape, where the censused habitat fragments were surrounded by nonhabitat coniferous forest. Occupied and unoccupied habitat fragments in the agricultural landscape differed significantly in distance to the nearest suitable continuous habitat, with hazel grouse occurring only in habitat fragments closer than 100 m from continuous forest. In the intensively managed forest landscape, the effect of isolation was less evident, but there might be a threshold around 2 km. Effects of isolation occurred over much shorter distances when the surrounding habitats consisted of farmland than when it was forested habitats. The size of the habitat fragments was important in both landscapes, with larger habitat fragments more often containing hazel grouse.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We tested the hypothesis that synchronous fluctuations in small game species in boreal Fennoscandia are caused by varying predation pressure. The main prey of predators are the cyclically superabundant voles. Small game species (alternative prey) are rare compared to voles. The following 4 predictions were checked: (1) Predators should shift their diet from main prey to alternative prey as main prey decline. — This was confirmed using data on red fox (Vulpes vulpes L.) diet.; (2) The mortality rate of alternative prey should be inversely correlated to the abundance of main prey. — This was true for mountain hare (Lepus timidus L.) mortality rates and the rate of nest predation on black grouse (Tetrao tetrix L.).; (3) The total consumption of prey by all the predators should at least equal the critical losses in alternative prey during a decline year. — A tentative estimate of predator consumption amounted to 10 times the losses in grouse and hare.; and (4) The absence of synchrony between the species in the boreonemoral region should be associated with a more diverse diet of predators. — This was the case for red fox diets throughout Sweden. Although all 4 predictions were confirmed, we could not necessarily exclude other hypotheses involving changes in quality or quantity of plant food.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 82 (1995), S. 3-11 
    ISSN: 1573-2932
    Keywords: boreal forest ; Russia ; Scandinavia ; co-operation ; sustainable use ; forest history ; research, education, management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The boreal forest is in transition. Large areas in remote regions are still in a pristine state, but extensive exploitation or intensive management for wood production dominates in Russia, Canada and the Nordic countries. The broadened view that forests are sources of other products than wood as well as of biodiversity is gradually becoming internationally accepted. To sustain the boreal forest for the future it must be realised that the forest has to be sustained as a system rather than as a number of utilities that can be considered separately. In northern Europe the situation is particularly striking with a strong contrast between the adjacent boreal forests in Scotland, Sweden and Finland on the one hand, and the north-west of Russia on the other. The two regions differ by history, type of land use and economic system but they are basically biologically similar. Combining sustainable wood production and maintenance of biodiversity and other values means setting limits to the intensity and extent of forest management. If the impact has been large, it is also necessary to build more natural features into managed systems. Developing a sustained boreal forest system by management of forests and forests reserves can be more efficient if research, education and management are well integrated. Scientists, teachers and managers must meet frequently and interact. In this way the time-lag between the advent of new knowledge and its implementation in the field can be reduced. We argue that co-operation among contrasting regions like the east and the west provides a unique opportunity for such integration. We review the problems and requirements in the west and the east, respectively, by contrasting Scotland, Sweden and the Komi Republic in Russia. The experiences are different and therefore complementary to each other. This assures long-term benefits of joint action.
    Type of Medium: Electronic Resource
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