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| 2. |
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| 3. |
- Andren, Henrik, et al.
(författare)
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Viltpopulationernas storlek
- 2010
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Ingår i: Vilt, människa, samhälle. - 9789147094189 ; , s. 33-54
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Bokkapitel (populärvet., debatt m.m.)
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| 4. |
- Ball, John, et al.
(författare)
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Comparison of plant secondary metabolites and digestibility of three different boreal coniferous trees
- 2009
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Ingår i: Basic and Applied Ecology. - : Elsevier BV. - 1439-1791 .- 1618-0089. ; 10, s. 19-26
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Tidskriftsartikel (refereegranskat)abstract
- Moose (Alces alces L.) prefer to browse Pinus sylvestris Over Other coniferous trees. One reason for this preference might be due to differences in the chemical composition of various coniferous plants. and/or differences in digestibility. We evaluated the in-sacco digestibility of P. sylvestris, Pinus contorta and Picea abies using a fistulated cow, (Bos taurus). Additionally. we determined the chemical profile of the different plant species (with emphasis oil specific phenolics) mid we modified the concentration of the individual phenolic (+)catechin in plant m material of P. sylvestris to test the influence Of this p particular phenolic on digestibility in vitro (IVDMD). The in-sacco experiment revealed the highest digestibility of dry matter, and neural detergent fibre for P. sylvestris. In addition, the concentration of nitrogen was significantly higher, mid the concentrations of total phenolics mid condensed tannins were significantly lower in P. sylvestris than in the Other species. Individual phenolics showed high variation but were low in P. sylvestris, where is P. contorta and P. abies at least one species-specific phenolic compound of high concentration each. We found no changes in the digestibility of samples in which we experimentally elevated (+)catechin content. (C) 2007 Gesellschaft fur Okologie. Published by Elsevier GmbH. All rights reserved.
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| 5. |
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| 6. |
- Bergström, Roger, et al.
(författare)
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Effects of natural winter browsing and simulated summer browsing by moose on growth and shoot biomass of birch and its associated invertebrate fauna
- 2009
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Ingår i: Annales Zoologici Fennici. - : Finnish Zoological and Botanical Publishing Board. - 0003-455X .- 1797-2450. ; 46, s. 63-74
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Tidskriftsartikel (refereegranskat)abstract
- Plant responses to mammalian herbivores can be manifold. Browsing by large mammals such as moose may change plant growth and morphology, which, in turn, will change the food quality and availability for e.g. invertebrate herbivores sharing the same forage plant. Furthermore, the intensity and timing of herbivory may affect plant responses and future herbivore attack. In a field experiment, we tested whether simulated summer browsing and natural winter browsing by moose affects growth and morphology of birch Betula pendula, and whether possible changes had effects on abundance and defoliation by herbivorous invertebrates. The simulated summer browsing treatment was applied in two intensities (50% and 100% defoliation of long shoots) during two different periods of the growth season (mid-June and mid-July). Simulated summer browsing delayed the timing of budburst, reduced height and diameter growth and resulted in reduced defoliation by invertebrate herbivores indicating an induced defence. Winter browsing by moose reduced diameter growth, leaf biomass of short shoots but increased height growth, the abundance of aphids and defoliation by insect herbivores. The effects of herbivory on the timing of budburst, leaf biomass of long and short shoots and the abundance of aphids were more pronounced when the birches were both browsed in winter and artificially stripped. The timing of the artificial leaf stripping treatment was important for nearly all tested variables. Concluding, summer and winter browsing by moose can have opposing or additive effects on plant morphology and growth. Therefore, also indirect effects of mammalian herbivory on invertebrate communities feeding on the same plant may differ, depending on the browsing intensity, the season of browsing and even the timing of browsing within the same season.
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| 7. |
- Bergström, Roger, et al.
(författare)
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Föreningar och förbund
- 2016
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Ingår i: Jaktens historia i Sverige : vilt, människa, samhälle, kultur. - 9789147112944 ; , s. 274-289
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Bokkapitel (populärvet., debatt m.m.)
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| 8. |
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| 9. |
- Bergström, Roger, et al.
(författare)
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Impacts of moose (Alces alces) at different simulated densities on eco-morphological groups of soil mesofauna
- 2010
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Ingår i: Entomologica Fennica. - 0785-8760. ; 21, s. 168-180
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally tested the impact of browsing, defecation and urination corresponding to four different levels of moose population density on abundance and number of eco-morphological groups of soil mesofauna in a Swedish boreal forest. The study was carried out in three fenced exclosures representing different levels of productivity (from nutrient-rich to nutrient-poor). Moose impact on soil communities was evaluated by analysing abundance, richness and diversity of mesofaunal groups, and by means of a multi-taxa index based on ecomorphological groups, the Biological Soil Quality index (QBS). There was a negative impact of high moose densities on the abundance and richness of soil mesofauna. Furthermore, low-moderate moose densities had a positive impact on abundance and number of eco-morphological groups. We conclude that moose can have a large impact on soil-living mesofauna, and therefore probably soil decomposition processes and biological soil quality, in young boreal forest stands.
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| 10. |
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| 11. |
- Bergström, Roger, et al.
(författare)
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Jakt som näring och livsstil i Jämtland och Enaforsholm
- 2012
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Ingår i: Vid fjällets fot. Donatorn A.W. Bergsten och hans Enaforsholm i Västjämtland - från jaktvilla till fjällgård. - 9789186573294 ; :60
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 12. |
- Bergström, Roger, et al.
(författare)
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Lodjuret
- 2014
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Bok (populärvet., debatt m.m.)
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| 13. |
- Bergström, Roger, et al.
(författare)
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Of goats and spines - a feeding experiment
- 2012
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Ingår i: African Journal of Range and Forage Science. - : National Inquiry Services Center (NISC). - 1022-0119 .- 1727-9380. ; 29, s. 37-41
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Tidskriftsartikel (refereegranskat)abstract
- Spines in plants have evolved to reduce mammalian herbivory, and their main function may be to protect twigs more than photosynthetic tissue. Type and frequency of spines vary at different scales. We hypothesised that different types of spines affect animal foraging through different mechanisms. We studied feeding behaviour by twig-browsing goats in relation to two types of spines of Acacia tortilis using experimental manipulation of the occurrence of spines. Feeding time, number of biting actions, number and diameter of bites on trees (post-trial) and total intake were recorded. The removal of either long straight spines or short hooked spines resulted in no feeding responses by goats. The removal of both types of spines tended to increase feeding time resulting in more and larger bites with larger bite diameters and in increased total intake and utilisation compared to control branches. The removal of spines had no effects on feeding rate, expressed as biting actions per minute, number of twigs bitten per minute or intake rate (grams per minute). Both types of spines reduced total intake and utilisation of browse, but the functional mechanisms were different with the long straight spines mainly influencing bite size and short hooked spines mainly affecting number of bites.
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| 14. |
- Bergström, Roger, et al.
(författare)
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Om Försök Til et Swenskt Skogs- och Jagt-Lexicon
- 2010
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Ingår i: Försök Til et Swenskt Skogs- och Jagt-LEXICON af M. H. Brummer. - 9789185205950 ; :49, s. 19-41
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 15. |
- Bergström, Roger, et al.
(författare)
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Plant-Herbivore Interactions
- 2014
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Ingår i: Elephants and savanna woodland ecosystems: a study from Chobe National Park, Botswana. - : Wiley. - 9780470671764 ; , s. 189-206
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 16. |
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| 17. |
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| 18. |
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| 19. |
- Bergström, Roger, et al.
(författare)
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Utbildning och forskning
- 2016
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Ingår i: <em>Jaktens historia i Sverige: Vilt – människa – samhälle – kultur</em>. - Stockholm : Liber Hermods. - 9789147112944 ; , s. 291-300
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 20. |
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| 21. |
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| 22. |
- Carlsson, Lars, et al.
(författare)
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Adaptiv förvaltning
- 2010
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Ingår i: Vilt, människa, samhälle. - Stockholm : Liber. - 9789147094189 ; , s. 227-239
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 23. |
- Carlsson, Lars, et al.
(författare)
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Viltförvaltningens teoretiska grund
- 2010
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Ingår i: Vilt, människa, samhälle. - Stockholm : Liber. - 9789147094189 ; , s. 209-225
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Bokkapitel (populärvet., debatt m.m.)
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| 24. |
- Carlsson, Lars, et al.
(författare)
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Viltförvaltningens teoretiska grund
- 2010
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Ingår i: Vilt, människa, samhälle. - Stockholm : Liber. - 9789147094189 ; , s. 209-225
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 25. |
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