Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2011
Forfattere
Sverre KobroSammendrag
Det er ikke registrert sammendrag
Forfattere
Jessica Stäb Espen Govasmark Børge Holen Douwe Hoornstra Tommy Nesbakk Mirja Salkinoja-SalonenSammendrag
Det er ikke registrert sammendrag
Forfattere
Espen Govasmark Jessica Stäb Børge Holen Douwe Hoornstra Tommy Nesbakk Mirja Salkinoja-SalonenSammendrag
Det er ikke registrert sammendrag
Forfattere
jihong liu clarke Henry Daniell Jacqueline M NugentSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
This ESEE 2011 conference paper examines attitudes to private and public goods and bads from agriculture in Norway with a particular focus on organic agriculture. The issue is based on a survey among 939 Norwegians. The results show that the respondents strongly value public attributes of agriculture like a vivid countryside and cultural landscapes. Almost 60 percent of the sample emphasise that the government should aim to increase the production and sale of organic food. Respondents’ behaviour as consumers were investigated by collecting and analysing data that indicate which conditions respondents find most important when they buy milk, eggs, carrots and ketchup. Important conditions were taste, fresh, produced in Norway and no use of pesticides or fertilizers. The most important reasons for buying organic food were avoidance of pesticides, health and environmental concerns.
Sammendrag
Along the succession gradient of the boreal forest ecosystem, black grouse Tetrao tetrix inhabits the early and capercaillie Tetrao urogallus the latest stages. When converting old forest to clearcuts and plantations, commercial forestry has therefore been assumed to affect capercaillie negatively and to be favourable to black grouse. During a 30-year period (1979–2008) we monitored sympatric populations of the two species in a forest in southeast Norway based on annual spring and autumn censuses and radio-marked birds. During this period, the proportion of old, semi-natural forest was halved and clearcuts and young plantations increased accordingly. The grouse populations did not change as predicted. While the trend in August numbers of adult black grouse declined, males more than females, abundance of adult capercaillie remained unchanged. Number of males at leks showed similar patterns. Equally surprising, breeding success (number of chicks per female in August) of both species increased, thus indicating that the populations were regulated more by variation in adult survivorship than by recruitment of young birds. No correlations were found with changing climatic factors (precipitation and temperatures in winter and spring, snow depth and time of snow melt), except that year-to-year breeding success was positively correlated with minimum temperatures during 2 weeks posthatch. The results are explained by a combination of more flexible habitat selection than previously assumed and a changing predator regime: In the early period, nearly all capercaillie leks were located in old, semi-natural forest, but as plantations grew older (>30 years), new leks were established there. Similarly, while young capercaillie broods used old semi-natural forest almost exclusively when the study started, they frequently used middle-aged plantations, especially those with a ground cover of bilberry Vaccinium myrtillus, when these became common in later years. The increasing breeding success could largely be explained by more females rearing chicks successfully, presumably due to a marked decline in the main nest predator, the red fox Vulpes vulpes. A practice of thinning of the old, semi-natural forest some years prior to final harvesting probably facilitated predation of black grouse by goshawks Accipiter gentilis. Contrary to many beliefs, our results indicate that both capercaillie and black grouse are quite tolerant to changes in forest management regimes. In our study, numerical and functional responses of predators (mainly red fox and goshawk) apparently played a more important role in regulating grouse numbers than habitat factors per se.
Forfattere
Lillian ØygardenSammendrag
Det er ikke registrert sammendrag
Forfattere
V. Geethalakshmi Lakshmanan R. Srinivasan D.Rajalakshmi Nagothu Udaya Sekhar H AnnamalaiSammendrag
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Sammendrag
Det er ikke registrert sammendrag