Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2012
Authors
Arild AndersenAbstract
The present paper comments on thirty-three of the forty-seven species belonging to six Agromyzidae genera and presently known to occur in Norway. Thirteen species are reported new to the Norwegian fauna belonging to the family Agromyzidae. The species are: Amauromyza (Cephalomyza) chenopodivora Spencer, 1971, Amauromyza (Cephalomyza) monfalconensis (Strobl, 1909), Cerodontha (Butomomyza) rohdendorfi Nowakowski, 1967, Cerodontha (Butomomyza) scutellaris (Roser, 1840), Cerodontha (Cerodontha) fulvipes (Meigen, 1830), Cerodontha (Cerodontha) stackelbergi Nowakowski, 1972, Cerodontha (Dizygomyza) caricicola (Hering, 1926), Cerodontha (Icteromyza) capitata (Zetterstedt, 1848), Cerodontha (Poemyza) pygmina (Hendel, 1931), Metopomyza flavonotata (Haliday, 1833), Metopomyza scutellata (Fallen, 1823), Metopomyza xanthaspioides (Frey, 1946) and Aulenagromyza buhri (de Meijere, 1938). In addition new regional data is given for twenty species previously reported from Norway. The biology of the larva, when known, and the distribution in Norway and Europe are commented on for each of the species.
Authors
Signe Kynding Borgen Hanne Lunde Weichel Lars Bakken Marina Azzaroli Bleken Tor Arvid BrelandAbstract
No abstract has been registered
Authors
Klaus Mittenzwei David S. Bullock Klaus SalhoferAbstract
No abstract has been registered
Authors
M Ashraful Islam Goutam Kuwar Jihong Liu Clarke Dag-Ragnar Blystad Hans Ragnar Gislerød Jorunn Elisabeth Olsen Sissel TorreAbstract
Abstract Strict control of morphogenesis is essential in production of potted poinsettia. Commonly, this is obtained by the use of plant growth retardants (PGRs), often in combination with early morning temperature drops. Due to negative effects on human health and the environment, the use of PGRs is becoming restricted. Also, energy-saving growth regimes and periods of high temperatures limit effective use of temperature drops. In the present study the use of a high proportion of blue (B) light provided by light emitting diodes [LEDs, 20% blue (B), 80% red (R)] was compared with traditional high pressure sodium (HPS) lamps (5% B) providing similar phytochrome photostationary state to produce compact poinsettia plants. Both in the greenhouse and growth chamber, all cultivars were 20–34% shorter for LED compared to HPS grown plants. Also, leaf and bract area as well as chlorophyll content and total dry matter accumulation were lower under LED. The LED did not delay bract color formation, visible cyathia and flowering compared to HPS, and no difference in post production performance (cyathia/bract abscission or necrosis) between the two light treatments was found. The effect of end of day-red (EOD-R) lighting combination with LED and HPS supplemental lamps during the photoperiod in the greenhouse was also investigated. Reduced stem extension (13%) was observed under HPS only and for one of the two cultivars tested, whereas under the LED regime, there was no effect of EOD-R lighting.
Authors
Anna Birgitte MilfordAbstract
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Authors
Aruppillai Suthaparan Sissel Torre Leiv M. Mortensen Hans Ragnar Gislerød Knut Asbjørn Solhaug Arne Stensvand David M. GadouryAbstract
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Authors
Jonathan Edward Colman Diress Tsegaye Alemu Christian Pedersen Ruben Eidesen Herbjørg Arntsen Øystein Holand Alex Mann Eigil Reimers Stein Ragnar MoeAbstract
Interspecific interaction among sympatric ungulates is important in management and conservation. We investigated behavioral interference between sympatric wild or semidomestic reindeer (Rangifer tarandus tarandus) and sheep (Ovis aries) in two field studies and one enclosure experiment. For free-ranging wild and semidomestic reindeer, interference between the two species increased with decreasing distances, occurring only at less than 200 m and 30 m, for wild and semidomestic reindeer, respectively, and neither species consistently dominated the other. In a controlled, duplicated experiment we tested interference and confrontations at the feeding patch level among semidomestic reindeer and sheep within 40 × 50 m enclosures. When new reindeer or sheep were introduced into enclosures already occupied by reindeer, new reindeer resulted in significantly more interference and confrontations among individuals compared to new sheep; i.e., intraspecific interference was more prevalent than interspecific interference at equal densities. For all study areas, confrontations decreased with time after “first encounter,” indicating cohabituation. A sympatric use of pastures was not visually disruptive for recorded grazing behavior for either species.