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1.
  • Anderbrant, O. (creator_code:aut_t)
  • A model for the temperature and density dependent reemergence of the bark beetle Ips typographus
  • 1986
  • record:In_t: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 40:1, s. 81-88
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • A model is presented that describes the reemergence of parent spruce bark beetles, Ips typographus, based on breeding density and temperature conditions. Laboratory data obtained at one constant temperature provide the distribution of reemergence time and different combinations of threshold temperatures and degreedays (°D) at mean reemergence. Of these combinations, 167.71 °D above 7.5 °C gave the best correspondence between model prediction and field data obtained from densely infested standing trees. The model was in good agreement with the reemergence pattern found for two groups of infested logs under different temperature conditions when adjusted for the lower breeding density. The applicability of the model in the study of bark beetle reproductive biology and in forest management is discussed. The method used to construct the model should be useful in developing other models for poikilothermic processes. Modèle déconivant la réémergence d'Ips typographus en fonction de la température et de la densité Ce modèle décrit la réémergence d'adultes d'I. typographus L. (Coleoptera, Scolytidae) en fonction de la densité et de la température. Les résultats obtenus en laboratoire à des températures constantes fournissent la distribution des réémergences et pour les dates de réémergence moyenne les différentes combinaisons de température de seuil et de degré de jour (°D). De toutes ces combinaisons, 167.71 °D au‐dessus de 7,5 °C fournit la meilleure concordance entre les prévisions du modèle et les observations dans la nature à partir d'arbres fortement attaqués. Le modèle a montré un bon accord avec la réémergence observée dans deux groupes de branches attaquées dans différentes conditions de la température quand il a été ajusté aux faibles densités d'élevage. La discussion examine les possibilités d'application du modèle à l'étude de la biologie de la reproduction d'I. typographus et à l'aménagement forestier. La méthode utilisée pour construire le modèle pourrait être employée pour en développer d'autres chez des poikilothermes. 1986 The Netherlands Entomological Society
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4.
  • Anderbrant, O., et al. (creator_code:aut_t)
  • Diprionyl esters attractive to males of the dailing pine sawfly Neodiprion dailingensis Xiao et Zhou (Hym., Diprionidae) in north-eastern China
  • 1997
  • record:In_t: Journal of Applied Entomology. - 0931-2048. ; 121:5, s. 281-283
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The attraction of male Neodiprion dailingensis Xiao et Zhou to pheromone substances identified from other Neodiprion species was tested in plantations of Pinus tabulaeformis Carr. in Liaoning Province in north-eastern China. Both the acetate and propionate of (2S,3S,7S)-3,7-dimethyl-2-pentadecanol (diprionol) were highly attractive. An addition of 10% of the (2S,3R,7R)-isomer did not significantly reduce the catch to the acetate. The (2S,3R,7R)-isomer was not attractive by itself. This is the first pheromone study of a species belonging to the recently described East Asian group of Neodiprion. The response of N. dailingensis males is similar to that of N. sertifer males in eastern part of Asia.
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5.
  • Anderbrant, O. (creator_code:aut_t)
  • Dispersal of reemerged spruce bark beetles, Ips typographus (Coleoptera, Scolytidae) : a mark‐recapture experiment
  • 1985
  • record:In_t: Zeitschrift für Angewandte Entomologie. - : Wiley. - 0044-2240. ; 99:1-5, s. 21-25
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • An experiment to investigate the dispersal and supposed reattack by parent spruce bark beetles, Ips typographus (L.), was performed. More than 20,000 parent beetles were marked with fluorescent powder and immediately released from platforms when they reemerged from trees attacked during the spring swarming. Thirty‐eight marked and over 8000 unmarked beetles were trapped on sticky traps covering 21.6 m2 and placed on 21 trees within 30 m from the platforms. It was estimated that less than 4% of the trapped beetles had reemerged from trees within the 30 m. Verbreitung von ausgeflogenen Fichtenborkenkäfern, Ips typographus L. (Col., Scolytidae). Ein Markierungs‐Wiederfang‐Experiment Es wurde ein Experiment zur Ausbreitung und des Wiederbefalls durch Altkäfer von Ips typographus nach Verlassen ihrer ersten Brut durchgeführt. Mehr als 20 000 Käfer wurden beim Schlüpfen abgefangen, mit Fluoreszenz‐Puder markiert und von zwei Plattformen in unmittelbarer Nähe der Schlüpforte freigelassen. 38 markierte und mehr als 8000 unmarkierte Käfer wurden an Leimfallen (zusammen 21,6 m2), befestigt an 21 Bäumen in maximaler Entfernung von 30 m von den zwei Plattformen, gefangen. Es wird geschätzt, daß weniger als 4% der gefangenen Käfer aus den in Plattformnähe (30 m) befindlichen Brutbäumen stammten. 1985 Blackwell Verlag GmbH
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6.
  • Anderbrant, O., et al. (creator_code:aut_t)
  • Ecology of the Dutch elm disease vectors Scolytus laevis and S. scolytus ( Coleoptera : Scolytidae) in southern Sweden.
  • 1987
  • record:In_t: Journal of Applied Ecology. - : JSTOR. - 0021-8901. ; 24:2, s. 539-550
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Two rings of pheromone-baited sticky traps surrounded the elm wood at 20-300m and 1-2km outside the forest edge. Most Scolytus were caught at sites in the inner ring near the forest; <1% of the total were caught in the outer ring. Emergence from logs and trap catches showed a first peak in July. Flight activity was recorded from the end of May to September for both species. A 2nd peak of activity was evident in August in 2 of 3yr for S. scolytus.-from Authors
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7.
  • Anderbrant, O., et al. (creator_code:aut_t)
  • Electrophysiological and morphological characteristics of pheromone receptors in male pine sawflies, Diprion pini (Hymenoptera : Diprionidae), and behavioural response to some compounds
  • 1995
  • record:In_t: Journal of Insect Physiology. - : Elsevier BV. - 0022-1910. ; 41:5, s. 395-401
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The morphology and physiology of pheromone receptors on the antennae of male pine sawflies, Diprion pini L., were investigated. Using scanning electron microscopy, five sensillar types were recognized. The type shown to be pheromone sensitive has a long (50-70 μm) cuticular hair, is single-walled, and is innervated by 8 or 9 sensory cells as revealed by transmission electron microscopy. Electroantennography (EAG) showed similar activity of the acetate and propionate of (2S,3R,7R)-3,7-dimethyl-2-tridecanol, precursor of the main constituent of the female-produced sex pheromone. No other isomer induced any significant response. Single-sensillum recordings confirmed the results of the EAG, and also showed that several neurons were excited by the active compound. EAG recordings and combined gas chromatographic-electroantennographic detection indicated that esters of three 3,7-dimethyl-2-pentadecanol (diprionol) isomers were active, but field tests could not demonstrate any behavioural effect. Diprionol esters are used as sex pheromones by all other pine sawflies investigated so far, and D. pini is thus the first diprionid species shown to use a different sex pheromone.
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8.
  • Anderbrant, O., et al. (creator_code:aut_t)
  • Feeding by Scolytus bark beetles to test for differently susceptible elm varieties
  • 2017
  • record:In_t: Journal of Applied Entomology. - : Wiley. - 0931-2048 .- 1439-0418. ; 141:5, s. 417-420
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Dutch elm disease (DED), caused by the fungi Ophiostoma ulmi and O. novo-ulmi, has reduced elm populations severely in Europe and North America. Breeding programmes are in action to find less susceptible elm varieties suitable for re-establishing elm stands. Bark beetles, mainly Scolytus spp., are the only known natural vectors of DED. During twig feeding, beetles transfer Ophiostoma spores to healthy elms. Thus, less palatable elms should run a lower risk of DED infections. In feeding preference bioassays, we offered twigs from elms exhibiting different degree of susceptibility to O. novo-ulmi, together with non-host trees to Scolytus beetles. Scolytus multistriatus preferred wych elm, Ulmus glabra, to 100% in two-choice tests, whereas S. laevis did not discriminate between a tolerant and a susceptible variety of field elm, U. minor. We suggest that the feeding assay is useful as a low-tech method in breeding programmes for evaluating the suitability of promising elm genotypes to vector insects.
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