Faculty of Forestry & Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6C2


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Natural Resources Canada, Canadian Forest Service – Atlantic Forestry Centre, PO Box 4000, 1350 Regent Street, Fredericton, New Brunswick, Canada E3B 5P7
Natural Resources Canada, Canadian Forest Service – Atlantic Forestry Centre, PO Box 4000, 1350 Regent Street, Fredericton, New Brunswick, Canada E3B 5P7
Natural Resources Canada, Canadian Forest Service – Atlantic Forestry Centre, PO Box 4000, 1350 Regent Street, Fredericton, New Brunswick, Canada E3B 5P7
Faculty of Forestry & Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6C2
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Xem thêm: Công Thức Tính Hiệu Suất Của Nguồn Điện Được Xác Định Bằng, Công Thức Hiệu Suất Của Nguồn Điện

Food quality can influence the performance of immature insects & their interactions with pathogens, such as viruses. In manipulative field studies, virus-free caterpillars of the whitemarked tussock moth (WMTM) (Orgyia leucostigma (Smith)) had higher survival, more female-biased sex ratios, & were larger when feeding on white birch (Betula papyrifera Marshall) versus balsam fir (Abies balsamea (Linnaeus) Miller) or red spruce (Picea rubens Sargent). Subsequent laboratory studies with two nucleopolyhedroviruses, derived from WMTMs và Douglas-fir tussock moths, indicated that caterpillars fed high chất lượng food (i.e., artificial diet) prior khổng lồ infection had less mortality associated with virus infection than those feeding on lower chất lượng foliage (i.e., birch). In field studies, caterpillars fed birch following infection had significantly lower mortality than those feeding on relatively lower quality foliage (i.e., balsam fir). We postulate that higher nutritional unique in artificial diet relative lớn birch (previrus-ingestion nutrition) và in birch relative khổng lồ balsam fir foliage (postvirus-ingestion nutrition) has a positive effect on the ability of tussock moth caterpillars to lớn resist or recover from viral infections, although the specific mechanisms responsible for observed resistance remain unclear.


La qualité des éléments nutritifs peut influencer la performance des insectes immatures ainsi que leurs interactions avec leurs pathogènes, tels que les virus. Des études de terrains indiquent que les chenilles à houppes blanches (Orgyia leucostigma (Smith)) ont une meilleure survie, une proportion des sexes biaisée vers les femelles et sont plus grosses quand elles se nourrissent de bouleau à papier (Betula papyrifera Marshall) plutôt que de sapin baumier (Abies balsamea (Linnaeus) Miller) ou d’épinette rouge (Picea rubens Sargent). Des études de laboratoire ont ensuite indiqué que les chenilles nourries d"une diète de haute qualité (par ex., diète artificielle) avant l"ingestion virale avaient un taux de mortalité associé à deux nucléopolyhedrovirus isolés de la chenille à houppes blanches et de la chenille à houppes du Douglas taxifolié moins élevé que celles nourries de feuillage de moindre qualité (c.-à-d., bouleau). Des études de terrain ont aussi démontré que la mortalité de chenilles nourries de bouleau après l"infection était significativement moindre que celle des chenilles nourries de feuillage d"une qualité comparativement moindre (c.-à-d., sapin baumier). Nous postulons que la qualité nutritionnelle supérieure de la diète artificielle comparativement au bouleau (nutrition pré-ingestion virale), et du bouleau comparativement au sapin baumier (nutrition postingestion virale) a eu un effet positif sur la capacité des chenilles à houppes blanche à parer ou à récupérer des infections virales; cependant les mécanismes spécifiques qui sont responsables de cette résistance demeurent incertains.