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- W2092189874 abstract "Abstract 1. Sugar-rich honeydew excreted (‘produced’) by insects feeding on phloem sap is a key energy flow in a range of temperate and tropical ecosystems. The present study measured honeydew produced by Ultracoelostoma sp. (Homoptera: Coelostomidiidae) scale insects feeding on Nothofagus solandri var. solandri (Hook f.) Oerst. trees in a temperate evergreen forest in New Zealand. Simultaneous measurements of environmental variables and canopy photosynthesis were conducted to allow separation of host-tree and environmental determinants of honeydew production. These relationships were further examined in experiments where canopy photosynthesis was manipulated by shading or plant nitrogen levels increased by foliar spray. 2. Rates of honeydew production varied nine-fold from a maximum (± 1 SE) of 64.4 ± 15.2 mg dry mass m−2 bark h−1 in early summer (December) to a minimum of 7.4 ± 4.2 mg m−2 h−1 in winter (August). Rates of production measured 1.4 m from the base of the trees’ stems varied significantly with stem diameter, and were higher on medium-sized (18 cm diameter) than small or large stems. 3. Rates of production were significantly related to environmental conditions over the hours preceding measurement (air temperature and air saturation deficit averaged over the preceding 24 and 12 h respectively). There was no evidence that rates of production were directly related to short-term changes in the supply of carbohydrates from the canopy (either when compared with measurements of unmanipulated photosynthetic rate, or after sugar levels were manipulated by shading 80% of host-trees’ leaf area), or to changes in phloem nitrogen content. 4. The results show that there is no clear effect of host-tree carbon supply on honeydew production; if production is related to photosynthesis, the effect of this is much less important that the large and significant direct effect of environmental conditions on honeydew production." @default.
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- W2092189874 date "2007-08-01" @default.
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- W2092189874 title "Separating host-tree and environmental determinants of honeydew production by Ultracoelostoma scale insects in a Nothofagus forest" @default.
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- W2092189874 doi "https://doi.org/10.1111/j.1365-2311.2007.00871.x" @default.
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