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1 February 2011 Insights into Herbivore Distribution and Abundance: Oviposition Preferences of Western Hemlock and Phantom Hemlock Loopers
Martin J. Steinbauer, Allan L. Carroll
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Abstract

Knowledge of the factors affecting host selection by herbivorous insects is essential to predictions of their distribution and abundance over landscapes. In the laboratory, we studied the oviposition preferences of two eruptive loopers (Lepidoptera: Geometridae) native to western Canada (western hemlock looper, Lambdina fiscellaria lugubrosa (Hulst), and phantom hemlock looper, Nepytia phantasmaria (Strecker)) for different species and condition of hosts. When offered a choice, phantom hemlock loopers laid nearly three times as many eggs on western hemlock, Tsuga heterophylla (Raf.) Sarg. (Pinaceae) as on either western redcedar, Thuja plicata Donn ex D. Don (Cupressaceae) or western white pine, Pinus monticola Douglas ex D. Don (Pinaceae). Western hemlock loopers were less specific, laying equal numbers of eggs on western hemlock and western redcedar, though fewer eggs were deposited on western white pine when compared with western hemlock. When offered western hemlock trees grown under different nutrient and shading regimes, phantom hemlock loopers preferred to oviposit on high nutrient hosts, irrespective of shading; western hemlock loopers exhibited a preference for high-nutrient hosts only if they were grown without shading. These patterns of host preference can be combined with information regarding forest composition to help quantify the conditional probability of western and phantom hemlock looper distibution and abundance.

© 2011 Entomological Society of Canada
Martin J. Steinbauer and Allan L. Carroll "Insights into Herbivore Distribution and Abundance: Oviposition Preferences of Western Hemlock and Phantom Hemlock Loopers," The Canadian Entomologist 143(1), 72-81, (1 February 2011). https://doi.org/10.4039/n10-046
Received: 12 November 2009; Accepted: 24 August 2010; Published: 1 February 2011
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