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Lack of strong induced or maternal effects in tussock moths (Orgyia vetusta) on bush lupine (Lupinus arboreus).
Oecologia 1995 August
Both induced and maternal effects may create delayed negative feedback on the population growth of herbivorous insects. I tested for these effects in a chronically dense population of tussock moths (Orgyia vetusta) feeding on bush lupines (Lupinus arboreus). Experimental bushes received different realistic levels of defoliation by tussock moths in the preceding year, and experimental moth larvae came from mothers that had experienced either high or low levels of crowding as larvae in the previous year. Weight of female moths at pupation was not affected by prior foliar damage, and showed only a weak (12%) effect of maternal crowding. Rates of early larval disappearance, from aerial dispersal ("ballooning") or other causes, were unaffected by either foliar damage or maternal crowding, and were very low except when larvae were placed on dead bushes. These results help to explain why the tussock moth population has maintained high densities at the study site for >10 years.
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