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Submitted to: International Plant Resistance to Insects Workshop Abstracts & Proceedings
Publication Type: Abstract Only Publication Acceptance Date: 3/1/2012 Publication Date: 4/3/2012 Citation: Elliott, N.C. 2012. Prey foraging by Hippodamia convergens for cereal aphids on wheat [abstract]. 20th Biennial International Plant Resistance to Insects Workshop, April 1-4, 2012, Minneapolis, MN. p. 26. Interpretive Summary: Technical Abstract: We investigated predation by adult convergent lady beetle, Hippodamia convergens Guerin-Meneville, on English grain aphid, Sitobion avenae L., on wheat, Triticum aestivum L., plants in a laboratory arena, and developed a functional response model for the number of aphids eaten by an adult female convergent lady beetle. Beetle hunger and the number of aphids per plant were significantly correlated with the time spent searching a wheat plant and the number of aphids eaten during the plant visit. Partial correlation coefficients for hunger after adjusting for the effect of the number of aphids per plant were not significant for the time spent searching a plant or for the number of aphids eaten during a plant visit. Knowledge of the number of aphids per plant was sufficient for predicting searching time and predation. A Holling Type II functional response model was developed and tested. Comparison of the expected proportion of English grain aphids eaten versus the observed proportion eaten showed that there was no statistically significant bias in model predictions. However, wide variation in observed versus predicted predation rates was evident. We investigated predation by adult convergent lady beetle, Hippodamia convergens Guerin-Meneville, on English grain aphid, Sitobion avenae L., on wheat, Triticum aestivum L., plants in a laboratory arena and developed a functional response model for the number of aphids eaten by an adult female convergent lady beetle. Beetle hunger and the number of aphids per plant were significantly correlated with the time spent searching a wheat plant and the number of aphids eaten during the plant visit. Partial correlation coefficients for hunger after adjusting for the effect of the number of aphids per plant were not significant for the time spent searching a plant or for the number of aphids eaten during a plant visit. Knowledge of the number of aphids per plant was sufficient for predicting searching time and predation. A Holling Type II functional response model was developed and tested. Comparison of the expected proportion of English grain aphids eaten versus the observed proportion eaten showed that there was no statistically significant bias in model predictions. However, wide variation in observed versus predicted predation rates was evident. |
