the tritrophic system hyptis suaveolens (lamiaceae) - agromyzid leafminers (diptera: agromyzidae) - parasitoids (hymenoptera): effects of herbivore density, host plant patch size, and habitat complexity on parasitism rate

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ID: 168129
2009
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Abstract
In this study a tritrophic system was evaluated to measure the contributions of the insect host density and its host plant concentration in simple and diversified habitat on the rate of parasitism. The system was composed of the plant Hyptis suaveolens, two species of agromyzid leafminers, and three morphospecies of parasitoids. The parasitism rate, patch size, and habitat complexity were found to be interdependent. If only the habitat complexity or patch size was take into account the differences in parasitism rate are not significant, although habitat diversity seemed to contribute more than the host plant concentration to increase the parasitism rate. The leaves or plants with different number of mines were equally attacked by the parasitoids. The results were representative of what happened to the leafminers at different host plant densities under the homogeneous and heterogeneous habitat condition. This work could help to reinforce the idea of the importance of the plant diversity for enhancing the biological control of the pests by the parasitoids in the managed ecosystems.
Foi avaliado um sistema tritrófico para medir os efeitos da densidade de insetos minadores e a concentração da planta hospedeira em habitats simples e diversificados sobre a taxa de parasitismo. O sistema era composto pela planta Hyptis suaveolens, duas espécies de agromizídeos minadores de folhas e três morfoespécies de parasitóides. A taxa de parasitismo, tamanho da mancha e a complexidade do habitat foram interdependentes. Se levarmos em consideração apenas a complexidade ou tamanho de mancha, as diferenças na taxa de parasitismo não foram significativas, embora a diversidade de habitat pareça ter contribuido mais do que a concentração da planta hospedeira para aumentar a taxa de parasitismo. Folhas ou plantas com diferentes números de minas foram igualmente parasitadas. Nossos resultados são representativos do que acontece com insetos minadores em diferentes densidades de plantas e condição do ambiente - homogêneo ou heterogêneo. Este trabalho ajuda a reforçar a idéia de que a diversidade de plantas no sistema ajuda a aumentar o controle biológico de pragas por parasitóides.
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Authors ;Jarbas Marcal de Queiroz;Maria Alice Garcia
Journal current drug delivery
Year 2009
DOI
10.1590/S1516-89132009000300008
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300008
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