AUTHOR=Maselou Dionyssia A. , Anastasaki Eirini , Milonas Panagiotis G. 

TITLE=The Role of Host Plants, Alternative Food Resources and Herbivore Induced Volatiles in Choice Behavior of an Omnivorous Predator

JOURNAL=Frontiers in Ecology and Evolution

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2018.00241

DOI=10.3389/fevo.2018.00241

ISSN=2296-701X

ABSTRACT=<p><italic>Macrolophus pygmaeus</italic>, Rambur (Heteroptera, Miridae) is a generalist predator found on various plant species and has also the ability to feed both on animal and plant tissue. Foraging behavior of <italic>M. pygmaeus</italic> and ultimately its efficacy as a biological control agent, is known to be affected by olfactory stimuli. Here, we elaborate on the response of this omnivore predator to volatiles produced by host plants by conducting olfactometric bioassays under laboratory conditions. In particular, we explored: (i) the relationship between previous experience and plant choice of <italic>M. pygmaeus</italic> nymphs by comparing its attractiveness to pepper and aubergine plants and (ii) how the presence of an aphid prey, <italic>Myzus persicae</italic> (Sulzer), or floral resources may influence choices made by <italic>M. pygmaeus</italic>. When the two host plants were provided, aubergine plants were found to be more attractive than pepper plants, regardless the previous experience of <italic>M. pygmaeus</italic>. Furthermore, the presence of <italic>M. persicae</italic> made aubergine plants more attractive to <italic>M. pygmaeus</italic> nymphs than uninfested aubergine plants. The gas chromatography-mass spectrometry analysis showed that plants infested with <italic>M. persicae</italic> emitted additional compounds as compared to the volatiles emitted from uninfested plants. In particular, four compounds, (<italic>E</italic>)-β-farnesene, (<italic>E,E</italic>)-TMTT, 2-methylbutanal oxime and dodecanal were found present only in the headspace of aubergine plants with aphids. However, <italic>M. pygmaeus</italic> did not show preference for the floral resources. Our results indicate that the response of <italic>M. pygmaeus</italic> is tuned toward the various stimuli in its habitat.</p>