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Volatile Sex Pheromone Extraction and Chemoattraction Assay in Caenorhabditis elegans

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Cascading trait-mediated interactions induced by ant pheromones.

Hsun-Yi Hsieh¹, Heidi Liere, Estelí J Soto

¹School of Natural Resources and Environment, University of Michigan Ann Arbor, Michigan, 48109.

Ecology and Evolution

|November 10, 2012

Summary

Parasitic flies indirectly help beetles reproduce by disrupting ant protection of scale insects. This creates a trait-mediated cascade where predator eavesdropping on chemical signals facilitates prey reproduction.

Keywords:

Alarm signaling TMII ant–hemipteran mutualism coffee agroecosystem complex ecological network predator avoidance

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Area of Science:

Ecology
Chemical Ecology
Behavioral Ecology

Background:

Trait-mediated indirect interactions (TMII) are crucial ecological forces, comparable in importance to density-mediated interactions.
Understanding complex indirect interactions, such as cascades where one TMII influences another, is essential for ecological insight.

Purpose of the Study:

To provide evidence for a novel trait-mediated cascade involving predator eavesdropping on chemical signaling.
To elucidate the mechanisms by which parasitic phorid flies indirectly facilitate beetle oviposition through altered ant behavior.

Main Methods:

Observational studies on ant-scale insect-beetle interactions.
Experimental manipulation of phorid fly presence to assess impact on ant foraging and beetle oviposition.
Chemical analysis and behavioral assays to detect and respond to ant alarm pheromones.

Main Results:

Ants protect scale insects from beetle predation (first TMII).
Parasitic phorid flies reduce ant foraging by 50%, enabling beetle oviposition (second TMII).
Female beetles, particularly gravid ones, detect and are attracted to ant pheromones released when ants are attacked by phorids.

Conclusions:

Phorid flies facilitate beetle oviposition by disrupting ant protection through chemical eavesdropping.
This study demonstrates a novel trait-mediated cascade initiated by predator eavesdropping on host chemical cues.
The findings highlight the intricate ways in which indirect interactions shape community dynamics and reproductive success.