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Do Bacterial Symbionts Govern Aphid's Dropping Behavior?

Omer Lavy1, Noa Sher2, Assaf Malik2

  • 1Department of Biology and Environment, University of Haifa, Oranim, Tivon 36006, Israel. omer.lavy@gmail.com.

Environmental Entomology
|August 28, 2015
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Summary
This summary is machine-generated.

Pea aphid (Acyrthosiphon pisum) bacterial symbionts do not influence their defensive dropping behavior. This study investigated the link between symbiont presence and aphid evasion tactics, finding no correlation.

Keywords:
Acyrthosiphon pisumRegiella insecticolaRickettsiaSerattia symbioticadefensive mutualism

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Area of Science:

  • Ecology and evolutionary biology
  • Insect-microbe interactions
  • Behavioral ecology

Background:

  • Defensive symbiosis is crucial for species' evolution and ecology.
  • Pea aphids (Acyrthosiphon pisum) host bacterial symbionts that can offer protection.
  • Aphids exhibit a dropping behavior to evade mammalian herbivores.

Purpose of the Study:

  • To investigate if bacterial symbionts influence the dropping behavior of pea aphids.
  • To compare bacterial communities in dropping versus non-dropping pea aphids.
  • To determine the role of facultative symbionts in aphid anti-predator responses.

Main Methods:

  • Utilized high-throughput 16S rRNA sequencing on the Illumina platform.
  • Employed diagnostic polymerase chain reaction (PCR) for bacterial detection.
  • Analyzed bacterial fauna in dropping and non-dropping pea aphid populations.

Main Results:

  • Obligatory Buchnera aphidicola and facultative symbionts (Serratia symbiotica, Regiella insecticola, Rickettsia) were identified.
  • No significant differences in infection proportions were found between dropping and non-dropping aphids.
  • S. symbiotica was detected by both sequencing and PCR; R. insecticola and Rickettsia were PCR-detectable only.

Conclusions:

  • Pea aphid dropping behavior is not governed by their bacterial symbionts.
  • The study suggests other factors likely influence this defensive behavior.
  • Further research is needed to identify the triggers for aphid dropping behavior.