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Fish microbiota repel ovipositing mosquitoes.

Nimrod Shteindel1, Yoram Gerchman1,2, Alon Silberbush1,2

  • 1Faculty of Natural Sciences, University of Haifa, Haifa, Israel.

The Journal of Animal Ecology
|February 29, 2024
PubMed
Summary
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Mosquitoes avoid fish with specific bacteria. Altering fish skin bacteria, like Pantoea pleuroti, reduces their repellent effect on mosquito egg-laying, suggesting a new eco-friendly mosquito control method.

Area of Science:

  • Ecology
  • Microbiology
  • Chemical Ecology

Background:

  • Predator presence triggers prey avoidance behaviors, often via chemical cues.
  • Larvivorous fish release signals that repel gravid female mosquitoes, but the source is unclear.
  • The role of predator microbiota in releasing these chemical signals is poorly understood.

Purpose of the Study:

  • To investigate the impact of Gambusia affinis microbiota on mosquito oviposition behavior.
  • To identify specific bacterial contributions to fish-induced mosquito repellency.

Main Methods:

  • Outdoor mesocosm experiments using fish with manipulated microbiota.
  • Testing bacterial isolates from fish skin for repellent properties.
  • Observing oviposition choices of Culex laticinctus and Culiseta longiareolata.
Keywords:
fish‐released kairomoneshabitat selectionmicrobiotaoviposition

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Main Results:

  • Altering the microbiota of Gambusia affinis significantly reduced its repellent effect on mosquitoes.
  • The bacterium Pantoea pleuroti, isolated from fish skin, effectively repelled mosquito oviposition.
  • This bacterial repellency was comparable to that of live fish.

Conclusions:

  • Bacteria play a crucial role in mediating interspecies interactions between fish predators and mosquito prey.
  • Pantoea pleuroti is identified as a key agent in fish-induced mosquito repellency.
  • Findings suggest potential for developing novel, eco-friendly mosquito repellents based on bacterial cues.