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Invasive predators affect community-wide pollinator visitation.

Christina T Liang1,2, Aaron B Shiels3, William P Haines4

  • 1Pacific Southwest Research Station, USDA Forest Service, Hilo, Hawai'i, USA.

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|December 17, 2021
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Summary
This summary is machine-generated.

Controlling invasive predators like rats, mice, ants, and wasps significantly boosted pollinator visits to native Hawaiian plants. Predator suppression can reverse pollination disruption, aiding endangered species and imperiled pollinators.

Keywords:
community ecologyinsect pollinatorsinvasion biologyinvasive predatorsinvasive species suppressionplant-animal interactionspollination disruption

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Area of Science:

  • Ecology
  • Conservation Biology
  • Entomology

Background:

  • Invasive predators threaten native ecosystems by disrupting crucial plant-pollinator interactions.
  • Understanding these disruptions is vital for effective conservation strategies, especially for endangered plant species.

Purpose of the Study:

  • To investigate the impact of invasive predator suppression on insect pollinator visitation to native Hawaiian plants.
  • To assess the potential of predator control for mitigating pollination disruption and supporting plant reproduction.

Main Methods:

  • A multiyear field experiment in Hawai'i involved suppressing invasive predators (rats, mice, ants, yellowjacket wasps).
  • Insect visitation rates to six native plant species, including three endangered ones, were monitored.
  • Statistical analyses and modeling were used to determine the effects of predator suppression on plant-pollinator interactions.

Main Results:

  • Suppressing invasive predators positively affected pollinator visitation in 16 out of 19 significant predator-pollinator-plant interactions.
  • Rats and ants showed only positive impacts, while mice and yellowjacket wasps had mixed effects.
  • Predator eradication was predicted to increase insect visitation by over 90% for some species.

Conclusions:

  • Invasive predator suppression, particularly of rodents, ants, and yellowjackets, can effectively reverse pollination disruption.
  • These findings offer a promising approach for conserving native flora and fauna, especially in biodiversity hotspots.
  • Conservation efforts should consider integrated pest management strategies to protect vulnerable plant and pollinator populations.