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Water depth-dependent notonectid predatory impacts across larval mosquito ontogeny
Arpita Dalal1, Ross N Cuthbert2, Jaimie Ta Dick2
1Department of Ecology and Environmental Science, Assam University, Silchar, India.
Pest Management Science
|February 8, 2019
Summary
Predatory insects, Anisops notonectids, show reduced mosquito predation in deeper water. Water depth and prey size significantly impact predator efficiency, with implications for mosquito control strategies.
Area of Science:
- Aquatic Ecology
- Predator-Prey Dynamics
- Vector Control
Background:
- Context-dependencies, such as water depth, influence predatory interactions in aquatic systems.
- Prey size and water depth can affect predator efficiency and create size-refuge effects for prey.
- Notonectid predators' impact on mosquito larvae (Culex quinquefasciatus) across varying water depths remains underquantified.
Purpose of the Study:
- To quantify the predatory impact of Anisops breddini and Anisops sardeus on different larval instars of Culex quinquefasciatus.
- To investigate how water depth influences the functional responses (FRs) of these notonectid predators.
- To understand the role of prey size and water depth in modulating predator-prey interactions.
Main Methods:
- Utilized functional response (FR) experiments to assess predation rates.
- Examined two notonectid species (Anisops breddini, Anisops sardeus) against four larval instars of Culex quinquefasciatus.
- Varied water depth as a key environmental factor in the experimental setup.
Main Results:
- Consumption rates differed significantly between predator species and were influenced by water depth.
- Predation rates were generally higher on early instar mosquito larvae compared to late instars.
- Type II FRs were common, with Type III FRs observed in specific treatments, indicating complex predator-prey dynamics.
- Capture rates and handling times increased with depth, reducing maximum feeding rates.
Conclusions:
- Notonectid predators exert substantial predatory impact on mosquito larvae.
- Water depth and prey size are critical abiotic and biotic factors influencing predator efficacy.
- Promoting notonectids in aquatic systems could be a viable strategy for managing medically important mosquito populations.
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