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Mosquito consumption by insectivorous bats: does size matter?

Leroy Gonsalves¹, Brian Bicknell, Brad Law

¹School of Arts & Sciences, Australian Catholic University, North Sydney, New South Wales, Australia.

|October 17, 2013

Summary

Area of Science:

Ecology
Zoology
Conservation Biology

Background:

Insectivorous bats are considered natural mosquito predators.
Mosquitoes typically form a minor part of bat diets due to size and echolocation constraints.
Bat size influences echolocation frequency and metabolic rate, potentially affecting prey selection.

Purpose of the Study:

To investigate how bat size impacts mosquito consumption.
To assess the role of different bat species in mosquito control.
To understand prey selection in relation to prey abundance and energetic profitability.

Main Methods:

Molecular analysis of fecal DNA from five eastern Australian bat species.
Dietary analysis correlated with bat size (4-14g) and echolocation frequency.

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Concurrent measurement of local mosquito and non-mosquito prey abundance.

Main Results:

Mosquito consumption was limited to two smaller bat species: Vespadelus vulturnus (4g) and V. pumilus (4.5g).
Lepidoptera dominated bat diets, reflecting local insect abundance.
Larger bats did not consume mosquitoes, likely due to lower energetic profitability compared to other insect prey.

Conclusions:

Bat size is a key factor determining mosquito predation.
Smaller bat species, particularly V. vulturnus, are more likely to consume mosquitoes.
Mosquito control programs should consider monitoring smaller bat populations sensitive to mosquito abundance changes.