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A Method for Quantifying Foliage-Dwelling Arthropods

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Bats limit insects in a neotropical agroforestry system.

Kimberly Williams-Guillén¹, Ivette Perfecto, John Vandermeer

¹School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109, USA. kimwg@umich.edu

Science (New York, N.Y.)

|April 5, 2008

Summary

Bird and bat predation significantly impacts arthropod populations in coffee plants. Previous studies may have underestimated bat predation effects due to additive impacts with birds.

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Area of Science:

Ecology
Zoology
Agricultural Science

Background:

Exclosure experiments are common for studying predator effects on arthropods.
Bird predation is a well-documented factor influencing arthropod abundance.
The role of bats as predators in agricultural systems is less understood.

Purpose of the Study:

To quantify the individual and combined effects of bird and bat predation on arthropods in a Mexican coffee plantation.
To assess whether previous exclosure experiments focusing solely on birds might have overlooked significant bat predation impacts.

Main Methods:

Conducted exclosure experiments in a Mexican coffee plantation.
Excluded foliage-gleaning birds and bats from specific coffee plants.
Compared arthropod abundance in control plants versus exclosure plants during dry and wet seasons.

Main Results:

Bird predation reduced arthropods by 30% in the dry season; combined bird and bat exclusion reduced them by 46%.
In the wet season, bats reduced arthropods by 84%, while birds reduced them by 58%.
The effects of bird and bat predation were additive.

Conclusions:

Bat predation can be a major factor in controlling arthropod populations in coffee agroecosystems, particularly during the wet season.
Previous exclosure experiments focusing only on birds may have underestimated total predator impact.
Findings highlight the importance of considering multiple predator groups, including bats, in ecological studies.