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Research article - Peer-reviewed, 2021

Multi-scale mosaics in top-down pest control by ants from natural coffee forests to plantations

Stuber, Moritz; Tack, Ayco J. M.; Zewdie, Beyene; Mendesil, Esayas; Shimales, Tamiru; Ayalew, Biruk; Nemomissa, Sileshi; Sjogren, Jorgen; Vesterinen, Eero; Wezel, Alexander; Hylander, Kristoffer;

Abstract

While top-down control plays an important role in shaping both natural and agricultural food webs, we lack insights into how top-down control effects vary across spatial scales. We used a multi-scale survey of top-down control of coffee pests and diseases by arboreal ants to examine if colony location creates a small-scale mosaic in top-down control around trees and if the strength of that control varies between sites at the landscape scale. We investigated pest and disease levels on coffee shrubs at different distances from shade trees with and without a Crematogaster spp. ant colony in 59 sites along a coffee management intensity gradient in southwestern Ethiopia. Within sites, ants significantly suppressed herbivory and coffee leaf rust at distances less than 10 m from nesting trees. Top-down control varied between sites, with stronger top-down control of free-feeding herbivory near ant colonies at sites with lower management intensity and stronger top-down control of a skeletonizer at sites with higher canopy cover. We conclude that the strength of top-down control by ants is highly heterogeneous across spatial scales, as a consequence of the biology of the predator at the small scale and herbivore density or changes in herbivore-ant interactions at the landscape scale.

Keywords

ants; biological pest control; Coffea arabica; coffee leaf rust; Crematogaster sp; Ethiopia; herbivory; Leucoplema dohertyi; Leucoptera sp; scale-dependence

Published in

Ecology

2021, volume: 102, number: 7, article number: e03376
Publisher: WILEY

Authors' information

Stuber, Moritz
Stockholm University
Tack, Ayco J. M.
Stockholm University
Zewdie, Beyene
Stockholm University
Mendesil, Esayas
Jimma University
Shimales, Tamiru
Jimma Agricultural Research Center
Ayalew, Biruk
Stockholm University
Nemomissa, Sileshi
Addis Ababa University
Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies
Sjogren, Jorgen
Stockholm University
Vesterinen, Eero
Swedish University of Agricultural Sciences, Department of Ecology
Vesterinen, Eero
University of Turku
Wezel, Alexander
ISARA
Hylander, Kristoffer
Stockholm University

UKÄ Subject classification

Ecology

Publication Identifiers

DOI: https://doi.org/10.1002/ecy.3376

URI (permanent link to this page)

https://res.slu.se/id/publ/112206