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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Intraguild predation and native lady beetle decline.

Mary M Gardiner¹, Matthew E O'Neal, Douglas A Landis

¹Department of Entomology, Michigan State University, East Lansing, Michigan, United States of America. gardiner.29@osu.edu

|September 21, 2011

Summary

Native lady beetle (Coleomegilla maculata) eggs face intense predation in Michigan and Iowa soybean fields. Landscape structure, particularly surrounding semi-natural habitats, significantly influences this egg predation, impacting native coccinellid populations.

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Area of Science:

Ecology
Entomology
Conservation Biology

Background:

North American coccinellid communities show declining native species, potentially due to intraguild predation by invasive exotic species.
Previous research indicates higher exotic coccinellid abundance in Michigan compared to Iowa, with landscape structure influencing coccinellid activity.

Purpose of the Study:

To quantify egg predation on a native coccinellid, Coleomegilla maculata, in Michigan and Iowa soybean fields.
To investigate the influence of local and large-scale landscape structure on intraguild predation rates.

Main Methods:

Utilized sentinel egg masses of the native lady beetle Coleomegilla maculata in soybean fields across Michigan and Iowa.
Assessed egg mass attack and consumption rates within 48 hours.
Characterized local predator communities and quantified landscape structure, including edge habitat composition.

Main Results:

High rates of egg predation were observed, with 60.7% of egg masses attacked and 43.0% of eggs consumed within 48 hours.
Exotic predators (Coccinella septempunctata, Harmonia axyridis) dominated in Michigan, while native species were more prevalent in Iowa.
Egg predation intensity was strongly predicted by the composition of bordering edge habitats, with semi-natural habitats leading to higher predation.

Conclusions:

Intraguild predation by both native and exotic lady beetles contributes to the decline of native coccinellid populations.
Landscape structure, particularly the presence of semi-natural habitats, plays a critical role in mediating predator-prey interactions and native species decline.