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Depth of Seed Burial and Gender Influence Weed Seed Predation by Three Species of Ground Beetle (Coleoptera: Carabidae)

Published online by Cambridge University Press:  20 January 2017

Sharavari S. Kulkarni ,
Lloyd M. Dosdall ,
John R. Spence  and
Christian J. Willenborg
Sharavari S. Kulkarni
Affiliation:
Department of Agricultural, Food, and Nutritional Science, 410 Ag/Forestry Building, University of Alberta, Edmonton, AB, Canada T6G 2P5
Lloyd M. Dosdall
Affiliation:
Department of Agricultural, Food, and Nutritional Science, 410 Ag/Forestry Building, University of Alberta, Edmonton, AB, Canada T6G 2P5
John R. Spence
Affiliation:
Department of Renewable Resources, 751 General Services Building, University of Alberta, Edmonton, AB, Canada T6G 2H1
Christian J. Willenborg*
Affiliation:
Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK Canada S7N 5A8
*
Corresponding author's E-mail: chris.willenborg@usask.ca
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Abstract

Ground beetles are postdispersal weed seed predators, yet their role in consuming buried seeds is not well studied. We conducted greenhouse experiments to investigate how seed burial affects consumption of weed seeds (volunteer canola) by adult ground beetles (Coleoptera: Carabidae). Seed burial depth influenced seed consumption rates as demonstrated by a significant interaction between seed burial depth, carabid species, and gender of the carabid tested. We observed higher seed consumption by females of all species, and greater consumption of seeds scattered on the soil surface compared with seeds buried at any depth. However, there was evidence of seed consumption at all depths. Adults of Pterostichus melanarius (Illiger) and Harpalus affinis (Schrank) consumed more buried seeds than did those of Amara littoralis Mannerheim. Agricultural practices, such as tillage, bury seeds at different depths and based on the results of this study, these practices may reduce seed consumption by carabids. Soil conservation practices that reduce tillage (conservation or zero tillage) will favor greater weed seed predation due, in part, to the high availability of seeds at the soil surface or at shallow soil depths.

Keywords

Volunteer canola, Brassica napus LCarabid beetlesecological weed managementecosystem servicesgranivoryseedbankseed burial depthweed seed predation
Type
Weed Biology and Ecology
Information
Weed Science , Volume 63 , Issue 4 , December 2015 , pp. 910 - 915
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Adam Davis, USDA-ARS.

References

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