Weighing abiotic and biotic influences on weed seed predation

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Authors: A S. Davis and S. Raghu
Date: Oct. 2010
From: Weed Research(Vol. 50, Issue 5)
Publisher: Wiley Subscription Services, Inc.
Document Type: Report
Length: 296 words

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To authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1365-3180.2010.00790.x Byline: A S DAVIS (*), S RAGHU ([dagger][double dagger]) Keywords: granivory; seedbank dynamics; weather; ecological weed management; Gryllus pennsylvanicus; Carabidae; Araneae; Abutilon theophrasti; Setaria faberi; Ambrosia trifida Abstract: D avis AS & R aghu S (2010). Weighing abiotic and biotic influences on weed seed predation. Weed Research50,402-412. Summary Weed seed predation is an important ecosystem service supporting weed management in low-external-input agroecosystems. Current knowledge of weed seed predation focuses on biotic mechanisms, with less undersatanding of the relative impact of abiotic variables. In order to quantify relative contributions of abiotic and biotic variables to weed seed predation rates, a field study was made within a maize crop in central Illinois, USA, in 2005 and 2006. From late July through to mid-October, weekly measurements of Abutilon theophrasti, Ambrosia trifida and Setaria faberi seed removal rates by invertebrate and vertebrate granivores, and seed losses because of abiotic processes were recorded. Weed seed rain was measured concurrently in contiguous plots, as were air temperature, precipitation, wind speed, thermal units and invertebrate activity-density. Statistical models supported the possibility that higher-level trophic interactions were contributing to variation in seed predation rates. Approaching granivory in agroecosystems as a food web may help future attempts to regulate this ecosystem service. Author Affiliation: (*)Invasive Weed Management Unit, Agricultural Research Service, United States Department of Agriculture, Urbana, IL, USA ([dagger])Illinois Natural History Survey, Champaign, IL, USA ([double dagger])Arid Zone Research Institute, Alice Springs, NT, Australia Article History: Received 19 January 2010 Revised version accepted 12 April 2010 Article note: Adam S Davis, USDA-ARS Global Change and Photosynthesis Research Unit, N-319 Turner Hall, 1102 S. Goodwin Ave., Urbana, IL 61801, USA. Tel: (+01) 217 333 9654; Fax: (+01) 217 333 5251; E-mail: asdavis1@illinois.edu

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Gale Document Number: GALE|A236294900