Postdispersal predation of common lambsquarters, Chenopodium album, and barnyardgrass, Echinochloa crus-galli, seed

dc.contributor.advisorSwanton, C.J.
dc.contributor.authorCromar, Heather Eve
dc.date.accessioned2020-08-24T15:53:13Z
dc.date.available2020-08-24T15:53:13Z
dc.date.copyright1998
dc.degree.departmentDepartment of Crop Scienceen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractField experiments were conducted from 1995-1997 to determine the influence of tillage and ground cover on the quantity of postdispersal seed predation of common lambsquarters and barnyardgrass. Ground-dwelling invertebrates were the dominant seed predators, and were responsible for 80-90% of all seeds consumed. Predation was highest in no-till and moldboard plowed environments (averaging 32% in both) and lowest in chisel plowed environments (averaging 24%). In no-till, the type of crop residue also influenced the quantity of predation, with highest seed predation found in plots with corn residue (averaging 31%) and lowest in those with soybean and wheat residue (24 and 21%, respectively). It is apparent that there is an optimum combination of residue quantity and quality that maximizes the quantity of seed predation and that other factors such as the mobility of invertebrates and food availability may also play important roles in determining the quantity of seed predation. Seed predators preferred to consume barnyardgrass seed, and for both species, density dependent feeding was evident.en_US
dc.identifier.urihttps://hdl.handle.net/10214/20491
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectpostdispersal seed predationen_US
dc.subjectcommon lambsquartersen_US
dc.subjectChenopodium albumen_US
dc.subjectbarnyardgrassen_US
dc.subjectEchinochloa crus-gallien_US
dc.subjectseeden_US
dc.titlePostdispersal predation of common lambsquarters, Chenopodium album, and barnyardgrass, Echinochloa crus-galli, seeden_US
dc.typeThesisen_US

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