title: Plant genotypic diversity reduces the rate of consumer resource utilization.
abstract: While plant species diversity can reduce herbivore densities and herbivory, little is known regarding how plant genotypic diversity alters resource utilization by herbivores. Here, we show that an invasive folivore--the Japanese beetle (Popillia japonica)--increases 28 per cent in abundance, but consumes 24 per cent less foliage in genotypic polycultures compared with monocultures of the common evening primrose (Oenothera biennis). We found strong complementarity for reduced herbivore damage among plant genotypes growing in polycultures and a weak dominance effect of particularly resistant genotypes. Sequential feeding by P. japonica on different genotypes from polycultures resulted in reduced consumption compared with feeding on different plants of the same genotype from monocultures. Thus, diet mixing among plant genotypes reduced herbivore consumption efficiency. Despite positive complementarity driving an increase in fruit production in polycultures, we observed a trade-off between complementarity for increased plant productivity and resistance to herbivory, suggesting costs in the complementary use of resources by plant genotypes may manifest across trophic levels. These results elucidate mechanisms for how plant genotypic diversity simultaneously alters resource utilization by both producers and consumers, and show that population genotypic diversity can increase the resistance of a native plant to an invasive herbivore.
authors: Department of Entomology, Cornell University, Ithaca, NY 14853, USA. scott.mcart@gmail.com
authors: Scott H
authors: SH
authors: McArt
authors: Jennifer S
authors: JS
authors: Thaler
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000502:physiology*; D005838:Genotype; D060434:Herbivory; D009518:New York; D031665:Oenothera biennis / Q000235:genetics* / Q000254:growth & development; D011156:Population Density
keywords: Popillia japonica; biodiversity–ecosystem function; community genetics; diet mixing; herbivory; plant–insect interactions
references: Mol Ecol Resour. 2008 Mar;8(2):434-6
references: 21585813
references: Annu Rev Entomol. 2002;47:175-205
references: 11729073
references: Nature. 2001 Jul 5;412(6842):72-6
references: 11452308
references: PLoS One. 2011;6(12):e28055
references: 22174766
references: J Evol Biol. 2007 Jan;20(1):190-200
references: 17210012
references: Ecol Lett. 2010 Feb;13(2):194-201
references: 20050865
references: Ecology. 2011 May;92(5):1157-65
references: 21661576
references: Q Rev Biol. 2006 Dec;81(4):349-76
references: 17240728
references: Ecol Lett. 2009 Oct;12(10):1029-39
references: 19702636
references: Proc Biol Sci. 2011 Oct 22;278(1721):3108-15
references: 21378084
references: Trends Ecol Evol. 2005 Aug;20(8):441-8
references: 16701415
references: Ecol Lett. 2007 Jun;10(6):522-38
references: 17498151
references: Science. 1976 Jul 2;193(4247):24-9
references: 17793989
references: Science. 2006 Aug 18;313(5789):966-8
references: 16917062
references: Monogr Popul Biol. 1982;17:1-296
references: 7162524
references: Proc Natl Acad Sci U S A. 2007 Nov 13;104(46):18123-8
references: 17991772
references: Ecol Lett. 2008 Jun;11(6):609-23
references: 18400018
references: Ecology. 2011 Apr;92(4):915-23
references: 21661554
references: Oecologia. 2012 Apr;168(4):1013-21
references: 22002039
references: Proc Biol Sci. 2007 Mar 22;274(1611):871-6
references: 17251113
references: J Chem Ecol. 2006 Jun;32(6):1247-66
references: 16770716
references: Proc Natl Acad Sci U S A. 2005 Feb 22;102(8):2826-31
references: 15710890
references: Ecol Lett. 2007 Jun;10(6):499-511
references: 17498149
references: Ecol Lett. 2007 Sep;10(9):835-48
references: 17663717
references: Proc Natl Acad Sci U S A. 2012 Jul 31;109(31):12616-20
references: 22802664
references: Ecol Lett. 2010 May;13(5):553-63
references: 20298460
references: Proc Natl Acad Sci U S A. 2005 Jan 18;102(3):695-700
references: 15640357
references: J Evol Biol. 2009 Jun;22(6):1295-307
references: 19490388
references: Proc Natl Acad Sci U S A. 2004 Jun 15;101(24):8998-9002
references: 15184681