title: Viability selection prior to trait expression is an essential component of natural selection.
abstract: Natural selection operates throughout the life cycle of an organism. Correlative studies typically fail to consider the effects of viability selection prior to trait expression. A 3-year field experiment on the wildflower Mimulus guttatus demonstrates that this unmeasured component of selection can be very strong. As in previous studies, we find that fecundity is positively related to flower size. However, survival to flowering is much lower in large-flowered genotypes than in small-flowered genotypes. Aggregating viability and fecundity, lifetime fitness through female function generally favoured smaller flowered genotypes. This result differs from the great majority of field studies, which suggest strong positive selection on flower size. It has important cautionary implications for studies of natural and sexual selection on adult characters generally, in both plants and animals.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA.
authors.forename: Julius P
authors.initials: JP
authors.lastname: Mojica
authors.forename: John K
authors.initials: JK
authors.lastname: Kelly
mesh_terms: D005298:Fertility; D035264:Flowers / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology; D005838:Genotype; D032241:Mimulus / Q000033:anatomy & histology / Q000235:genetics* / Q000502:physiology; D010641:Phenotype; D012641:Selection, Genetic
references.citation: Heredity (Edinb). 2003 Apr;90(4):336-42
references.pmid: 12692587
references.citation: Proc Biol Sci. 2008 Mar 22;275(1635):629-38
references.pmid: 18211871
references.citation: New Phytol. 2008;177(3):802-810
references.pmid: 18005321
references.citation: Genetics. 2003 Jul;164(3):1071-85
references.pmid: 12871916
references.citation: Evolution. 1992 Jun;46(3):616-626
references.pmid: 28568666
references.citation: Evolution. 2003 Jul;57(7):1478-88
references.pmid: 12940353
references.citation: J Evol Biol. 2006 Jan;19(1):289-301
references.pmid: 16405599
references.citation: Evolution. 2004 Jul;58(7):1608-12
references.pmid: 15341162
references.citation: Evolution. 1996 Aug;50(4):1501-1511
references.pmid: 28565696
references.citation: Evolution. 2001 May;55(5):937-42
references.pmid: 11430654
references.citation: Evolution. 1987 Nov;41(6):1149-1161
references.pmid: 28563617
references.citation: Genetica. 2008 Feb;132(2):187-98
references.pmid: 17607507
references.citation: Evolution. 1989 May;43(3):563-572
references.pmid: 28568384
references.citation: Science. 1986 Jun 27;232(4758):1625-7
references.pmid: 17812141
references.citation: Evolution. 1996 Oct;50(5):1939-1948
references.pmid: 28565587
references.citation: Q Rev Biol. 2000 Dec;75(4):385-407
references.pmid: 11125698
references.citation: Proc Biol Sci. 2008 Mar 22;275(1635):723-34
references.pmid: 18211873
references.citation: Evolution. 2000 Oct;54(5):1533-45
references.pmid: 11108582
references.citation: Evolution. 2006 Dec;60(12):2466-77
references.pmid: 17263109
references.citation: Am Nat. 2002 Oct;160(4):511-23
references.pmid: 18707526
references.citation: Am Nat. 2001 Mar;157(3):245-61
references.pmid: 18707288
references.citation: New Phytol. 2007;173(2):354-66
references.pmid: 17204082
references.citation: Evolution. 2004 Sep;58(9):1936-46
references.pmid: 15521453
references.citation: Evolution. 1983 Nov;37(6):1210-1226
references.pmid: 28556011
references.citation: Evolution. 1979 Mar;33(1Part2):402-416
references.pmid: 28568194
references.citation: J Evol Biol. 2004 Nov;17(6):1389-99
references.pmid: 15525423
references.citation: Genetics. 2004 Aug;167(4):1529-36
references.pmid: 15342495
references.citation: New Phytol. 2009 Aug;183(3):691-701
references.pmid: 19566813
references.citation: Evolution. 2004 Oct;58(10):2133-43
references.pmid: 15562680
references.citation: Proc Biol Sci. 2004 Feb 22;271(1537):425-34
references.pmid: 15101702
references.citation: Biol Lett. 2008 Apr 23;4(2):200-3
references.pmid: 18285277
references.citation: Evolution. 2009 May;63(5):1292-300
references.pmid: 19154392
references.citation: Evolution. 1990 Dec;44(8):1947-1955
references.pmid: 28564434
references.citation: Evolution. 1995 Apr;49(2):317-324
references.pmid: 28564999
references.citation: Evolution. 1990 Dec;44(8):1956-1966
references.pmid: 28564429