title: Evolution of symbiosis with resource allocation from fecundity to survival.
abstract: Symbiosis is one of the most fundamental relationships between or among organisms and includes parasitism (which has negative effects on the fitness of the interacting partner), commensalism (no effect), and mutualism (positive effects). The effects of these interactions are usually assumed to influence a single component of a species' fitness, either survival or fecundity, even though in reality the interaction can simultaneously affect both of these components. I used a dual lattice model to investigate the process of evolution of mutualistic symbiosis in the presence of interactive effects on both survival and fecundity. I demonstrate that a positive effect on survival and a negative effect on fecundity are key to the establishment of mutualism. Furthermore, both the parasitic and the mutualistic behaviour must carry large costs for mutualism to evolve. This helps develop a new understanding of symbiosis as a function of resource allocation, in which resources are shifted from fecundity to survival. The simultaneous establishment of mutualism from parasitism never occurs in two species, but can do so in one of the species as long as the partner still behaves parasitically. This suggests that one of the altruistic behaviours in a mutualistic unit consisting of two species must originate as a parasitic behaviour.
authors.affiliation: Center for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu, Shiga, 520-2113, Japan, fshin3@gmail.com.
authors.forename: Shin
authors.initials: S
authors.lastname: Fukui
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003198:Computer Simulation; D005298:Fertility / Q000502:physiology; D008954:Models, Biological; D016019:Survival Analysis; D013559:Symbiosis / Q000502:physiology*
references.citation: Annu Rev Entomol. 1998;43:17-37
references.pmid: 15012383
references.citation: Am Nat. 2003 Aug;162(2):195-204
references.pmid: 12858264
references.citation: Proc Biol Sci. 2008 Feb 22;275(1633):353-61
references.pmid: 18055391
references.citation: J Theor Biol. 2009 Aug 21;259(4):744-50
references.pmid: 19409909
references.citation: J Evol Biol. 2010 May;23(5):1075-89
references.pmid: 20345811
references.citation: Ann N Y Acad Sci. 1987;503:295-306
references.pmid: 3304078
references.citation: Am Nat. 2003 Feb;161(2):310-25
references.pmid: 12675375
references.citation: Science. 1972 Jun 9;176(4039):1122-3
references.pmid: 5035468
references.citation: Science. 1981 Mar 27;211(4489):1390-6
references.pmid: 7466396
references.citation: J Theor Biol. 2006 Aug 21;241(4):896-902
references.pmid: 16527312
references.citation: Trends Parasitol. 2009 Feb;25(2):62-6
references.pmid: 19185541
references.citation: PLoS Pathog. 2009 Apr;5(4):e1000368
references.pmid: 19343208
references.citation: Theor Popul Biol. 1999 Jun;55(3):309-23
references.pmid: 10366555
references.citation: Trends Ecol Evol. 2000 Aug;15(8):321-326
references.pmid: 10884696
references.citation: J Theor Biol. 2007 May 7;246(1):10-7
references.pmid: 17261314
references.citation: Proc Natl Acad Sci U S A. 1995 Sep 12;92(19):8985-9
references.pmid: 7568057
references.citation: PLoS One. 2011 Feb 16;6(2):e17105
references.pmid: 21359225
references.citation: Proc Biol Sci. 2003 Dec 22;270(1533):2543-50
references.pmid: 14728775
references.citation: Trends Ecol Evol. 1999 Feb;14(2):49-53
references.pmid: 10234251
references.citation: PLoS Biol. 2008 Dec 23;6(12):e2
references.pmid: 19222304
references.citation: Proc Natl Acad Sci U S A. 2011 Jun 28;108 Suppl 2:10800-7
references.pmid: 21690339
references.citation: Q Rev Biol. 2004 Jun;79(2):135-60
references.pmid: 15232949
references.citation: Proc Biol Sci. 2002 Apr 22;269(1493):773-80
references.pmid: 11958708
references.citation: Proc Natl Acad Sci U S A. 2010 Jan 12;107(2):769-74
references.pmid: 20080750
references.citation: Proc Natl Acad Sci U S A. 1998 Jul 21;95(15):8676-80
references.pmid: 9671737
references.citation: Science. 2008 Oct 31;322(5902):702
references.pmid: 18974344
references.citation: Ecology. 2006 Apr;87(4):892-902
references.pmid: 16676533
references.citation: Oecologia. 2000 Nov;125(3):321-330
references.pmid: 28547326
references.citation: J Theor Biol. 2004 Feb 21;226(4):421-8
references.pmid: 14759648