Resolving conflicts during the evolutionary transition to multicellular life

Annual Review of Ecology, Evolution, and Systematics

Volumn 45, Issue , 2014, Pages 599-620

  Rainey, Paul B ^a,b   De Monte, Silvia ^c  

^a MASSEY UNIVERSITY   (New Zealand)

^b MAX PLANCK INSTITUTE FOR EVOLUTIONARY BIOLOGY   (Germany)

^c ECOLE NORMALE SUPÉRIEURE   (France)

Author keywords

cooperation; Darwinian individuality; levels of selection; life cycles

Indexed keywords

EVOLUTIONARY BIOLOGY; HIERARCHICAL SYSTEM; TEMPORAL ANALYSIS; THEORETICAL STUDY;

EID: 84913601238     PISSN: 1543592X     EISSN: 15452069     Source Type: Book Series    
DOI: 10.1146/annurev-ecolsys-120213-091740     Document Type: Article

References (170)

1. Allen B,Nowak MA,Wilson EO. 2013. Limitations of inclusive fitness. Proc. Natl. Acad. Sci. USA 110:20135-39
2. Aravind L, Anantharaman V, Zhang DP, de Souza RF, Iyer LM. 2012. Gene flow and biological conflict systems in the origin and evolution of eukaryotes. Front. Cell Infect. Microbiol. 2:89
3. Aviles L. 2002. Solving the freeloaders paradox: genetic associations and frequency-dependent selection in the evolution of cooperation among nonrelatives. Proc. Natl. Acad. Sci. USA 99:14268-73
4. Axelrod R, Hamilton WD. 1981. The evolution of cooperation. Science 211:1390-96
5. Bantinaki E, Kassen R, Knight C, Robinson Z, Spiers AJ, Rainey PB. 2007. Adaptive divergence in experimental populations of Pseudomonas fluorescens. III. Mutational origins of wrinkly spreader diversity. Genetics 176:441-53
6. Bonner JT. 1974. On Development: The Biology of Form. Cambridge, MA: Harvard Univ. Press
7. Bonner JT. 1982. Evolution and Development. Berlin: Springer
8. Bonner JT. 1998. The origins of multicellularity. Integr. Biol. 1:27-36
9. Bonner JT. 2000. First Signals: The Evolution of Multicellular Development. Princeton, NJ: Princeton Univ. Press
10. Boraas ME, Seale DB, Boxhorn JE. 1998. Phagotrophy by a flagellate selects for colonial prey: a possible origin of multicellularity. Evol. Ecol. 12:153-64
11. Bowles S, Choi JK, Hopfensitz A. 2003. The co-evolution of individual behaviors and social institutions. J. Theor. Biol. 223:135-47
12. Brenner K, You LC, Arnold FH. 2008. Engineering microbial consortia: a new frontier in synthetic biology. Trends Biotechnol. 26:483-89
13. Buss LW. 1987. The Evolution of Individuality. Princeton, NJ: Princeton Univ. Press
14. Carroll SB. 2001. Chance and necessity: the evolution of morphological complexity and diversity. Nature 409:1102-9
15. Chao L, Levin BR. 1981. Structured habitats and the evolution of anticompetitor toxins in bacteria. Proc. Natl. Acad. Sci. USA 78:6324-28
16. Charlesworth B. 1980. Models of kin selection. In Evolution of Social Behaviour, ed. H Markl, pp. 11-26. Weinheim: Verlag
17. Chemie Clarke E. 2010. The problem of biological individuality. Biol. Theory 5:312-25
18. Clarke E. 2014. Origins of evolutionary transitions. J. Biosci. 39:1-14
19. Conway Morris S. 1998. The Crucible of Creation. Oxford, UK: Oxford Univ. Press
20. Damuth J, Heisler IL. 1988. Alternative formulations of multi-level selection. Biol. Philos. 3:407-30
21. Dawkins R. 1976. The Selfish Gene. Oxford, UK: Oxford Univ. Press
22. Dawkins R. 1982. The Extended Phenotype. Oxford, UK: Oxford Univ. Press
23. De Monte S, Rainey PB. 2014. Nascent multicellular life and the emergence of individuality. J. Biosci. 39(2):237-48
24. de Vienne DM, Giraud T, Gouyon PH. 2013. Lineage selection and the maintenance of sex. PLOS ONE 8:e66906
25. Dennett DC. 1995. Darwin's Dangerous Idea: Evolution and the Meanings of Life. London: Penguin
26. Doebeli M. 2010. Inclusive fitness is just bookkeeping. Nature 467:661
27. Dugatkin LA. 2002. Cooperation in animals: an evolutionary overview. Biol. Philos. 17:459-76
28. Ennis HL, Dao DN, Pukatzki SU, Kessin RH. 2000. Dictyostelium amoebae lacking an F-box protein form spores rather than stalk in chimeras with wild type. Proc. Natl. Acad. Sci. USA 97:3292-97
29. Eraso JM, Chidambaram M, Weinstock GM. 1996. Increased production of colicin E1 in stationary phase. J. Bacteriol. 178:1928-35
30. xtavour CGM. 2007. Evolution of the bilaterian germ line: lineage origin and modulation of specification mechanisms. Integr. Comp. Biol. 47:770-85
31. Fisher RM, Cornwallis CK, West SA. 2013. Group formation, relatedness, and the evolution of multicellularity. Curr. Biol. 23:1120-25
32. Fletcher JA, Doebeli M. 2009. A simple and general explanation for the evolution of altruism. Proc. R. Soc. B 276:13-19
33. Foster KR, Shaulsky G, Strassmann JE, Queller DC, Thompson CRL. 2004. Pleiotropy as a mechanism to stabilize cooperation. Nature 431:693-96
34. Frank S. 1998. Foundations of Social Evolution. Princeton, NJ: Princeton Univ. Press
35. Frank SA. 1995. Mutual policing and repression of competition in the evolution of cooperative groups. Nature 377:520-22
36. Frank SA. 2007. Dynamics of Cancer: Incidence, Inheritance and Evolution. Princeton, NJ: Princeton Univ. Press
37. Frénoy A, Taddei F, Misevic D. 2013. Genetic architecture promotes the evolution and maintenance of cooperation. PLOS Comput. Biol. 9(11):e1003339
38. Friedl P, Gilmour D. 2009. Collective cell migration in morphogenesis, regeneration and cancer. Nat. Rev. Mol. Cell Biol. 10:445-57
39. Garcia T, De Monte S. 2013. Group formation and the evolution of sociality. Evolution 67:131-41
40. Garcia T, Brunnet LG, De Monte S. 2014. Differential adhesion between moving particles as a mechanism for the evolution of social groups. PLOS Comput. Biol. 10(2):e1003482
41. Gardner A, Grafen A. 2009. Capturing the superorganism: a formal theory of group adaptation. J. Evol. Biol. 22:659-71
42. Gardner A,West SA. 2010. Greenbeards. Evolution 64:25-38
43. Gardner A,West SA, Wild G. 2011. The genetical theory of kin selection. J. Evol. Biol. 24:1020-43
44. Gavrilets S. 2010. Rapid transition towards the division of labor via evolution of developmental plasticity. PLOS Comput. Biol. 6:e1000805
45. Godfrey-Smith P. 2009. Darwinian Populations and Natural Selection. Oxford, UK: Oxford Univ. Press
46. Goldsby HJ, Dornhaus A, Kerr B, Ofria C. 2012. Task-switching costs promote the evolution of division of labor and shifts in individuality. Proc. Natl. Acad. Sci. USA 109:13686-91
47. Goodnight CJ. 2005. Multilevel selection: the evolution of cooperation in non-kin groups. Popul. Ecol. 47:3-12
48. Goodnight CJ, Stevens L. 1997. Experimental studies of group selection: What do they tell us about group selection in nature Am. Nat. 150:S59-79
49. Gore J, Youk H, Van Oudenaarden A. 2009. Snowdrift game dynamics and facultative cheating in yeast. Nature 459:253-56
50. Griesemer J. 2000. The units of evolutionary transition. Selection 1:67-80
51. Griffin AS,West SA, BucklingA. 2004. Cooperation and competition in pathogenic bacteria. Nature 430:1024-27
52. Grosberg RK, Strathmann RR. 2007. The evolution of multicellularity: a minor major transition Annu. Rev. Ecol. Evol. Syst. 38:621-54
53. Guttal V, Couzin ID. 2010. Social interactions, information use, and the evolution of collective migration. Proc. Natl. Acad. Sci. USA 107:16172-77
54. Hamilton WD. 1964a. The genetical evolution of social behaviour. 1. J. Theor. Biol. 7:1-16
55. Hamilton WD. 1964b. The genetical evolution of social behaviour. 2. J. Theor. Biol. 7:17-52
56. Hammerschmidt K, Rose C, Kerr B, Rainey PB. 2014. Life cycles, fitness decoupling and the evolution of multicellularity. Nature. In press. doi: 10.1038/nature13884
57. Hammerstein P, ed. 2003 Genetic and Cultural Evolution of Cooperation. Cambridge, MA: MIT Press
58. Hardin G. 1968. The tragedy of the commons. Science 162:1243-48
59. Hauert C, De Monte S,Hofbauer J, Sigmund K. 2002. Volunteering asRed Queen mechanism for cooperation in public goods games. Science 296:1129-32
60. Heisler IL, Damuth J. 1987. A method for analyzing selection in hierarchically structured populations. Am. Nat. 130:582-602
61. Herron MD, Hackett JD, Aylward FO, Michod RE. 2009. Triassic origin and early radiation of multicellular volvocine algae. Proc. Natl. Acad. Sci. USA 106:3254-58
62. Herron MD, Michod RE. 2008. Evolution of complexity in the volvocine algae: transitions in individuality through Darwin's eye. Evolution 62:436-51
63. Herron MD, Rashidi A, Shelton DE, Driscoll WW. 2013. Cellular differentiation and individuality in the 'minor' multicellular taxa. Biol. Rev. 88:844-61
64. Hochberg ME, Rankin DJ, TaborskyM. 2008. The coevolution of cooperation and dispersal in social groups and its implications for the emergence of multicellularity. BMC Evol. Biol. 8:238
65. Hofbauer J, Sigmund K. 2003. Evolutionary game dynamics. Bull. Am. Math. Soc. 40:479-519
66. Honigberg SM. 2011. Cell signals, cell contacts, and the organization of yeast communities. Eukaryot. Cell 10:466-73
67. Hurst LD. 1994. Cytoplasmic genetics under inbreeding and outbreeding. Proc. R. Soc. B 258:287-98
68. Hurst LD, Atlan A, Bengtsson BO. 1996. Genetic conflicts. Q. Rev. Biol. 71:317-64
69. Jablonka E, Lamb MJ. 2006. The evolution of information in the major transitions. J. Theor. Biol. 239:236-46
70. Jansen VA, van Baalen M. 2006. Altruism through beard chromodynamics. Nature 440:663-66
71. Jiang Y, Levine H, Glazier J. 1998. Possible cooperation of differential adhesion and chemotaxis in mound formation of Dictyostelium. Biophys. J. 75:2615-25
72. Johnson AD, Richardson E, Bachvarova RF, Crother BI. 2011. Evolution of the germ line-soma relationship in vertebrate embryos. Reproduction 141:291-300
73. Kerr B, Neuhauser C, Bohannan BJ, Dean AM. 2006. Local migration promotes competitive restraint in a host-pathogen 'tragedy of the commons.' Nature 442:75-78
74. Kerr B, Riley MA, Feldman MW, Bohannan BJM. 2002. Local dispersal promotes biodiversity in a real-life game of rock-paper-scissors. Nature 418:171-74
75. Kerszberg M, Wolpert L. 1998. The origin of metazoa and the egg: a role for cell death. J. Theor. Biol. 193:535-37
76. Khare A, Santorelli LA, Strassmann JE, Queller DC, Kuspa A, Shaulsky G. 2009. Cheater-resistance is not futile. Nature 461:980-82
77. Knoll AH. 2011. The multiple origins of complex multicellularity. Annu. Rev. Earth Planet. Sci. 39:217-39
78. Knoll AH, Javaux EJ, Hewitt D, Cohen P. 2006. Eukaryotic organisms in Proterozoic oceans. Philos. Trans. R. Soc. Lond. B 361:1023-38
79. Koschwanez JH, Foster KR, Murray AW. 2013. Improved use of a public good selects for the evolution of undifferentiated multicellularity. eLife 2:e00367
80. Leigh EG. 1973. The evolution of mutation rates. Genetics 73(Suppl.):1-18
81. Lewontin RC. 1970. The units of selection. Annu. Rev. Ecol. Syst. 1:1-18
82. Libby E, Rainey PB. 2013. A conceptual framework for the evolutionary origins of multicellularity. Phys. Biol. 10:035001
83. Lieberman E, Hauert C, Nowak MA. 2005. Evolutionary dynamics on graphs. Nature 433:312-16
84. Magliani W, Conti S, Gerloni M, Bertolotti D, Polonelli L. 1997. Yeast killer systems. Clin. Microbiol. Rev. 10:369-400
85. Martin W, Muller M. 1998. The hydrogen hypothesis for the first eukaryote. Nature 392:37-41
86. Maynard Smith J. 1964. Group selection and kin selection. Nature 201:1145-46
87. Maynard Smith J. 1976. Group selection. Q. Rev. Biol. 61:277-83
88. Maynard Smith J. 1978. The evolution of behavior. Sci. Am. 239:136-45
89. Maynard Smith J. 1988. Evolutionary progress and the levels of selection. In Evolutionary Progress, ed.MH Nitecki, pp. 219-30. Chicago, IL: Univ. Chicago Press
90. Maynard Smith J, Száthmary E. 1995. The Major Transitions in Evolution. Oxford, UK: Freeman
91. McDonald MJ, Gehrig SM, Meintjes PL, Zhang XX, Rainey PB. 2009. Adaptive divergence in experimental populations of Pseudomonas fluorescens. IV. Genetic constraints guide evolutionary trajectories in a parallel adaptive radiation. Genetics 183:1041-53
92. Mehdiabadi NJ, Jack CN, Farnham TT, Platt TG, Kalla SE, et al. 2006. Kin preference in a social microbe. Nature 442:881-82
93. Michod RE. 1996. Cooperation and conflict in the evolution of individuality. 2. Conflict mediation. Proc. R. Soc. B 263:813-22
94. Michod RE. 1999. Darwinian Dynamics: Evolutionary Transitions in Fitness and Individuality. Princeton, NJ: Princeton Univ. Press
95. Michod RE. 2003. Cooperation and conflict mediation during the origin of multicellularity. SeeHammerstein 2003, pp. 291-307
96. Michod RE. 2006a. The group covariance effect and fitness trade-offs during evolutionary transitions in individuality. Proc. Natl. Acad. Sci. USA 103:9113-17
97. Michod RE. 2006b.On the transfer of fitness from the cell to themulticellular organism. Biol. Philos. 20:967-87
98. Michod RE, Herron MD. 2006. Cooperation and conflict during evolutionary transitions in individuality. J. Evol. Biol. 19:1406-9; discussion 26-36
99. Michod RE, Roze D. 1997. Transitions in individuality. Proc. R. Soc. B 264:853-57
100. Michod RE, Roze D. 1999. Cooperation and conflict in the evolution of individuality III. Transitions in the unit of fitness. In Mathematical and Computational Biology: Computational Morphogenesis, Hierarchical Complexity, and Digital Evolution, ed. CL Nehaniv, pp. 47-92. Providence, RI: Am. Math. Soc.
101. Michod RE, Roze D. 2001. Cooperation and conflict in the evolution of multicellularity. Heredity 81:1-7
102. Newman SA. 2012. Physico-genetic determinants in the evolution of development. Science 338:217-19
103. Newman SA, Bhat R. 2008. Dynamical patterning modules: physico-genetic determinants of morphological development and evolution. Phys. Biol. 5:015008
104. Niklas KJ. 2014. The evolutionary-developmental origins of multicellularity. Am. J. Bot. 101:6-25
105. Niklas KJ, Newman SA. 2013. The origins of multicellular organisms. Evol. Dev. 15:41-52
106. Nowak MA. 2006. Five rules for the evolution of cooperation. Science 314:1560-63
107. Nowak MA, May RM. 1992. Evolutionary games and spatial chaos. Nature 359:826-29
108. NowakMA, OhtsukiH. 2008. Prevolutionary dynamics and the origin of evolution. Proc. Natl. Acad. Sci. USA 105:14924-27
109. Nowak MA, Tarnita CE, Wilson EO. 2010. The evolution of eusociality. Nature 466:1057-62
110. Nunney L. 1999a. Lineage selection and the evolution of multistage carcinogenesis. Proc. R. Soc. B 266:493-98
111. Nunney L. 1999b. Lineage selection: natural selection for long-term benefit. In Levels of Selection in Evolution, ed. L Keller, pp. 238-52. Princeton, NJ: Princeton Univ. Press
112. Nunney L. 2013. The real war on cancer: the evolutionary dynamics of cancer suppression. Evol. Appl. 6:11-19
113. Okasha S. 2006. Evolution and the Levels of Selection. Oxford, UK: Oxford Univ. Press
114. Olson M. 1965. The Logic of Collective Action: Public Goods and the Theory of Groups. Cambridge, MA: Harvard Univ. Press
115. Ostrowski EA, Katoh M, Shaulsky G, Queller DC, Strassmann JE. 2008. Kin discrimination increases with genetic distance in a social amoeba. PLOS Biol. 6:2376-82
116. Oud B, Guadalupe-Medina V, Nijkamp JF, de Ridder D, Pronk JT, et al. 2013. Genome duplication and mutations in ACE2 cause multicellular, fast-sedimenting phenotypes in evolved Saccharomyces cerevisiae. Proc. Natl. Acad. Sci. USA 110:E4223-31. doi: 10.1073/pnas.1305949110
117. Pande S,Merker H, Bohl K, ReicheltM, Schuster S, et al. 2013. Fitness and stability of obligate cross-feeding interactions that emerge upon gene loss in bacteria. ISME J. 8:953-62
118. Pepper JW, Herron MD. 2008. Does biology need an organism concept Biol. Rev. 83:621-27
119. Pfeiffer T, Bonhoeffer S. 2002. Evolutionary consequences of tradeoffs between yield and rate of ATP production. Z. Phys. Chem. 216:51-63
120. Pfeiffer T, Bonhoeffer S. 2003. An evolutionary scenario for the transition to undifferentiated multicellularity. Proc. Natl. Acad. Sci. USA 100:1095-98
121. Pfeiffer T, Schuster S, Bonhoeffer S. 2001. Cooperation and competition in the evolution of ATP-producing pathways. Science 292:504-7
122. Price GR. 1970. Selection and covariance. Nature 227:520-21
123. Price GR. 1972. Extension of covariance selection mathematics. Genetics 35:485-90
124. Price GR. 1995. The nature of selection. J. Theor. Biol. 175:389-96
125. Queller DC. 2000. Relatedness and the fraternal major transitions. Philos. Trans. R. Soc. Lond. B 355:1647-55
126. Queller DC, Ponte E, Bozzaro S, Strassmann JE. 2003. Single-gene greenbeard effects in the social amoeba Dictyostelium discoideum. Science 299:105-6
127. Queller DC, Strassmann JE. 2009. Beyond society: the evolution of organismality. Philos. Trans. R. Soc. Lond. B 364:3143-55
128. Rainey PB. 2007. Unity from conflict. Nature 446:616
129. Rainey PB, Kerr B. 2010. Cheats as first propagules: a new hypothesis for the evolution of individuality during the transition from single cells to multicellularity. BioEssays 32:872-80
130. Rainey PB, Kerr B. 2011. Conflicts among levels of selection as fuel for the evolution of individuality. In The Major Transitions in Evolution Revisited (Vienna Series in Theoretical Biology), ed. B Calcott, K Sterelny, pp. 141-62. London: MIT Press
131. Rainey PB, Rainey K. 2003. Evolution of cooperation and conflict in experimental bacterial populations. Nature 425:72-74
132. Rainey PB, Travisano M. 1998. Adaptive radiation in a heterogeneous environment. Nature 394:69-72
133. Rankin DJ, Bargum K, Kokko H. 2007. The tragedy of the commons in evolutionary biology. Trends Ecol. Evol. 22:643-51
134. Ratcliff WC, Denison RF, Borrello M, Travisano M. 2012. Experimental evolution of multicellularity. Proc. Natl. Acad. Sci. USA 109:1595-600
135. RatcliffWC, Herron MD, Howell K, Pentz JT, Rosenzweig F, Travisano M. 2013a. Experimental evolution of an alternating uni-and multicellular life cycle in Chlamydomonas reinhardtii. Nat. Commun. 4:2742
136. RatcliffWC, Pentz JT, Travisano M. 2013b. Tempo and mode of multicellular adaptation in experimentally evolved Saccharomyces cerevisiae. Evolution 67:1573-81
137. Ratnieks FLW, Visscher PK. 1989. Worker policing in the honeybee. Nature 342:796-97
138. RileyMA, Wertz JE. 2002. Bacteriocins: evolution, ecology, and application. Annu. Rev. Microbiol. 56:117-37
139. Rokas A. 2008. The origins of multicellularity and the early history of the genetic toolkit for animal development. Annu. Rev. Genet. 42:235-51
140. Sachs JL, Mueller UG, Wilcox TP, Bull JJ. 2004. The evolution of cooperation. Q. Rev. Biol. 79:135-60
141. Salles B, Weisemann JM, Weinstock GM. 1987. Temporal control of colicin-E1 induction. J. Bacteriol. 169:5028-34
142. Santorelli LA, Thompson CR, Villegas E, Svetz J, Dinh C, et al. 2008. Facultative cheater mutants reveal the genetic complexity of cooperation in social amoebae. Nature 451:1107-10
143. Santos FC, Santos MD, Pacheco JM. 2008. Social diversity promotes the emergence of cooperation in public goods games. Nature 454:213-16
144. Sebe-Pedros A, Irimia M, del Campo J, Parra-Acero H, Russ C, et al. 2013. Regulated aggregative multicellularity in a close unicellular relative of metazoa. eLife 2:e01287
145. ShouWY, Ram S, Vilar JMG. 2007. Synthetic cooperation in engineered yeast populations. Proc. Natl. Acad. Sci. USA 104:1877-82
146. Simon B, Fletcher JA, Doebeli M. 2012. Towards a general theory of group selection. Evolution 67:1561-72
147. Simpson C. 2012. The evolutionary history of division of labour. Proc. R. Soc. B 279:116-21
148. Smukalla S, CaldaraM, Pochet N, Beauvais A, Guadagnini S, et al. 2008. FLO1 is a variable green beard gene that drives biofilm-like cooperation in budding yeast. Cell 135:726-37
149. Sober E, Wilson DS. 1998. Unto Others: The Evolution and Psychology of Unselfish Behaviour. Cambridge, MA: Harvard Univ. Press
150. Sole RV, Valverde S. 2013. Before the endless forms: embodied model of transition from single cells to aggregates to ecosystem engineering. PLOS ONE 8:e59664
151. Spiers AJ, Kahn SG, Bohannon J, Travisano M, Rainey PB. 2002. Adaptive divergence in experimental populations of Pseudomonas fluorescens. I. Genetic and phenotypic bases of wrinkly spreader fitness. Genetics 161:33-46
152. Száthmary E,Wolpert L. 2003. The evolution of multicellularity. See Hammerstein 2003, pp. 271-90
153. Tarnita CE, Antal T, Ohtsuki H, Nowak MA. 2009. Evolutionary dynamics in set structured populations. Proc. Natl. Acad. Sci. USA 106:8601-4
154. Tarnita CE, Taubes CH, Nowak MA. 2012. Evolutionary construction by staying together and coming together. J. Theor. Biol. 320:10-22
155. Tomitani A, Knoll AH, Cavanaugh CM, Ohno T. 2006. The evolutionary diversification of cyanobacteria: molecular-phylogenetic and paleontological perspectives. Proc. Natl. Acad. Sci. USA 103:5442-47
156. Traulsen A, Nowak MA. 2006. Evolution of cooperation by multilevel selection. Proc. Natl. Acad. Sci. USA 103:10952-55
157. Trivers RL. 1971. The evolution of reciprocal altruism. Q. Rev. Biol. 46:35-57
158. Umen JG, Olson BJSC. 2012. Genomics of volvocine algae. Adv. Bot. Res. 64:185-243
159. van Baalen M, Rand DA. 1998. The unit of selection in viscous populations and the evolution of altruism. J. Theor. Biol. 193:631-48
160. van Veelen M, Garcia J, Aviles L. 2010. It takes grouping and cooperation to get sociality. J. Theor. Biol. 264:1240-53
161. Velicer GJ, Kroos L, Lenski RE. 1998. Loss of social behaviours by Myxococcus xanthus during evolution in an unstructured habitat. Proc. Natl. Acad. Sci. USA 95:12376-80
162. Wade MJ. 1978. A critical review of the models of group selection. Q. Rev. Biol. 53:101-14
163. West SA, Pen I, Griffin AS. 2002. Cooperation and competition between relatives. Science 296:72-75
164. Williams GC. 1966. Adaptation and Natural Selection. Princeton, NJ: Princeton Univ. Press
165. Wilson DS. 1975. A theory of group selection. Proc. Natl. Acad Sci. USA 72:143-46
166. Wilson DS, Dugatkin LA. 1997. Group selection and assortative interactions. Am. Nat. 149:336-51
167. Wilson DS, Pollock GB, Dugatkin LA. 1992. Can altruism evolve in purely viscous populations Evol. Ecol. 6:331-41
168. Wilson DS, Sober E. 1989. Reviving the superorganism. J. Theor. Biol. 136:337-56
169. Wolpert L, Száthmary E. 2002. Multicellularity: evolution and the egg. Nature 420:745
170. Wray GA. 2001. Dating branches on the tree of life using DNA. Genome Biol. 3:1-7