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<meta content="Uller, Tobias" name="eprints.creators_name" />
<meta content="Pen, Ido" name="eprints.creators_name" />
<meta content="Wapstra, Erik" name="eprints.creators_name" />
<meta content="Beukeboom, Leo W." name="eprints.creators_name" />
<meta content="Komdeur, Jan" name="eprints.creators_name" />
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<meta content="Erik.Wapstra@utas.edu.au" name="eprints.creators_id" />
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<meta content="j.komdeur@rug.nl" name="eprints.creators_id" />
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<meta content="2007-10-13 02:43:54" name="eprints.datestamp" />
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<meta content="Sex determination is a fundamental process governed
by diverse mechanisms. Sex ratio selection is commonly
implicated in the evolution of sex-determining systems,
although formal models are rare. Here, we argue that,
although sex ratio selection can induce shifts in sex
determination, genomic conflicts between parents and
offspring can explain why single-factor systems (e.g. XY/
XX or ZW/ZZ) are common even in species that experience
selection for biased sex ratios. Importantly, evolutionary
shifts in sex determination do not always result
in the biased production of sons and daughters sensu
sex ratio theory. Thus, equal sex ratios might be an
emergent character of sex-determining systems even
when biased sex ratios are favored by selection." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Trends in Ecology and Evolution" name="eprints.publication" />
<meta content="22" name="eprints.volume" />
<meta content="6" name="eprints.number" />
<meta content="292-297" name="eprints.pagerange" />
<meta content="10.1016/j.tree.2007.03.008" name="eprints.id_number" />
<meta content="TRUE" name="eprints.refereed" />
<meta content="0169-5347" name="eprints.issn" />
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<meta content="1 Bull, J.J. (1983) Evolution of Sex-Determining Mechanisms, Benjamin/
Cummings
2 Kraak, S.B.M. and Pen, I. (2002) Sex-determining mechanisms in
vertebrates. In Sex Ratios: Concepts and Research Methods (Hardy,
I.C.M., ed.), pp. 158–177, Cambridge University Press
3 Ezaz, T. et al. (2006) Relationships between vertebrate ZW and XY sex
chromosome systems. Curr. Biol. 16, R736–R743
4 Marin, I. and Baker, B.S. (1998) The evolutionary dynamics of sex
determination. Science 281, 1990–1994
5 Edwards, A.W.F. (1998) Natural selection and the sex ratio: Fisher’s
sources. Am. Nat. 151, 564–569
6 Seger, J. and Stubblefield, J.W. (2002) Models of sex ratio evolution. In
Sex Ratios: Concepts and Research Methods (Hardy, I.C.M., ed.), pp. 2–
25, Cambridge University Press
7 Charlesworth, B. and Charlesworth, D. (2000) The degeneration of Y
chromosomes. Philos. Trans. R. Soc. B 355, 1563–1572
8 Bachtrog, D. (2006) A dynamic view of sex chromosome evolution. Curr.
Opin. Genet. Dev. 16, 578–585
9 Pen, I. and Weissing, F.J. (2002) Optimal sex allocation: steps towards
a mechanistic theory. In Sex Ratios: Concepts and Research Methods
(Hardy, I.C.M., ed.), pp. 26–47, Cambridge University Press
10 Fisher, R.A. (1930) The Genetical Theory of Natural Selection, Oxford
University Press
11 Werren, J.H. and Beukeboom, L.W. (1998) Sex determination, sex
ratios and genetic conflict. Annu. Rev. Ecol. Syst. 29, 233–261
12 McElreavey, K. and Fellous, M. (1997) Sex-determining genes. Trends
Endocrinol. Metab. 8, 342–346
13 Pike, T.W. and Petrie, M. (2003) Potential mechanisms of avian sex
determination. Biol. Rev. 78, 553–574
14 Elf, P.K. (2003) Yolk steroid hormones and sex determination in
reptiles with TSD. Gen. Comp. Endocrinol. 132, 349–355
15 Morjan, C.L. (2003) How rapidly can maternal behaviour affecting
primary sex ratio evolve in a reptile with environmental sex
determination? Am. Nat. 162, 205–219
16 Doody, J.S. et al. (2006) Nest site choice compensates for climate effects
on sex ratios in a lizard with environmental sex determination. Evol.
Ecol. 20, 307–330
17 Kozielska, M. et al. (2006) Sex ratio selection and multi-factorial sex
determination in the housefly: a dynamic model. J. Evol. Biol. 19, 879–
888
18 Komdeur, J. et al. (2002) Pre-ovulation control of hatchling sex ratio in
the Seychelles warbler. Proc. R. Soc. B 269, 1067–1072
19 Trivers, R.L. (1974) Parent–offspring conflict. Am. Zool. 14, 249–264
20 Pen, I. (2006) When boys want to be girls: effects of mating system and
dispersal on parent–offspring sex ratio conflict. Evol. Ecol. Res. 8, 103–
113
21 Werren, J.H. and Hatcher, M.J. (2000) Maternal–zygotic gene conflict
over sex determination: effects of inbreeding. Genetics 155, 1469–1479
22 Werren, J.H. et al. (2002) Maternal–offspring conflict leads to
the evolution of dominant zygotic sex determination. Heredity 88,
102–111
23 Uller, T. (2006) Sex-specific sibling interactions and offspring fitness in
vertebrates: patterns and implications for maternal sex ratios. Biol.
Rev. 81, 207–217
24 Clutton-Brock, T.H. et al. (1985) Parental investment and sex
differences in juvenile mortality in birds and mammals. Nature 313,
131–133
25 Hamilton, W.D. (1967) Extraordinary sex ratios. Science 156, 477–488
26 Krackow, S. (2002) Why parental sex ratio manipulation is rare in
higher vertebrates. Ethology 108, 1041–1056
27 Sheldon, B.C. and West, S.A. (2005) Maternal dominance, maternal
condition, and offspring sex ratio in ungulate mammals. Am. Nat. 163,
40–54
28 West, S.A. et al. (2005) Sex-ratio adjustment when relatives interact: a
test of constraints on adaptation. Evolution 59, 1211–1228
29 Janzen, F.J. and Phillips, P.C. (2006) Exploring the evolution of
environmental sex determination, especially in reptiles. J. Evol.
Biol. 19, 1775–1784
30 Wapstra, E. et al. (2007) Disentangling the complexities of vertebrate
sex allocation: a role for squamate reptiles? Oikos (in press)
31 Girondot, M. and Pieau, C. (1999) A fifth hypothesis for the evolution of
TSD in reptiles. Trends Ecol. Evol. 14, 359–360
32 Korpelainen, H. (1990) Sex ratios and conditions required for
environmental sex. Biol. Rev. 65, 147–184
33 Charnov, E.L. and Bull, J.J. (1977) When is sex environmentally
determined? Nature 266, 828–830
34 Shine, R. (1999) Why is sex determined by nest temperature in many
reptiles? Trends Ecol. Evol. 14, 186–189
35 Bulmer, M.G. and Bull, J.J. (1982) Models of polygenic sex
determination and sex ratio control. Evolution 36, 13–26
36 Freedberg, S. and Taylor, D.R. (2007) Sex ratio variance and the
maintenance of environmental sex determination. J. Evol. Biol. 20,
213–220
37 Van Dooren, T.J.M. and Leimar, O. (2003) The evolution of
environmental and genetic sex determination in fluctuating
environments. Evolution 57, 2667–2677
38 Shine, R. et al. (2002) Co-occurrence of multiple, supposedly
incompatible modes of sex determination in a lizard population.
Ecol. Lett. 5, 486–489
39 Heinsohn, R. et al. (1997) Extreme bias in sex allocation in Eclectus
parrots. Proc. R. Soc. B 264, 1325–1329
40 Komdeur, J. et al. (1997) Extreme adaptive modification in sex ratio of
the Seychelles warbler’s eggs. Nature 385, 552–555
41 West, S.A. and Sheldon, B.C. (2002) Constraints in the evolution of sex
ratio adjustment. Science 290, 1685–1688
42 Ainsworth, C.C. (1999) Sex Determination in Plants, Bios Scientific
43 Cook, J.M. (2002) Sex determination in invertebrates. In Sex Ratios:
Concepts and Research Methods (Hardy, I.C.M., ed.), pp. 178–194,
Cambridge University Press
44 Du¨ bendorfer, A. et al. (2002) Musca domestica, a window on the
evolution of sex-determining mechanisms in insects. Int. J. Dev.
Biol. 46, 175–179
45 Sarre, S.D. et al. (2004) The ends of a continuum: genetic and
temperature-dependent sex determination in reptiles. BioEssays 26,
639–645
46 Valenzuela, N. et al. (2003) Pattern does not equal process: exactly
when is sex environmentally determined? Am. Nat. 161, 676–683
47 Pomiankowski, A. et al. (2004) The evolution of the Drosophila sexdetermining
pathway. Genetics 166, 1761–1773
48 Carvalho, A.B. et al. (1998) An experimental demonstration of Fisher’s
principle: evolution of sexual proportions by natural selection. Genetics
148, 719–731
49 Elphick, M.J. and Shine, R. (1999) Sex differences in optimal incubation
temperatures in a scincid lizard species. Oecologia 118, 431–437
50 Beukeboom, L.W. et al. (2001) Why girls want to be boys. BioEssays 23,
477–480
51 Wild, G. and Taylor, P.D. (2004)Kin selection models for the co-evolution
of the sex ratio and sex-specific dispersal. Evol. Ecol. Res. 6, 481–502
52 Frank, S.A. (1986) The genetic value of sons and daughters. Heredity
56, 351–354
53 Normark, B.B. (2003) The evolution of alternative genetic systems in
insects. Annu. Rev. Entomol. 48, 397–423
54 Beye, M. et al. (2003) The gene csd is the primary signal for sexual
development in the honeybee and encodes an SR-type protein. Cell 114,
419–429
55 Van Wilgenburg, E. et al. (2006) Single locus complementary sex determination
in Hymenoptera: an ‘unintelligent’ design? Front. Zool. 3, 1
56 Normark, B.B. (2006) Maternal kin groups and the origins of
asymmetrical genetic systems – genomic imprinting, haplodiploidy
and parthenogenesis. Evolution 60, 631–642
57 Haig, D. (2000) The kinship theory of genomic imprinting. Annu. Rev.
Ecol. Syst. 31, 9–32
58 Normark, B.B. (2003) Haplodiploidy as an outcome of coevolution
between male-killing cytoplasmic elements and their host. Evolution
58, 790–798
59 Engelsta¨ dter, J. and Hurst, G.D.D. (2006) Can maternally transmitted
endosymbionts facilitate the evolution of haplodiploidy? J. Evol. Biol.
19, 194–202" name="eprints.referencetext" />
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<meta content="Pen, Ido" name="DC.creator" />
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<meta content="Sex determination is a fundamental process governed
by diverse mechanisms. Sex ratio selection is commonly
implicated in the evolution of sex-determining systems,
although formal models are rare. Here, we argue that,
although sex ratio selection can induce shifts in sex
determination, genomic conflicts between parents and
offspring can explain why single-factor systems (e.g. XY/
XX or ZW/ZZ) are common even in species that experience
selection for biased sex ratios. Importantly, evolutionary
shifts in sex determination do not always result
in the biased production of sons and daughters sensu
sex ratio theory. Thus, equal sex ratios might be an
emergent character of sex-determining systems even
when biased sex ratios are favored by selection." name="DC.description" />
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<h1 class="ep_tm_pagetitle">The evolution of sex ratios and sex-determining systems</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Uller, Tobias</span> and <span class="person_name">Pen, Ido</span> and <span class="person_name">Wapstra, Erik</span> and <span class="person_name">Beukeboom, Leo W.</span> and <span class="person_name">Komdeur, Jan</span> (2007) <xhtml:em>The evolution of sex ratios and sex-determining systems.</xhtml:em> Trends in Ecology and Evolution, 22 (6). pp. 292-297. ISSN 0169-5347</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2185/1/2007%2520Uller%2520et%2520al%2520TREE%2520(sex%2520det%2520systems).pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2185/1/2007%2520Uller%2520et%2520al%2520TREE%2520(sex%2520det%2520systems).pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />334Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2731" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1016/j.tree.2007.03.008">http://dx.doi.org/10.1016/j.tree.2007.03.008</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Sex determination is a fundamental process governed
by diverse mechanisms. Sex ratio selection is commonly
implicated in the evolution of sex-determining systems,
although formal models are rare. Here, we argue that,
although sex ratio selection can induce shifts in sex
determination, genomic conflicts between parents and
offspring can explain why single-factor systems (e.g. XY/
XX or ZW/ZZ) are common even in species that experience
selection for biased sex ratios. Importantly, evolutionary
shifts in sex determination do not always result
in the biased production of sons and daughters sensu
sex ratio theory. Thus, equal sex ratios might be an
emergent character of sex-determining systems even
when biased sex ratios are favored by selection.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270205.html">270000 Biological Sciences > 270200 Genetics > 270205 Genetic Development (incl. Sex Determination)</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2185</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Erik Wapstra</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">13 Oct 2007 13:43</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2185;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2185">item control page</a></p>
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