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Sexual Selection: Is Anything Left?

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Current Perspectives on Sexual Selection

Part of the book series: History, Philosophy and Theory of the Life Sciences ((HPTL,volume 9))

Abstract

The biological definition of what counts as sexual selection has gradually changed since Darwin introduced the concept. This paper reviews a sequence of definitions that reflect increasing knowledge of the diverse ways animals participate in reproductive social behavior. Later definitions accommodate more data than Darwin’s primary formulation. The latest approach, suggested in a catalyst meeting held at the National Evolution Synthesis Center in July 2013, distinguishes fertility selection as a density-dependent process from sexual-selection as a frequency-dependent process. The former consists of reproductive social behavior focussed on increasing the size of the reproductive pie, the later on securing a larger share of a given reproductive pie. The approach of social selection advocated here focusses on how to increase the size of the pie rather than on how to monopolize a larger share of a fixed pie. Social selection reverses the logic of sexual selection by starting with offspring production and working back to mating, and by starting with behavioral dynamics and working up to gene pool dynamics. In social selection courtship can potentially be deduced as a negotiation leading to an optimal allocation of tasks during offspring rearing. Mating pairs may form “teams” based on the reciprocal sharing of pleasure. The parent-offspring relation can be managed by the parent considered as the owner of a “family firm” whose product is offspring. The cooperation in reproductive social behavior may often evolve as a mutual direct benefit through individual selection rather than as some form of altruism requiring kin or multi-level selection.

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Notes

  1. 1.

    Parker and Pizarri present an “evolutionary cascade” beginning with the origin of sexual reproduction, continuing through the evolution of anisogamy, and culminating in the emergence of sexual selection, sexual conflict and characteristic sex strategies. They contend this sequence has “remarkable logical beauty” and that sexual selection is a “logical imperative” because “sexual selection emerges deductively as the logical consequence of this evolutionary succession.” I disagree. The Parker and Pizarri master narrative begins with anisogamy as an outcome of a “primordial sexual conflict” between competing gametes. This origin to their narrative is problematic. An alternative possible origin of anisogamy relies on cooperation among gametes to maximize fertilization rates. Union in an anisogamous population among many micro- with a few macro-gametes achieves more surviving zygotes than union in an isogamous population with an intermediate number of same-sized gametes (cf. Roughgarden and Iyer 2011, also termed the “Kalmus” effect). This cooperative advantage, rather than one gamete type parasitizing the investment of the other gamete type, may underlie the origin of male and female gametes. This means that the entire evolutionary cascade can veer off in a sexual-cooperation direction or a sexual-competition direction depending on unknowable initial conditions. Hence, the outcome of such a cascade is an empirical contingency, not a logical necessity. Furthermore, the Parker and Pizarri master narrative is not the only proposed master narrative. In The Genial Gene I sketched an alternative master narrative based on cooperative interactions at each step in the cascade that appears to accord better with the facts (cf. Roughgarden 2009, esp. pp. 235–248). These alternative master narratives should be subjected to test.

  2. 2.

    Parker and Pizarri endorse the Darwin-Bateman Paradigm (DBP) for typical male and female sex roles, contending not only that these sex roles are true but also are logically necessary, and that the Darwin-Bateman rationale for these sex roles provides “a powerful heuristic tool and the most parsimonious explanation for a bewildering diversity of biological patterns”. Again I disagree. The Darwin/Bateman Paradigm is not heuristic. It has not helped to understand female choice or the great many species in which the classic DBP sex roles do not occur. Adherence to the DBP requires an elaborate system of fabricated mimicries and assumptions about deceit to account for animals who do not act, or do not send the right signals, in accordance with DBP expectations. As a dominant and hegemonic paradigm, the DBP has had a chilling effect on innovation. Furthermore, parsimony is not a principle of logic. Whether a proposition is true or not is independent of whether it is simple or complicated. A parsimonious hypothesis may be so simple as to be simplistic, as indeed the DBP may be judged.

  3. 3.

    Gowaty, (Chap. 6 this volume) contends that social selection is not an alternative to sexual selection. She sees sexual selection as a subset of social selection not an alternative. Gowaty is confusing my idea of social infrastructure selection with social selection sensu West-Eberhard (1983). Of course, sexual selection is a subset of West-Eberhard’s social selection because her idea of social selection was explicitly posed as a generalization of sexual selection to begin with. Sexual selection is obviously not a subset of social infrastructure selection as diagrammed in Figs. 1 and 2.

  4. 4.

    As Gowaty (Chap. 6, this volume) notes, I have suggested in particular that “ ‘fancy traits, such as some elaborate secondary sexual characteristics, like … a peacock’s tail, a rooster’s comb, wattle and cockle-doddle-do facilitate male-male interactions’ rather than male-female interactions posited by Darwin”. Specifically, the ornaments may function as admission tickets to power holding cliques. She goes on to state that “I can imagine testing a classical idea about male-male competitive dynamics over number of mates in the absence of cliquey coalitions and male-male competitive dynamics in the presence of cliquey coalitions.” I would welcome such a test.

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Acknowlegements

I thank Thierry Hoquet for organizing the conference and for editing this volume. I also thank him for his translation of The Genial Gene into French. I thank Erol Akçay, Priya Iyer and Jeremy Van Cleve for their insight and counsel over the years.

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Correspondence to Joan Roughgarden .

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Roughgarden, J. (2015). Sexual Selection: Is Anything Left?. In: Hoquet, T. (eds) Current Perspectives on Sexual Selection. History, Philosophy and Theory of the Life Sciences, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9585-2_5

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