The polyandry revolution

Pizzari, Tommaso; Wedell, Nina

doi:10.1098/rstb.2012.0041

Cited by 112 publications

(99 citation statements)

References 30 publications

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“…In most species, females are polyandrous (females copulate with multiple males) and, as a result, males are likely to encounter both competition over access to mates (pre-copulation) and fertilization (post-copulation)12. These two competitive episodes strongly influence male fitness34.…”

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confidence: 99%

Differential effects of male nutrient balance on pre- and post-copulatory traits, and consequences for female reproduction in Drosophila melanogaster

Morimoto

Wigby

2016

Sci Rep

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Male fitness depends on the expression of costly traits involved in obtaining mates (pre-copulatory) and fertilization (post-copulatory). However, very little is known about the nutrient requirements for these traits and whether males compromise their diet to maximize one trait at the expense of another. Here we used Nutritional Geometry to investigate macronutrient requirements for pre- and post-copulatory traits in Drosophila, when males were the first or second to mate with females. We found no significant effects of male diet on sperm competitiveness. However, although males self-regulate their macronutrient intake at a protein-to-carbohydrate ratio (“P:C ratio”) of 1:1.5, this ratio does not coincide with their optima for several key reproductive traits: both the short-term (~24 hr) rate of offspring production after a female’s first mating, as well as the total offspring number sired when males were second to mate were maximized at a P:C ratio of 1:9, whereas male attractiveness (latency to mate), were maximised at a P:C ratio of 1:1. These results suggest a compromised optimum diet, and no single diet that simultaneously maximizes all male reproductive traits. The protein intake of first males also negatively affected female offspring production following remating, suggesting a long-term intersexual effect of male nutrition.

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confidence: 99%

Differential effects of male nutrient balance on pre- and post-copulatory traits, and consequences for female reproduction in Drosophila melanogaster

Morimoto

Wigby

2016

Sci Rep

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“…272-273). Darwin's views on female sexual behaviour, possibly influenced by Victorian prudery [143], almost certainly delayed the onset of studies on post-ejaculatory competition by denying the now irrefutable evidence that polyandry is widespread among most sexually reproducing organisms (see [144] and accompanying articles).…”

Section: Discussionmentioning

confidence: 99%

Sexual selection in hermaphrodites, sperm and broadcast spawners, plants and fungi

Beekman

Nieuwenhuis

Ortiz‐Barrientos

et al. 2016

Phil. Trans. R. Soc. B

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One contribution of 15 to a theme issue 'Weird sex: the underappreciated diversity of sexual reproduction'. Darwin was the first to recognize that sexual selection is a strong evolutionary force. Exaggerated traits allow same-sex individuals to compete over access to mates and provide a mechanism by which mates are selected. It is relatively easy to appreciate how inter-and intrasexual selection work in organisms with the sensory capabilities to perceive physical or behavioural traits that signal mate quality or mate compatibility, and to assess the relative quality of competitors. It is therefore not surprising that most studies of sexual selection have focused on animals with separate sexes and obvious adaptations that function in the context of reproductive competition. Yet, many sexual organisms are both male and female at the same time, often lack sexual dimorphism and never come into direct contact at mating. How does sexual selection act in such species, and what can we learn from them? Here, we address these questions by exploring the potential for sexual selection in simultaneous hermaphrodites, sperm-and broadcast spawners, plants and fungi. Our review reveals a range of mechanisms of sexual selection, operating primarily after gametes have been released, which are common in many of these groups and also quite possibly in more familiar (internally fertilizing and sexually dimorphic) organisms.This article is part of the themed issue 'Weird sex: the underappreciated diversity of sexual reproduction'.

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“…Understanding the evolutionary causes and consequences of simultaneous polyandry, defined as female mating with multiple males within a single reproductive event, remains a central challenge in evolutionary ecology (Arnqvist and Nilsson 2000;Jennions and Petrie 2000;Parker and Birkhead 2013;Pizzari and Wedell 2013). One key puzzle is that direct costs of multiple mating identified in diverse systems often exceed any obvious direct benefits, meaning that polyandry can decrease females' own fitness (e.g., Rowe 1994;Fedorka et al 2004;Cornell and Tregenza 2007;Forstmeier et al 2014).…”

Section: Introductionmentioning

confidence: 99%

The Consequences of Polyandry for Sibship Structures, Distributions of Relationships and Relatedness, and Potential for Inbreeding in a Wild Population

Germain¹,

Arcese

Reid³

2018

The American Naturalist

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Online enhancements: supplemental PDF. Dryad data: http://dx.doi.org/10.5061/dryad.78568. abstract:The evolutionary benefits of simultaneous polyandry (female multiple mating within a single reproductive event) remain elusive. One potential benefit could arise if polyandry alters sibship structures and consequent relationships and relatedness among females' descendants, thereby intrinsically reducing future inbreeding risk (the indirect inbreeding avoidance hypothesis). However such effects have not been quantified in naturally complex mating systems that also encompass iteroparity, overlapping generations, sequential polyandry, and polygyny. We used long-term social and genetic pedigree data from song sparrows (Melospiza melodia) to quantify cross-generational consequences of simultaneous polyandry for offspring sibship structures and distributions of relationships and relatedness among possible mates. Simultaneous polyandry decreased full sibships and increased half-sibships, on average, but such effects varied among females and were smaller than would occur in the absence of sequential polyandry or polygyny. Further, while simultaneous polyandry decreased the overall frequencies of possible matings among adult full sibs, it increased the frequencies of possible matings among adult half-sibs and more distant relatives. These results imply that the intrinsic consequences of simultaneous polyandry for inbreeding risk could cause weak indirect selection on polyandry, but the magnitude and direction of such effects will depend on complex interactions with other mating system components and the form of inbreeding depression.

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The polyandry revolution

Abstract: One contribution of 14 to a Theme Issue 'The polyandry revolution'.

Cited by 112 publications

References 30 publications

Differential effects of male nutrient balance on pre- and post-copulatory traits, and consequences for female reproduction in Drosophila melanogaster

Differential effects of male nutrient balance on pre- and post-copulatory traits, and consequences for female reproduction in Drosophila melanogaster

Sexual selection in hermaphrodites, sperm and broadcast spawners, plants and fungi

The Consequences of Polyandry for Sibship Structures, Distributions of Relationships and Relatedness, and Potential for Inbreeding in a Wild Population

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