The evolutionary ecology of testicular function: size isn't everything

Ramm SA, Schärer L (2014)
Biological Reviews 89: 874-888.

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Larger testes are considered the quintessential adaptation to sperm competition. However, the strong focus on testis size in evolutionary research risks ignoring other potentially adaptive features of testicular function, many of which will also be shaped by post-mating sexual selection. Here we advocate a more integrated research programme that simultaneously takes into account the developmental machinery of spermatogenesis and the various selection pressures that act on this machinery and its products. The testis is a complex organ, and so we begin by outlining how we can think about the evolution of testicular function both in terms of the composition and spatial organisation of the testis (‘testicular histology’), as well as in terms of the logical organisation of cell division during spermatogenesis (‘testicular architecture’). We then apply these concepts to ask which aspects of testicular function we can expect to be shaped by post-mating sexual selection. We first assess the impact of selection on those traits most strongly associated with sperm competition, namely the number and kind of sperm produced. A broad range of studies now support our contention that post-mating sexual selection affects many aspects of testicular function besides gross testis size, for example, to maximise spermatogenic efficiency or to enable the production of particular sperm morphologies. We then broaden our focus to ask how testicular function is affected by fluctuation in sperm demand. Such fluctuation can occur over an individual's lifetime (for example due to seasonality in reproduction) and may select for particular types of testicular histology and architecture depending on the particular reproductive ecology of the species in question. Fluctuation in sperm demand also occurs over evolutionary time, due to shifts in the mating system, and this may have various consequences for testicular function, for example on rates of proliferation-induced mutation and for dealing with intragenomic conflict. We end by suggesting additional approaches that could be applied to study testicular function, and conclude that simultaneously considering the machinery, products and scheduling of spermatogenesis will be crucial as we seek to understand more fully the evolution of this most fundamental of male reproductive traits.
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Ramm SA, Schärer L. The evolutionary ecology of testicular function: size isn't everything. Biological Reviews. 2014;89:874-888.
Ramm, S. A., & Schärer, L. (2014). The evolutionary ecology of testicular function: size isn't everything. Biological Reviews, 89, 874-888. doi:10.1111/brv.12084
Ramm, S. A., and Schärer, L. (2014). The evolutionary ecology of testicular function: size isn't everything. Biological Reviews 89, 874-888.
Ramm, S.A., & Schärer, L., 2014. The evolutionary ecology of testicular function: size isn't everything. Biological Reviews, 89, p 874-888.
S.A. Ramm and L. Schärer, “The evolutionary ecology of testicular function: size isn't everything”, Biological Reviews, vol. 89, 2014, pp. 874-888.
Ramm, S.A., Schärer, L.: The evolutionary ecology of testicular function: size isn't everything. Biological Reviews. 89, 874-888 (2014).
Ramm, Steven A., and Schärer, Lukas. “The evolutionary ecology of testicular function: size isn't everything”. Biological Reviews 89 (2014): 874-888.
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Data provided by Europe PubMed Central.

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Jeannerat E, Marti E, Berney C, Janett F, Bollwein H, Sieme H, Burger D, Wedekind C., Mol Ecol 27(4), 2018
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Indirect genetic effects and sexual conflicts: Partner genotype influences multiple morphological and behavioral reproductive traits in a flatworm.
Marie-Orleach L, Vogt-Burri N, Mouginot P, Schlatter A, Vizoso DB, Bailey NW, Schärer L., Evolution 71(5), 2017
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Zhu YT, Luo C, Li Y, Li H, Quan S, Deng YJ, Yang Y, Hu YH, Tan WL, Chu QJ., Asian J Androl 18(6), 2016
PMID: 26486062
Early diversification of sperm size in the evolutionary history of the old world leaf warblers (Phylloscopidae).
Supriya K, Rowe M, Laskemoen T, Mohan D, Price TD, Lifjeld JT., J Evol Biol 29(4), 2016
PMID: 26781541
Sperm traits differ between winged and wingless males of the ant Cardiocondyla obscurior.
Schrempf A, Moser A, Delabie J, Heinze J., Integr Zool 11(6), 2016
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Sperm competition-induced plasticity in the speed of spermatogenesis.
Giannakara A, Schärer L, Ramm SA., BMC Evol Biol 16(), 2016
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Male-biased sex ratio does not promote increased sperm competitiveness in the seed beetle, Callosobruchus maculatus.
McNamara KB, Robinson SP, Rosa ME, Sloan NS, van Lieshout E, Simmons LW., Sci Rep 6(), 2016
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Evolutionary change in testes tissue composition among experimental populations of house mice.
Firman RC, Garcia-Gonzalez F, Thyer E, Wheeler S, Yamin Z, Yuan M, Simmons LW., Evolution 69(3), 2015
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Arbore R, Sekii K, Beisel C, Ladurner P, Berezikov E, Schärer L., Front Zool 12(), 2015
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Beyond Testis Size: Links between Spermatogenesis and Sperm Traits in a Seasonal Breeding Mammal.
Pintus E, Ros-Santaella JL, Garde JJ., PLoS One 10(10), 2015
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Sperm competition risk drives plasticity in seminal fluid composition.
Ramm SA, Edward DA, Claydon AJ, Hammond DE, Brownridge P, Hurst JL, Beynon RJ, Stockley P., BMC Biol 13(), 2015
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Sperm competition and the evolution of reproductive systems.
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PMID: 25323973

155 References

Data provided by Europe PubMed Central.

Organization of seminiferous epithelium in primates: relationship to spermatogenic efficiency, phylogeny, and mating system.
Wistuba J, Schrod A, Greve B, Hodges JK, Aslam H, Weinbauer GF, Luetjens CM., Biol. Reprod. 69(2), 2003
PMID: 12700190
Sperm allocation in the three-spined stickleback
Zbinden, Journal of Fish Biology 59(), 2001
Melanocytes in the testes of Eupemphix nattereri (Anura, Leiuperidae): histological, stereological, and ultrastructural aspects
Zieri, The Anatomical Record 290(), 2007

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