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Weapons Evolve Faster Than Sperm in Bovids and Cervids

Department of Zoology, Stockholm University, Svante Arrhenius väg 18b, 106 91 Stockholm, Sweden
Centre for Evolutionary Biology, School of Biological Sciences, The University of Western Australia, Crawley, WA 6009, Australia
Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
Author to whom correspondence should be addressed.
These authors contribute equally to this work.
Academic Editors: Melissah Rowe, Tomer Avidor-Reiss, Eduardo R. S. Roldán; and Heidi S. Fisher
Cells 2021, 10(5), 1062;
Received: 24 March 2021 / Revised: 25 April 2021 / Accepted: 27 April 2021 / Published: 29 April 2021
In polyandrous species, males face reproductive competition both before and after mating. Sexual selection thus shapes the evolution of both pre- and postcopulatory traits, creating competing demands on resource allocation to different reproductive episodes. Traits subject to strong selection exhibit accelerated rates of phenotypic divergence, and examining evolutionary rates may inform us about the relative importance and potential fitness consequences of investing in traits under either pre- or postcopulatory sexual selection. Here, we used a comparative approach to assess evolutionary rates of key competitive traits in two artiodactyl families, bovids (family Bovidae) and cervids (family Cervidae), where male–male competition can occur before and after mating. We quantified and compared evolutionary rates of male weaponry (horns and antlers), body size/mass, testes mass, and sperm morphometrics. We found that weapons evolve faster than sperm dimensions. In contrast, testes and body mass evolve at similar rates. These results suggest strong, but differential, selection on both pre- and postcopulatory traits in bovids and cervids. Furthermore, we documented distinct evolutionary rates among different sperm components, with sperm head and midpiece evolving faster than the flagellum. Finally, we demonstrate that, despite considerable differences in weapon development between bovids and cervids, the overall evolutionary patterns between these families were broadly consistent. View Full-Text
Keywords: male–male contest competition; sperm competition; evolutionary rates analysis; male weaponry; sexual selection; sperm morphology male–male contest competition; sperm competition; evolutionary rates analysis; male weaponry; sexual selection; sperm morphology
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MDPI and ACS Style

Reuland, C.; Simmons, L.W.; Lüpold, S.; Fitzpatrick, J.L. Weapons Evolve Faster Than Sperm in Bovids and Cervids. Cells 2021, 10, 1062.

AMA Style

Reuland C, Simmons LW, Lüpold S, Fitzpatrick JL. Weapons Evolve Faster Than Sperm in Bovids and Cervids. Cells. 2021; 10(5):1062.

Chicago/Turabian Style

Reuland, Charel, Leigh W. Simmons, Stefan Lüpold, and John L. Fitzpatrick. 2021. "Weapons Evolve Faster Than Sperm in Bovids and Cervids" Cells 10, no. 5: 1062.

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