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Makiguchi Y, Ichimura M, Kitayama T, et al. Sperm allocation in relation to female size in a semelparous salmonid. R Soc Open Sci. 2016;3(12):160497doi: 10.1098/rsos.160497.
Makiguchi, Y., Ichimura, M., Kitayama, T., Kawabata, Y., Kitagawa, T., Kojima, T., & Pitcher, T. E. (2016). Sperm allocation in relation to female size in a semelparous salmonid. Royal Society open science, 3(12), 160497. https://doi.org/10.1098/rsos.160497
Makiguchi, Yuya, et al. "Sperm allocation in relation to female size in a semelparous salmonid." Royal Society open science vol. 3,12 (2016): 160497. doi: https://doi.org/10.1098/rsos.160497
Makiguchi Y, Ichimura M, Kitayama T, Kawabata Y, Kitagawa T, Kojima T, Pitcher TE. Sperm allocation in relation to female size in a semelparous salmonid. R Soc Open Sci. 2016 Dec 14;3(12):160497. doi: 10.1098/rsos.160497. eCollection 2016 Dec. PMID: 28083096; PMCID: PMC5210678.
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R Soc Open Sci. 2016 Dec 14;3(12):160497. doi: 10.1098/rsos.160497. eCollection 2016 Dec.

Sperm allocation in relation to female size in a semelparous salmonid.

Royal Society open science

Yuya Makiguchi, Masaki Ichimura, Takenori Kitayama, Yuuki Kawabata, Takashi Kitagawa, Takahito Kojima, Trevor E Pitcher

Affiliations

  1. College of Bioresource Sciences , Nihon University , 1866 Kameino, Fujisawa, Kanagawa 252-0880 , Japan.
  2. Shibetsu Salmon Museum , Shibetsu, Hokkaido 086-1631 , Japan.
  3. Institute for East China Sea Research , Nagasaki University , Nagasaki 851-2213 , Japan.
  4. Atmosphere and Ocean Research Institute , The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564 , Japan.
  5. Department of Biological Sciences, University of Windsor, Windsor, Ontario, CanadaN9B 3P4; Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, CanadaN9B 3P4.

PMID: 28083096 PMCID: PMC5210678 DOI: 10.1098/rsos.160497

Abstract

To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities. Therefore, in mating contexts where males must choose among females in a short period of time, as is the case with semelparous species (which die after one intensely competitive short duration breeding season), selection on sperm allocation can be expected to be a powerful selective agent that shapes the male reproductive success. We quantitatively investigated sperm allocation patterns in chum salmon in relation to perceived female quality by developing a novel method for determining the amount of sperm allocated per ejaculate during spawning bouts. We examined the relationship between sperm expenditure and the body size of paired females (a proxy of egg number and egg quality) in the absence of male-male competition in an experimental channel. The estimated amount of sperm released per spawning event was positively correlated with the size of paired females. However, the number of spawning events a female participated in, which reduces the number of eggs she spawns in each subsequent bout, did not affect this relationship. These results provide support for predictions arising from the sperm allocation hypothesis, male salmon do economize their sperm expenditure in accordance with paired female body size as predicted for their first spawning event, but males overestimate or are unable to assess the quality of females beyond size and provide more sperm than they should in theory when paired with a female that spawned previously. Overall, the observed sperm allocation pattern in chum salmon appears to be adapted to maximize reproductive success assuming female size is an honest indicator of quality, although temporal changes in a female's quality during a reproductive season should be considered when examining sperm allocation strategies.

Keywords: acceleration data loggers; female body size; mate choice; spawning behaviour

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