Behavioral Ecology and Sociobiology

, Volume 67, Issue 8, pp 1205–1217 | Cite as

Rapid sperm evolution in the bluethroat (Luscinia svecica) subspecies complex

  • Silje Hogner
  • Terje Laskemoen
  • Jan T. Lifjeld
  • Václav Pavel
  • Bohumír Chutný
  • Javier García
  • Marie-Christine Eybert
  • Ekaterina Matsyna
  • Arild Johnsen
Original Paper

Abstract

Spermatozoa are among the most variable animal cell types, and much research is currently directed towards explaining inter- and intraspecific variation in sperm form and function. Recent comparative studies in passerine birds have found associations between the level of sperm competition and both sperm length and sperm velocity. In species with sperm competition, postcopulatory sexual selection may shape the morphology of sperm as adaptations to the female environment. The speed of evolutionary change in sperm morphology at the species level is largely unknown. In this study, we analysed variation in sperm morphology among morphologically distinct and geographically isolated bluethroat subspecies in Europe. Consistent with previous studies, our analyses of mtDNA and nuclear introns suggest recent divergence and lack of lineage sorting among the subspecies. We found significant divergence in total sperm length and in the length of some sperm components (i.e. head and midpiece). There was a significantly positive relationship between pairwise divergences in sperm morphology and mitochondrial DNA, suggesting a role for genetic drift in sperm divergence. The magnitude of sperm length divergence was considerably higher than that in other geographically structured passerines, and even higher than that observed between several pairs of sister species. We hypothesize that the rapid sperm evolution in bluethroats is driven by sperm competition, and that strong postcopulatory sexual selection on sperm traits can lead to rapid speciation through reproductive incompatibilities.

Keywords

Sperm competition Sperm morphology Sperm size variation Reproductive isolation 

Supplementary material

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Table S1(DOCX 16.7 kb)
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Table S2(DOCX 61 kb)
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Table S4(DOCX 21 kb)
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Fig. S1Maximum likelihood tree (Tamura-3-Parameter model, 10,000 bootstrap replicates) based on the intron BRM-15 (353 bp) for 53 bluethroats. Only bootstrap values above 50 % are shown. Grey = azuricollis, blue = cyanecula, red = namnetum, black = svecica and green = the outgroup L. megarhynchos (JPEG 1244 kb)
265_2013_1548_MOESM5_ESM.eps (2.6 mb)
High resolution image (EPS 2611 kb)
265_2013_1548_Fig5_ESM.jpg (1.5 mb)
Fig. S2Maximum likelihood tree (Kimura-2-Parameter model, 10,000 bootstrap replicates) based on the intron VLDLR (580 bp) for 53 bluethroats. Only bootstrap values above 50 % are shown. Grey = azuricollis, blue = cyanecula, red = namnetum, black = svecica and green = the outgroup L. megarhynchos (JPEG 1524 kb)
265_2013_1548_MOESM6_ESM.eps (3 mb)
High resolution image (EPS 3117 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Silje Hogner
    • 1
  • Terje Laskemoen
    • 1
  • Jan T. Lifjeld
    • 1
  • Václav Pavel
    • 2
  • Bohumír Chutný
    • 3
  • Javier García
    • 4
  • Marie-Christine Eybert
    • 5
  • Ekaterina Matsyna
    • 6
  • Arild Johnsen
    • 1
  1. 1.Natural History MuseumUniversity of OsloOsloNorway
  2. 2.Laboratory of OrnithologyPalacký UniversityOlomoucCzech Republic
  3. 3.Praha 10Czech Republic
  4. 4.Área de Ecología, Facultad de Ciencias Biológicas y AmbientalesUniversidad de LeónLeónSpain
  5. 5.University of Rennes 1Rennes cedexFrance
  6. 6.Laboratory of Ornithology, Ecological Centre “Dront”Nizhny NovgorodRussia

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