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Vitellogenesis in the three-spined stickleback, Gasterosteus aculeatus, over the spawning cycle and at egg overripening
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0003-0022-0698
Stockholm University, Faculty of Science, Department of Zoology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Vitellogenesis was studied in the female three-spined stickleback, Gasterosteus aculeatus, a multiple-spawning fish producing several egg batches during the breeding season, over the spawning cycle and at overripening of eggs. For the spawning cycle, the females were sampled when they were ’’ready to spawn’’ and 6, 24, 48, and 72 hours post-spawning (hps). For the overripening of eggs, non-overripe (mature non-ovulated and ovulated) and overripe females were sampled from nature in the breeding season. Liver tissues were collected for relative vitellogenin mRNA levels measurements by real-time qPCR. vitellogenin mRNA was expressed at all time-points over the 3-day spawning cycle and the levels were significantly increased at 24 and 48 hps, a day before ovulation, compared to the ’’ready to spawn’’ and 6 hps females. Changes over the cycle were, however, small. The highest sample point was only 1.4 times higher than the lowest. The vitellogenin mRNA levels were positively correlated with both circulating estradiol and testosterone levels over the cycle. Overripe females had 1.5 times lower vitellogenin mRNA levels than the non-overripe non-ovulated but not than the non-overripe ovulated females. These findings suggest that vitellogenesis is rather continuous over the stickleback spawning cycle, which could be an advantage for a multiple spawner, and that overripening condition reduces vitellogenin production but does not eliminate it.

Keyword [en]
stickleback, vitellogenin, sex steroids, spawning cycle, egg overripening, vitellogenesis
National Category
Biological Sciences
Research subject
Functional Zoomorphology
Identifiers
URN: urn:nbn:se:su:diva-143275OAI: oai:DiVA.org:su-143275DiVA: diva2:1097527
Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-06-01Bibliographically approved
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
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