Physiological markers suggest energetic and nutritional adjustments in male sharks linked to reproduction

Bianca S. Rangel, Neil Hammerschlag, James A. Sulikowski, Renata Guimarães Moreira

Research output: Contribution to journalArticlepeer-review

Abstract

Energetic condition is one of the most important factors that influence fitness and reproductive performance in vertebrates. Yet, we lack evidence on how energetic states change in response to reproduction in large marine vertebrates. In the present study, we used a non-lethal approach to assess relationships among reproductive stage, circulating steroid hormones (testosterone and relative corticosteroid levels), plasma fatty acids, and the ketone body β-hydroxybutyrate in male sharks of two species with divergent ecologies, the benthic nurse shark (Ginglymostoma cirratum) and the epipelagic blacktip shark (Carcharhinus limbatus). We found higher relative corticosteroid levels in adult nurse sharks during the pre-mating period and in blacktip sharks during the mating period. Higher levels of β-hydroxybutyrate were found in adult nurse sharks during the mating period, but concentrations of this ketone body did not significantly vary across reproductive stages in blacktip sharks. We also detected reduced percentages of essential fatty acids during the mating period of both nurse and blacktip sharks. Taken together, our findings suggest that nurse and blacktip sharks differ in their energetic strategy to support reproduction, however, they likely rely on physiologically important fatty acids during mating, to support spermatogenesis.

Original languageEnglish (US)
Pages (from-to)989-1004
Number of pages16
JournalOecologia
Volume196
Issue number4
DOIs
StatePublished - Aug 2021
Externally publishedYes

Keywords

  • Dietary patterns
  • Elasmobranchs
  • Lipid metabolites
  • Reproductive hormones
  • Trophic markers

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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