The concentration of plasma metabolites varies throughout reproduction and affects offspring number in wild brown trout (Salmo trutta)

• Published in: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Vol. 184; pp. 90 - 96
• Main Authors: Gauthey, Zoé, Freychet, Marine, Manicki, Aurélie, Herman, Alexandre, Lepais, Olivier, Panserat, Stéphane, Elosegi, Arturo, Tentelier, Cédric, Labonne, Jacques
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.06.2015; Elsevier
• Subjects: amino acids; Animals; Blood Glucose - analysis; breeding season; energy expenditure; fatty acid composition; Fatty Acids, Nonesterified - blood; Female; free fatty acids; germ cells; glucose; Life Sciences; Male; Metabolic status; Plasma metabolites; progeny; Reproduction; reproductive behavior; Reproductive Biology; Reproductive investment; Reproductive success; rivers; Salmo trutta; Salmonid; triacylglycerols; Triglycerides - blood; Trout - blood; Trout - physiology; Plasma metabolites; Metabolic status; Reproductive success; Salmonid; Reproductive investment; energy expenses; métabolisme; salmo trutta; poisson; salmonid; salmonids; metabolic status; dépense énergétique; salmonidae; fish; métabolite du plasma; reproductive investment; sea trout; plasma metabolite; reproductive success; reproduction
• ISSN: 1095-6433; 1531-4332; 1531-4332
• DOI: 10.1016/j.cbpa.2015.01.025

In wild populations, measuring energy invested in the reproduction and disentangling investment in gametes versus investment in reproductive behavior (such as intrasexual competition or intersexual preference) remain challenging. In this study, we investigated the energy expenditure in brown trout reproductive behavior by using two proxies: variation in weight and variation of plasma metabolites involved in energy production, over the course of reproductive season in a semi natural experimental river. We estimated overall reproductive success using genetic assignment at the end of the reproductive season. Results show that triglycerides and free fatty acid concentrations vary negatively during reproduction, while amino-acids and glucose concentrations remain stable. Decrease in triglyceride and free fatty acid concentrations during reproduction is not related to initial concentration levels or to weight variation. Both metabolite concentration variations and weight variations are correlated to the number of offspring produced, which could indicate that gametic and behavioral reproductive investments substantially contribute to reproductive success in wild brown trout. This study opens a path to further investigate variations in reproductive investment in wild populations.