title: No early gender effects on energetic status and life history in a salmonid.
abstract: Throughout an organism's early development, variations in physiology and behaviours may have long lasting consequences on individual life histories. While a large part of variation in critical life-history transitions remains unexplained, a significant proportion may be caused by early gender effects as part of gender-specific life histories shaped by sexual selection. In this study, we investigated the presence of early gender effects on the timing of emergence from gravel and the energetic status of brown trout (Salmo trutta) early stages. To investigate this question, individual measures of emergence timing, metabolic rate and energetic content were coupled for the first time with the use of a recent genetic marker for sdY (sexually dimorphic on the Y-chromosome), a master sex-determining gene. Our results show that gender does not influence the energetic content of emerging juveniles or their emergence timing. These findings suggest that gender differences may appear later throughout salmonid life history and that selective pressures associated with the critical period of emergence from gravel may shape early life-history traits similarly in both males and females.
authors.affiliation: INRAUMR 1224 EcobiopAquapôle, St Pée sur Nivelle 64310, France; Université Pau & Pays Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques Côte BasqueAnglet, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Régnier
authors.affiliation: INRAUMR 1224 EcobiopAquapôle, St Pée sur Nivelle 64310, France; Université Pau & Pays Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques Côte BasqueAnglet, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Labonne
authors.affiliation: INRAUMR 1224 EcobiopAquapôle, St Pée sur Nivelle 64310, France; Université Pau & Pays Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques Côte BasqueAnglet, France.
authors.forename: Joëlle
authors.initials: J
authors.lastname: Chat
authors.affiliation: INRA-UR1037, LPGP Fish Physiology and Genomics Rennes 35042, France.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Yano
authors.affiliation: INRA-UR1037, LPGP Fish Physiology and Genomics Rennes 35042, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Guiguen
authors.affiliation: INRAUMR 1224 EcobiopAquapôle, St Pée sur Nivelle 64310, France; Université Pau & Pays Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques Côte BasqueAnglet, France.
authors.forename: Valérie
authors.initials: V
authors.lastname: Bolliet
keywords: brown trout; emergence from gravel; energetic status; gender effects; sdY