title: Sexual selection leads to a tenfold difference in reproductive success of alternative reproductive tactics in male Atlantic salmon.
abstract: The precocious maturation of some male Atlantic salmon (Salmo salar L.) has become a textbook example of alternative mating tactics, but the only estimates of reproductive success available so far are either the collective contribution of precocious males to reproduction in the wild or individual reproductive success in oversimplified experimental conditions. Using genetic parentage analysis on anadromous and precocious potential spawners and their offspring, we quantified components of individual reproductive success of both tactics in a natural population. On average, precocious males produced 2.24 (variance 67.62) offspring, against 27.17 (3080) for anadromous males. For both tactics, most of the variance in reproductive success was due to mating success, with 83% of precocious males having no mate, against 50% for anadromous males. Body size increased reproductive success of anadromous males and tended to decrease precocious males' reproductive success. Although these results do not solve the coexistence of alternative reproductive tactics (ARTs) in Atlantic salmon, their inclusion in comprehensive models of lifetime reproductive success should shed light on the evolution of precocious maturation in Atlantic salmon and its effect on the selection of phenotypic traits.
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France. cedric.tentelier@univ-pau.fr.
authors.forename: Cédric
authors.initials: C
authors.lastname: Tentelier
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Lepais
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France.|Department of Aquaculture and Fish Biology, Hólar University College, Háeyri 1, 550, Sauðárkrókur, Iceland.|Institute of Life and Environmental Science, University of Iceland, Sturlugata 7, 101, Reykjavík, Iceland.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Larranaga
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Manicki
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Lange
authors.affiliation: ECOBIOP, INRA, Univ. Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Rives
mesh_terms: D000818:Animals; D005075:Biological Evolution; D049628:Body Size / Q000502:physiology; D005260:Female; D008297:Male; D052586:Mating Preference, Animal / Q000502:physiology*; D008954:Models, Biological; D012098:Reproduction; D020317:Salmo salar / Q000502:physiology*
keywords: Bateman gradient; Fitness; Mature parr; Paternity share; Sexual selection; Sneaker