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24(1)_Tiger shark

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Volume 24, Issue 1 – 05 June 2018

Natascha Wosnick, Bianca de Sousa Rangel, André Sucena Afonso, Hugo Bornatowski, Fábio Hissa Vieira Hazin, Renata Guimarães Moreira and Carolina Arruda Freire: Hormones and migration in tiger sharks (Galeocerdo cuvier): can they be related?, pp. 9-14

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SINGLE PAPER

Volume 24, Issue 1 – 05 June 2018

Natascha Wosnick, Bianca de Sousa Rangel, André Sucena Afonso, Hugo Bornatowski, Fábio Hissa Vieira Hazin, Renata Guimarães Moreira and Carolina Arruda Freire: Hormones and migration in tiger sharks (Galeocerdo cuvier): can they be related?, pp. 9-14

Abstract

Behaviors associated with reproduction, territorial defense and hierarchical position within a population are strongly shaped by the endocrine system and may influence breeding, feeding, and migratory patterns. This study examined the link between endocrine reproductive parameters [plasma Testosterone (T), Progesterone (P4) and 17β-estradiol (E2)], total cholesterol and movement behavior of three juvenile males of similar size tagged with a satellite transmitter off Fernando de Noronha Archipelago (FEN), Brazil. The results suggested a possible link between the parameters and the movement pattern observed. This preliminary analysis indicates that hormonal profile might thus be, at least partially, related to the habitat shift observed, being consistent to the regulating role of the endocrine system as an evolutionary adaptation molded to e.g. avoid interspecific competition or to optimize foraging efficiency in species which move through wide-ranging home-ranges such as the tiger shark.