Endocrine correlates of male polymorphism and alternative reproductive tactics in the Azorean rock-pool blenny, Parablennius sanguinolentus parvicornis

General and Comparative Endocrinology
Rui Filipe OliveiraR S Santos

Abstract

In the Azorean rock-pool blenny male sexual polymorphism occurs. Larger and older males (M+ males) fully express male secondary sex characters (SSC), particularly an anal gland that produces a sex pheromone, whereas smaller and younger sexually active males do not express SSC (M- males). Two mating tactic types can be identified among M+ males: nest-holders that establish nests and court females and floaters that move around in the breeding area and try to achieve parasitic fertilizations and/or to take over nests. Two behavioral tactic types can also be identified within M- males: satellites that are associated with particular nests and actively participate in territorial defense (when females go inside the nest to spawn they try to enter to fertilize some of the eggs) and sneakers that do not help nest holders (when spawning occurs they also try to enter the nest to fertilize eggs). It was found that M+ males have significantly higher levels of 11-ketotestosterone (KT), but not testosterone (T), than M- males [M+ male androgen levels (mean +/- SE): total T = 11.6 +/- 3.0 ng ml(-1), total KT = 4.5 +/- 1.1 ng ml(-1); M- male androgen levels (mean +/- SE): total T = 9.6 +/- 1.0 ng ml(-1), total KT = 2.5 +/- 1.1 ng ml(-1)]. There...Continue Reading

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Citations

Jan 12, 2010·Aquatic Toxicology·Minna SaaristoKai Lindström
Nov 18, 2010·Hormones and Behavior·Ariadna Rangel-NegrínDomingo Canales-Espinosa
May 20, 2015·Integrative and Comparative Biology·Melissa S LammJohn R Godwin
Nov 18, 2016·The Journal of Experimental Biology·Corinna von KuerthyMichael Taborsky
Oct 17, 2006·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Albert Frank Huascar RosRui Filipe Oliveira
Apr 26, 2003·General and Comparative Endocrinology·Teresa Modesto, Adelino V M Canário
Jul 28, 2005·Hormones and Behavior·Rui F OliveiraDavid M Gonçalves

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