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Changes in reproductive physiology and behaviour over the nesting cycle in male three‐spined sticklebacks

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Plasma 11‐Ketotestosterone (11 KT) and testosterone (T) levels and spiggin‐mRNA levels, as well as the kidney‐somatic index (IK) were measured in sexual males and in paternal males at the middle (5 days paternal) and at the end (8 days paternal with hatched eggs) of the nesting cycle in three‐spined sticklebacks Gasterosteus aculeatus from two populations. Glueing (using threads of 11 KT induced kidney‐protein spiggin) and fanning behaviour was measured daily. Fanning increased in paternal fish and remained low in sexual males. Plasma 11 KT and T levels, on the other hand, declined significantly in parental compared to sexual males as did spiggin expression, IK and glueing behaviour. Thus, the drastic decrease in circulating 11 KT levels during the later parental phase may have resulted in an energy‐saving decrease in spiggin‐production and glueing, when this was no longer needed for nest maintenance. In addition, the mRNA levels of the ‐subunits of both gonadotropins, luteinising hormone (LH) and follicle stimulating hormone (FSH) were measured. The expression of both gonadotropins declined in the parental phase (not significant for ‐FSH in one of the populations) which was consistent with a decline in androgen levels possibly controlled via decreased gonadotropin secretion.
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Keywords: androgen; gonadotropins; reproductive behaviour; secondary sexual characteristic; spiggin

Document Type: Regular Paper

Affiliations: 1: Department of Zoology, Stockholm University, SE-106 91 Stockholm, Sweden, 2: Department of Aquaculture, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden and 3: Department of Natural Sciences, Örebro University, SE-701 82 Örebro, Sweden

Publication date: 01 May 2005

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