Interaction between vasotocin and gonadal hormones in the regulation of reproductive behavior in a cichlid fish

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES acta ethologica Pub Date : 2022-10-13 DOI:10.1007/s10211-022-00404-2
Olinda Almeida, Ana S. Félix, Rui F. Oliveira
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引用次数: 1

Abstract

Vasotocin (VT) has been associated with the regulation of different aspects of social behavior (e.g., mating and aggression). Given the fact that androgens are also known to regulate reproductive behavior, we hypothesized that VT and androgens could be interacting, rather than acting independently, in the regulation of reproductive behavior. In the present study, we aimed to understand the effect of VT and its interaction with gonadal hormones (putatively androgens) on different aspects of reproductive behavior of a polygynous and territorial cichlid fish, the Mozambique tilapia (Oreochromis mossambicus). Using a within-subject design, we treated territorial males, that were previously castrated or sham-operated, with different dosages of VT as well as with a V1A receptor antagonist (Manning compound) and subsequently analyzed their behavior towards females and towards an intruder male. Our results showed that VT affected the behavior of territorial males towards females but not towards males. Specifically, VT-treated males interacted less with females (i.e., spent less time touching the transparent partition that allowed visual contact with females) and were less aggressive towards females than saline-treated males. Moreover, in sham-operated males, blocking V1A receptors increased the frequency of bites towards females in comparison to saline-treated males, but not in castrated males. This result suggests that VT down-regulates aggressiveness towards females through the action of V1A receptors in the gonads (putatively decreasing androgen secretion), and that androgens up-regulate this behavior. In summary, our results suggest that VT may modulate social behavior, through an interaction with gonadal hormones.

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后叶催产素与性腺激素在调节慈鲷生殖行为中的相互作用
催产素(VT)与社会行为的不同方面(例如,交配和攻击)的调节有关。鉴于雄激素也被认为可以调节生殖行为,我们假设VT和雄激素在调节生殖行为方面可能是相互作用的,而不是单独作用的。在本研究中,我们旨在了解VT及其与性激素(推测为雄激素)的相互作用对一夫多妻和领土鱼莫桑比克罗非鱼(Oreochromis mossambicus)生殖行为的不同方面的影响。使用受试者内设计,我们用不同剂量的VT以及V1A受体拮抗剂(Manning化合物)处理以前被阉割或假手术的领地雄性,随后分析它们对雌性和入侵者雄性的行为。结果表明,VT影响领地雄性对雌性的行为,但对雄性的行为没有影响。具体来说,与盐水处理的雄性相比,vt处理的雄性与雌性的互动更少(即,花更少的时间触摸允许与雌性进行视觉接触的透明隔板),并且对雌性的攻击性更低。此外,在假手术的雄性中,阻断V1A受体增加了对雌性的咬伤频率,而在阉割的雄性中则没有。这一结果表明,VT通过性腺中V1A受体的作用(推测会减少雄激素分泌)下调对雌性的攻击性,而雄激素则上调这种行为。总之,我们的研究结果表明VT可能通过与性腺激素的相互作用来调节社会行为。
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来源期刊
acta ethologica
acta ethologica 生物-动物学
CiteScore
1.90
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: acta ethologica publishes empirical and theoretical research papers, short communications, commentaries, reviews and book reviews as well as methods papers in the field of ethology and related disciplines, with a strong concentration on the behavior biology of humans and other animals. The journal places special emphasis on studies integrating proximate (mechanisms, development) and ultimate (function, evolution) levels in the analysis of behavior. Aspects of particular interest include: adaptive plasticity of behavior, inter-individual and geographic variations in behavior, mechanisms underlying behavior, evolutionary processes and functions of behavior, and many other topics. acta ethologica is an official journal of ISPA, CRL and the Portuguese Ethological Society (SPE)
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