Département Eaux, Forêts et Environnement, Institut National Polytechnique Félix Houphouët Boigny, BP 1313, Yamoussoukro, Cote d'Ivoire; Laboratoire de Biologie et Cytologie Animales, Unité de Formation et de Recherche Science de la Nature, Université Nangui-Abrogoua, 02 BP 801, Abidjan 02, Cote d'Ivoire; Laboratoire Ressources Halieutiques, Institut Français de Recherche pour l'Exploitation de la Mer, L'Houmeau, 17137, France.
Laboratoire de Biologie et Cytologie Animales, Unité de Formation et de Recherche Science de la Nature, Université Nangui-Abrogoua, 02 BP 801, Abidjan 02, Cote d'Ivoire.
Zoology (Jena). 2020 Dec;143:125831. doi: 10.1016/j.zool.2020.125831. Epub 2020 Jul 30.
We characterised, for the first-time, the sound production of black-chinned tilapia Sarotherodon melanotheron and show differences with that of Nile tilapia Oreochromis niloticus in a hybridization pairing context. Although both species were able to produce drum sounds, they showed different acoustic features. Drum sounds were produced in aggressive (chasing or lateral attack) and non-aggressive (courtship) contexts by O. niloticus but only in aggressive situations (fleeing or avoidance) by S. melanotheron. The second type of sounds produced by O. niloticus were grunts, produced in both aggressive (chasing and after biting) and non-aggressive contexts (nest building). The second type of sound produced by S. melanotheron was a rolling sound, produced only during courtship. Each species was able to produce common sounds (drum) and species-specific sounds (grunts and rolling). This implies that species can communicate without being able to understand each other because the sounds emitted may probably have different significance. Drumming corresponded only to aggressivity in S. melanotheron, whereas this was not true for O. niloticus. 11-ketotestosterone (11-kt) levels were significantly higher in male O. niloticus than male S. melanotheron, but there was no significant correlation between 11-kt or estradiol concentrations and the number of sounds produced in aggressive or non-aggressive behavioural contexts in either species. During interspecies interactions, O. niloticus drum sounds are likely considered to be aggressive by S. melanotheron and could potentially constitute a reproductive barrier between the two species.
我们首次对黑唇罗非鱼 Sarotherodon melanotheron 的发声特征进行了描述，并展示了其在杂交配对背景下与尼罗罗非鱼 Oreochromis niloticus 的发声差异。尽管这两个物种都能发出鼓音，但它们的声学特征却有所不同。在 O. niloticus 中，鼓音是在攻击（追逐或侧向攻击）和非攻击（求偶）情境下产生的，但在 S. melanotheron 中，鼓音仅在攻击（逃避或回避）情境下产生。O. niloticus 产生的第二种声音是咕噜声，在攻击（追逐和咬后）和非攻击（筑巢）情境下都能产生。S. melanotheron 产生的第二种声音是滚动声，仅在求偶期间产生。每个物种都能产生共同的声音（鼓音）和物种特异性的声音（咕噜声和滚动声）。这意味着物种可以在无法相互理解的情况下进行交流，因为发出的声音可能具有不同的意义。在 S. melanotheron 中，鼓声仅与攻击性相对应，而在 O. niloticus 中则并非如此。11-酮睾酮（11-kt）水平在雄性 O. niloticus 中显著高于雄性 S. melanotheron，但在这两个物种中，无论是在攻击还是非攻击行为情境下，11-kt 或雌二醇浓度与产生的声音数量之间均无显著相关性。在种间相互作用中，O. niloticus 的鼓声可能被 S. melanotheron 视为攻击性的，并可能成为这两个物种之间的生殖障碍。
