Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; MARE - Marine and Environmental Sciences Centre, ARNET - Aquatic Research Network, ISPA - Instituto Universitário, Lisbon, Portugal.
Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; MARE - Marine and Environmental Sciences Centre, ARNET - Aquatic Research Network, ISPA - Instituto Universitário, Lisbon, Portugal.
Mar Environ Res. 2023 Mar;185:105894. doi: 10.1016/j.marenvres.2023.105894. Epub 2023 Jan 21.
The growth of human populations has been driving an unprecedent and widespread increase in marine traffic, posing a real threat to marine biodiversity. Even though we are now aware of the negative effects of shipping noise exposure on fish, information about the impact on their early life stages continues to lack. Meagre (Argyrosomus regius) is a vocal fish that uses estuaries with high levels of anthropogenic noise pollution as both breeding areas and nurseries. Here, the effects of boat noise exposure on the development and survival of meagre larvae were studied. Embryos and larvae were exposed to either noise (boat noise playback) or control treatments (coils producing a similar electric field to the speakers) and hatching rate, survival rate, morphometric traits and stress-related biomarkers, at hatching and at 2 days-post-hatching (dph) were analyzed. Results showed no conclusive effects of the impact of boat noise playback, even though there was an increased lipid droplet consumption and a decrease in body depth at 2dph larvae under this stressor. The assessment of oxidative stress and energy metabolism-related biomarkers at hatching showed a marginal decrease in superoxide dismutase (SOD) activity and no changes in DNA damage or electron transport system activity (ETS), although it cannot be disregarded that those effects could only be visible at later stages of larval development. Whether these morphological and developmental results have implications in later stages remains to be investigated. Further studies with longer exposure and wild meagre could help deepen this knowledge and provide a better understanding of how anthropogenic noise can impact meagre early stages.
人类数量的增长一直在推动着海洋交通前所未有的广泛增长，对海洋生物多样性构成了真正的威胁。尽管我们现在已经意识到航运噪声暴露对鱼类的负面影响，但有关其对早期生命阶段影响的信息仍然缺乏。无须鳕（Argyrosomus regius）是一种发声鱼类，它将富含人为噪声污染的河口用作繁殖区和育幼场。在这里，研究了船只噪声暴露对无须鳕幼鱼发育和存活的影响。将胚胎和幼鱼暴露于噪声（船只噪声回放）或对照处理（产生与扬声器相似电场的线圈）中，并分析了孵化率、存活率、形态特征和孵化时及孵化后 2 天（2dph）的与应激相关的生物标志物。结果表明，船只噪声回放的影响没有明确的结论，尽管在这种胁迫下，2dph 幼虫的脂质滴消耗增加，体深减小。在孵化时评估氧化应激和能量代谢相关生物标志物时，超氧化物歧化酶（SOD）活性略有下降，DNA 损伤或电子传递系统活性（ETS）没有变化，但不能忽视这些影响可能仅在幼鱼发育的后期才显现出来。这些形态和发育结果是否对后期阶段有影响还有待研究。更长时间的暴露和野生无须鳕的进一步研究可以帮助深化这方面的知识，并更好地了解人为噪声如何影响无须鳕的早期阶段。
