{"title":"受人类活动影响的城市湖泊中生态环境不同的两种鱼类的雌性比例和青春期延迟。","authors":"","doi":"10.1016/j.envres.2024.119844","DOIUrl":null,"url":null,"abstract":"<div><p>In aquatic ecosystems, endocrine-disrupting compounds (EDCs) pose a growing concern for their potential adverse effects on fish reproduction and development. In lake Pyhäjärvi, located in the urban boreal region of Tampere, Finland, a significant number of sexually immature pikeperch (<em>Sander lucioperca</em>) individuals have been identified in size and age categories that are expected to be sexually mature. To explore if this phenomenon is attributed to estrogenic endocrine disruption, we conducted a comprehensive study comparing fish from lake Pyhäjärvi with those from a nearby reference lake, lake Näsijärvi. Roach (<em>Rutilus rutilus</em>), known for its susceptibility to EDCs, was also included for comparison. We examined various parameters in both pikeperch and roach, including size, condition factor, age, reproductive indicators, biometric indices and gonadal histology. We also assessed liver vitellogenin mRNA levels and genetic sex in roach, and measured estrogen levels in lake waters and wastewater treatment plant effluents. Results revealed that approximately one-third of fish in both species exhibited sexual immaturity in lake Pyhäjärvi, with a female-biased sex ratio. Surprisingly, we found no signs of estrogenic endocrine disruption, indicated by the absence of intersex fish in both species. Furthermore, vitellogenin levels in roach closely resembled those in the reference lake. Estrogens were undetectable in the lake waters, suggesting that factors other than estrogenic EDCs, including other potential endocrine disruptors such as PCBs or heavy metals, may be influencing delayed sexual maturity and skewed sex ratios. Further inquiry is needed to pinpoint these underlying causes. Our study provides essential baseline information on fish sexual development in lake Pyhäjärvi, emphasizing the need for ongoing monitoring and research to understand delayed sexual maturity and biased sex ratios. This is vital given the increasing concern about EDC impacts on aquatic ecosystems and the necessity for effective management strategies to protect these ecosystems' health and integrity.</p></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":null,"pages":null},"PeriodicalIF":7.7000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0013935124017493/pdfft?md5=bb94bb18871dfcad25654636c1bced62&pid=1-s2.0-S0013935124017493-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Female-biased sex ratios and delayed puberty in two fish species with different Ecologies in an Anthropogenically affected urban lake\",\"authors\":\"\",\"doi\":\"10.1016/j.envres.2024.119844\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In aquatic ecosystems, endocrine-disrupting compounds (EDCs) pose a growing concern for their potential adverse effects on fish reproduction and development. In lake Pyhäjärvi, located in the urban boreal region of Tampere, Finland, a significant number of sexually immature pikeperch (<em>Sander lucioperca</em>) individuals have been identified in size and age categories that are expected to be sexually mature. To explore if this phenomenon is attributed to estrogenic endocrine disruption, we conducted a comprehensive study comparing fish from lake Pyhäjärvi with those from a nearby reference lake, lake Näsijärvi. Roach (<em>Rutilus rutilus</em>), known for its susceptibility to EDCs, was also included for comparison. We examined various parameters in both pikeperch and roach, including size, condition factor, age, reproductive indicators, biometric indices and gonadal histology. We also assessed liver vitellogenin mRNA levels and genetic sex in roach, and measured estrogen levels in lake waters and wastewater treatment plant effluents. Results revealed that approximately one-third of fish in both species exhibited sexual immaturity in lake Pyhäjärvi, with a female-biased sex ratio. Surprisingly, we found no signs of estrogenic endocrine disruption, indicated by the absence of intersex fish in both species. Furthermore, vitellogenin levels in roach closely resembled those in the reference lake. Estrogens were undetectable in the lake waters, suggesting that factors other than estrogenic EDCs, including other potential endocrine disruptors such as PCBs or heavy metals, may be influencing delayed sexual maturity and skewed sex ratios. Further inquiry is needed to pinpoint these underlying causes. Our study provides essential baseline information on fish sexual development in lake Pyhäjärvi, emphasizing the need for ongoing monitoring and research to understand delayed sexual maturity and biased sex ratios. 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引用次数: 0
摘要
在水生生态系统中,干扰内分泌的化合物(EDCs)对鱼类繁殖和发育的潜在不利影响日益引起人们的关注。在位于芬兰坦佩雷城市北方地区的Pyhäjärvi湖中,发现了大量性未成熟的梭鲈鱼(Sander lucioperca)个体,而这些个体的体型和年龄类别本应达到性成熟。为了探究这种现象是否归因于雌激素内分泌紊乱,我们进行了一项综合研究,将 Pyhäjärvi 湖中的鱼类与附近参考湖 Näsijärvi 湖中的鱼类进行比较。鳊鱼(Rutilus rutilus)因易受 EDCs 影响而闻名,我们也将其纳入比较范围。我们检测了梭子鱼和鳊鱼的各种参数,包括体型、状态因子、年龄、繁殖指标、生物计量指数和性腺组织学。我们还评估了鳊鱼肝脏卵黄素 mRNA 水平和遗传性别,并测量了湖水和污水处理厂废水中的雌激素水平。结果显示,在 Pyhäjärvi 湖中,两种鱼类中约有三分之一表现出性器官不成熟,性别比例偏向雌性。令人惊讶的是,我们没有发现雌激素干扰内分泌的迹象,这表现在两种鱼类中都没有雌雄同体的鱼类。此外,蟑螂体内的卵黄素水平与参考湖中的水平非常接近。湖泊水域中检测不到雌激素,这表明除了雌激素类 EDC 之外,其他因素(包括多氯联苯或重金属等其他潜在内分泌干扰物)也可能会影响性成熟延迟和性别比例失调。要找出这些根本原因,还需要进一步的研究。我们的研究为 Pyhäjärvi 湖中鱼类的性发育提供了重要的基础信息,强调了持续监测和研究以了解性成熟延迟和性别比例失调的必要性。这一点至关重要,因为人们越来越关注 EDC 对水生生态系统的影响,并需要有效的管理策略来保护这些生态系统的健康和完整性。
Female-biased sex ratios and delayed puberty in two fish species with different Ecologies in an Anthropogenically affected urban lake
In aquatic ecosystems, endocrine-disrupting compounds (EDCs) pose a growing concern for their potential adverse effects on fish reproduction and development. In lake Pyhäjärvi, located in the urban boreal region of Tampere, Finland, a significant number of sexually immature pikeperch (Sander lucioperca) individuals have been identified in size and age categories that are expected to be sexually mature. To explore if this phenomenon is attributed to estrogenic endocrine disruption, we conducted a comprehensive study comparing fish from lake Pyhäjärvi with those from a nearby reference lake, lake Näsijärvi. Roach (Rutilus rutilus), known for its susceptibility to EDCs, was also included for comparison. We examined various parameters in both pikeperch and roach, including size, condition factor, age, reproductive indicators, biometric indices and gonadal histology. We also assessed liver vitellogenin mRNA levels and genetic sex in roach, and measured estrogen levels in lake waters and wastewater treatment plant effluents. Results revealed that approximately one-third of fish in both species exhibited sexual immaturity in lake Pyhäjärvi, with a female-biased sex ratio. Surprisingly, we found no signs of estrogenic endocrine disruption, indicated by the absence of intersex fish in both species. Furthermore, vitellogenin levels in roach closely resembled those in the reference lake. Estrogens were undetectable in the lake waters, suggesting that factors other than estrogenic EDCs, including other potential endocrine disruptors such as PCBs or heavy metals, may be influencing delayed sexual maturity and skewed sex ratios. Further inquiry is needed to pinpoint these underlying causes. Our study provides essential baseline information on fish sexual development in lake Pyhäjärvi, emphasizing the need for ongoing monitoring and research to understand delayed sexual maturity and biased sex ratios. This is vital given the increasing concern about EDC impacts on aquatic ecosystems and the necessity for effective management strategies to protect these ecosystems' health and integrity.
期刊介绍:
The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.