E. E. Peele, C. Huveneers, Culum Brown, Connor R. Gervais, K. E. Yopak
{"title":"温度升高对杰克逊港鲨鱼(Heterodontus portusjacksoni)大脑和感官发育的影响","authors":"E. E. Peele, C. Huveneers, Culum Brown, Connor R. Gervais, K. E. Yopak","doi":"10.3390/fishes8120611","DOIUrl":null,"url":null,"abstract":"Morphological differences in the peripheral (sensory) and central (brain) nervous system may confer sensory and/or behavioral variation in elasmobranchs, both across taxa and throughout ontogeny. Over the last century, sea surface temperatures have increased over 0.5 °C and are predicted to rise 1–4 °C by the year 2100, potentially affecting species’ physiological performance negatively. As the nervous system of fishes grows continually throughout their lives, it may be highly plastic in response to environmental changes. This study examined the effects of increased rearing temperature on nervous system development in Port Jackson sharks (Heterodontus portusjacksoni). Egg cases (n = 21) were collected from Gulf St. Vincent (Adelaide, SA) and placed into either ambient (17.6 °C) or 3 °C above ambient seawater conditions through hatching and reared for up to five months post-hatch. Relative volumes of the eyes and nose (olfactory rosette) were quantified using magnetic resonance imaging, and relative brain size and size of major brain regions were compared between the two treatment groups. The size of the olfactory bulbs and tegmentum varied significantly between the treatment groups, which suggest differences in primary, secondary, or tertiary sensory processing and/or motor functions at elevated temperatures. While studies on acute responses to environmental conditions cannot inform true adaptation across broad timescales, understanding the effects of increased temperature on the brain phenotype can aid in predicting how elasmobranchs may fare in response to changing ocean conditions.","PeriodicalId":12405,"journal":{"name":"Fishes","volume":"8 23","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of Increased Temperature on Brain and Sensory Development in the Port Jackson Shark (Heterodontus portusjacksoni)\",\"authors\":\"E. E. Peele, C. Huveneers, Culum Brown, Connor R. Gervais, K. E. Yopak\",\"doi\":\"10.3390/fishes8120611\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Morphological differences in the peripheral (sensory) and central (brain) nervous system may confer sensory and/or behavioral variation in elasmobranchs, both across taxa and throughout ontogeny. Over the last century, sea surface temperatures have increased over 0.5 °C and are predicted to rise 1–4 °C by the year 2100, potentially affecting species’ physiological performance negatively. As the nervous system of fishes grows continually throughout their lives, it may be highly plastic in response to environmental changes. This study examined the effects of increased rearing temperature on nervous system development in Port Jackson sharks (Heterodontus portusjacksoni). Egg cases (n = 21) were collected from Gulf St. Vincent (Adelaide, SA) and placed into either ambient (17.6 °C) or 3 °C above ambient seawater conditions through hatching and reared for up to five months post-hatch. Relative volumes of the eyes and nose (olfactory rosette) were quantified using magnetic resonance imaging, and relative brain size and size of major brain regions were compared between the two treatment groups. The size of the olfactory bulbs and tegmentum varied significantly between the treatment groups, which suggest differences in primary, secondary, or tertiary sensory processing and/or motor functions at elevated temperatures. While studies on acute responses to environmental conditions cannot inform true adaptation across broad timescales, understanding the effects of increased temperature on the brain phenotype can aid in predicting how elasmobranchs may fare in response to changing ocean conditions.\",\"PeriodicalId\":12405,\"journal\":{\"name\":\"Fishes\",\"volume\":\"8 23\",\"pages\":\"\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2023-12-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fishes\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.3390/fishes8120611\",\"RegionNum\":3,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"FISHERIES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fishes","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.3390/fishes8120611","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FISHERIES","Score":null,"Total":0}
引用次数: 0
摘要
外周(感觉)和中枢(大脑)神经系统的形态差异可能会导致鞘鳃亚纲动物在感觉和/或行为上的变异,这种变异既存在于不同类群之间,也存在于整个个体发育过程中。在过去的一个世纪中,海面温度上升了0.5 °C以上,预计到2100年将上升1-4 °C,这可能会对物种的生理表现产生负面影响。由于鱼类的神经系统在其一生中不断成长,因此在应对环境变化时可能具有很强的可塑性。本研究考察了饲养温度升高对杰克逊港鲨鱼(Heterodontus portusjacksoni)神经系统发育的影响。从圣文森特湾(南澳大利亚州阿德莱德市)收集的卵箱(n = 21)在孵化过程中被置于环境温度(17.6 °C)或高于环境温度 3 °C 的海水条件下,并在孵化后饲养长达五个月。利用磁共振成像对眼睛和鼻子(嗅栅)的相对体积进行了量化,并比较了两个处理组之间大脑的相对大小和主要脑区的大小。不同处理组的嗅球和脑桥的大小差异显著,这表明在高温条件下,初级、二级或三级感觉处理和/或运动功能存在差异。虽然对环境条件急性反应的研究无法为大时间尺度的真正适应提供信息,但了解温度升高对大脑表型的影响有助于预测鞘鳃亚纲动物如何应对不断变化的海洋条件。
Effects of Increased Temperature on Brain and Sensory Development in the Port Jackson Shark (Heterodontus portusjacksoni)
Morphological differences in the peripheral (sensory) and central (brain) nervous system may confer sensory and/or behavioral variation in elasmobranchs, both across taxa and throughout ontogeny. Over the last century, sea surface temperatures have increased over 0.5 °C and are predicted to rise 1–4 °C by the year 2100, potentially affecting species’ physiological performance negatively. As the nervous system of fishes grows continually throughout their lives, it may be highly plastic in response to environmental changes. This study examined the effects of increased rearing temperature on nervous system development in Port Jackson sharks (Heterodontus portusjacksoni). Egg cases (n = 21) were collected from Gulf St. Vincent (Adelaide, SA) and placed into either ambient (17.6 °C) or 3 °C above ambient seawater conditions through hatching and reared for up to five months post-hatch. Relative volumes of the eyes and nose (olfactory rosette) were quantified using magnetic resonance imaging, and relative brain size and size of major brain regions were compared between the two treatment groups. The size of the olfactory bulbs and tegmentum varied significantly between the treatment groups, which suggest differences in primary, secondary, or tertiary sensory processing and/or motor functions at elevated temperatures. While studies on acute responses to environmental conditions cannot inform true adaptation across broad timescales, understanding the effects of increased temperature on the brain phenotype can aid in predicting how elasmobranchs may fare in response to changing ocean conditions.