Otolith isotopic characterization as a nursery habitat indicator for stone flounder Platichthys bicoloratus
Otolith isotopic characterization as a nursery habitat indicator for stone flounder Platichthys bicoloratus
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耳石同位素表征作为石鲽 Platichthys bicoloratus 育苗栖息地指标
DOI：
10.1016/j.ecss.2022.108028
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Shirai Kotaro
中科院分区：
文献类型：
--
作者：
Amano Yosuke;Otake Tsuguo;Togashi Hiroyuki;Wada Toshihiro;Kasai Akihide;Kato Yoshikazu;Yoshimizu Chikage;Tayasu Ichiro;Kurita Yutaka;Shirai Kotaro
河口和沿开放海岸暴露的近海区域一直是石鲽Platichthys bicoloratus的一些比目鱼物种的重要繁殖地。为了评估根据不同盐度条件区分繁殖生境类型的有用性，我们检查了从四种栖息地类型收集的石鲆幼鱼的耳石稳定同位素比（δ18Ootolith和δ13Cotolith） 位于宫城县仙台湾周围以及日本东北部邻近福岛县的沿海地区。还测量了用于耳石分析的鱼的肌肉组织稳定同位素比率（δ15Nmusclean和δ13Cmuscle），以帮助解释耳石值变化所涉及的机制。不同类型育苗生境个体的δ18耳石值存在显着差异，可能反映了每个生境的盐度，即来自裸露近岸区域的个体价值最高，其次是来自咸水海湾、泻湖和河口区域的个体。这些结果表明，幼鱼阶段沉淀的 δ18 耳石可以作为确定每个个体在定居后在苗圃中经历的栖息地类型的可靠指标。 δ13Cotolith与δ13C肌肉相关。裸露的近海生境和河口生境之间的δ13化石明显不同，反映了这些生境之间主要食物来源生物的差异。这些同位素特征表明 δ18Ootolith 和 δ13Cotolith 分析可以提供有关石牙鲆繁殖栖息地类型的更多信息。
Both estuarine and exposed inshore areas along the open coast have been known as important nursery grounds for some flatfish species belonging stone flounderPlatichthys bicoloratus.To evaluate the usefulness for distinguishing the nursery habitat types according to different salinity conditions, we examined the otolith stable isotopic ratios (δ18Ootolithandδ13Cotolith) of juvenile stone flounder collected from four habitat types located around Sendai Bay, Miyagi Prefecture, as well as along the coastal areas of neighboring Fukushima Prefecture, northeastern Japan. Muscle tissue stable isotopic ratios (δ15Nmuscleandδ13Cmuscle) of fish used for otolith analyses were also measured for assisting in the interpretation of mechanisms involved in the variations in otolith values. Theδ18Ootolithvalues were significantly different among individuals from different types of nursery habitat, likely reflecting salinity of each habitat, namely the value of individuals from the exposed inshore area being the highest, followed in order by those from brackish embayment, lagoon, and river mouth areas. These results suggest that theδ18Ootolithprecipitated during the juvenile stage can be a reliable proxy to determine the habitat type experienced by each individual on nursery ground after settlement. Theδ13Cotolithwas associated withδ13Cmuscle. Theδ13Cotolithwas markedly different between exposed inshore and estuarine habitats, reflecting the difference in major food source organisms between those habitats. Those isotopic characteristics suggest thatδ18Ootolithandδ13Cotolithanalysis can provide additional information about nursery habitat type of stone flounder.
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发表时间：
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