Inter-individual variability of stable-isotope ratios in marine organisms

海洋生物稳定同位素比率的个体间变异

• 批准号: 08833005
• 负责人: NISHIDA Shuhei
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08833005/
• 关键词: stable-isotope ratio; inter-individual variability; trophic level; oceanic animals; 安定同位対比

Analysis of trophic levels by using nitrogen and carbon stable-isotope ratios is advantageous to conventional food-habit analysis by gut-content examination, in that the former reflects a long-term food history of an individual animal, while the latter gives a food composition only immediately before capture. The present studies examined inter-individual variability of food-habits of pelagic fishes, meso-and bathypelagic fishes and shrimps in Sagami Bay and adjacent waters, by applying nitrogen and carbon stable-isotope ratio method along with conventional gut-content analysis.In Japanese anchovy, the individual stable-isotope ratios of both larvae and adults were clustered into two groups, with a variation of ca. 1.7% in nitrogen. In meso-and bathypelagic shrimps, Bentheogennema borealis, a non-migrant, deep-sea species, showed significantly lower delta^<13>C and higher delta^<15>N values than the two vertical migrants. Of the latter, Sergiaprehensilis showed higher delta^<15>N values in larger individuals, coinciding to the result of gut-content analysis (strong carnivory). Acanthephyra quadrispinosa, another migrant, showed delta^<15>N values similar to S.prehensilis but difference between sizes was less marked, suggesting that A.quadrispinosa take foods of higher trophic levels from relatively young stages. Maurolicus muelleri, a vertical migrant, showed inter-individual variations of delta^<15>N of ca. 1.5 times those of the three non-migrating mesopelagic fishes of the genus Cyclothone, suggesting that the former utilizes food resources from both the epi-and mesopelagic layers.In summary, the present results demonstrated that the delta values provide useful information on food characteristics and food history of individual animals and that these characteristics are closely related to other ecological characteristics of individuals, such as growth, vertical migration, and distributional depths.

通过使用氮和碳稳定 - 同位素比对营养水平进行分析对传统的食物 - 利用检查是有利的，因为前者反映了单个动物的长期食物史，而后者仅在被捕获前就能立即提供食物成分。本研究通过应用氮和碳稳定异常比例的方法，研究了萨加米湾和邻近水域中浮力鱼类的食物 - 纳位，中质和耳式鱼类和虾的个体间变异性，以及在日本储备中，两种属于日本储备的人，都可以依靠氮和碳稳定比率。大约的变化氮的1.7％。在中质和巴特拉吉虾中，非移民的深海物种底植物学北极骨出现明显低于两个垂直移民的delta^<13> C和更高的delta^<15> n值。在后者中，Sergiaprehensilis在较大个体中显示出较高的delta^<15> n值，这与肠内分析的结果（强肉食）相吻合。另一位移民的acanthephyphyra Quadrispinosa显示出类似于S. phemensilis的Delta^<15> n值，但大小之间的差异较少，这表明A.Quadrispinosa从相对年轻的阶段接受了较高营养水平的食物。垂直移民的毛洛利库斯·穆勒里（Maurolicus Muelleri）表现出CA的delta^<15> n的个体间变化。 1.5倍旋风属的三种非迁移介质鱼中的鱼类中的那些，这表明前者利用餐饮和介质层中的食品资源。总而言之，目前的结果表明，三角洲的价值观提供了有关单个动物的食物特征和食物特征的有用信息，并且这些特征与这些特征与其他人的生态相关，例如其他人的生态范围，例如，以及分布的人，例如，以及其他的生态学特征，例如，以及其他的生态学特征。