Potential fluctuation of δ13C and δ15N values of small pelagic forage fish in the Sea of Japan and East China Sea
Potential fluctuation of δ13C and δ15N values of small pelagic forage fish in the Sea of Japan and East China Sea
复制标题
日本海和东海小型中上层饲料鱼δ13C和δ15N值的潜在波动
DOI：
10.1071/mf20351
复制
发表时间：
2021
影响因子：
1.8
通讯作者：
Tanaka Hiroshige
中科院分区：
文献类型：
--
作者：
Ohshimo Seiji;Kodama Taketoshi;Yasuda Tohya;Kitajima Satoshi;Tsuji Toshihiro;Kidokoro Hideaki;Tanaka Hiroshige
许多研究使用海洋生物的稳定同位素比率来推断生态，但很少有研究考虑基线同位素值的潜在时间变化。这种变化可以反映区域营养循环和食物网生态的自然和人为变化。研究了东海和日本海3种小型中游饲料鱼（沙丁鱼、凤尾鱼、鲐鱼）22年（1998-2019）碳氮稳定同位素（δ13C和δ15N）的变化。我们使用广义线性模型（GLM）和时间序列分析（多元自回归状态空间，MARSS）计算了稳定同位素比率的年平均值，以解释环境和人为影响。基于GLM的δ13C最小二乘法均值最高为-17.2‰（2005年），最低为-18.5‰（2013年），2005 ~ 2006年急剧下降。根据MARSS时间序列，δ15N值逐渐减小，根据GLM分析，δ15N值保持稳定。饲料鱼类δ13C和δ15N的变化趋势会受到基线值变化的影响，因此，在使用稳定同位素比值推断食物网结构时，应考虑基线值的变化。
Many studies have used stable isotope ratios in marine organisms to infer ecology, but few studies have considered potential temporal changes of baseline isotopic values. Such changes can reflect natural and anthropogenic changes in regional nutrient cycling and food-web ecology. This study evaluated changes in carbon and nitrogen stable isotope ratios (δ13C and δ15N respectively) of three small pelagic forage fish species (sardine (Sardinops melanostictus), anchovy (Engraulis japonicus), chub mackerel (Scomber japonicus)) in the Sea of Japan and East China Sea over 22 years (1998–2019). We calculated annual means of both stable isotope ratios with a generalised linear model (GLM) and time-series analysis (multivariate autoregressive state-space, MARSS) to account for environmental and anthropogenic effects. The highest and lowest least-square means of δ13C on the basis of the GLM were –17.2‰ (in 2005) and –18.5‰ (in 2013) respectively, and values declined drastically from 2005 to 2006. δ15N values decreased gradually on the basis of MARSS time-series, or were stable on the basis of the GLM analysis. Trends of δ13C and δ15N of forage fish species can be affected by the changes in baseline values, and changes in baseline values should, therefore, be taken into consideration when stable isotope ratios are used to infer food-web structures.