Interspecific variation in juvenile snapper otolith chemical signatures in the northern Gulf of Mexico
Interspecific variation in juvenile snapper otolith chemical signatures in the northern Gulf of Mexico
复制标题
墨西哥湾北部幼笛鲷耳石化学特征的种间变异
DOI：
10.3354/ab00567
复制
发表时间：
2014
期刊：
影响因子：
1.4
通讯作者：
A. Shiller
中科院分区：
文献类型：
--
作者：
W. Patterson;B. Barnett;M. Z. Sluis;J. H. Cowan;A. Shiller
本研究的目的是评估是否年龄0巷笛鲷synagris耳石化学签名可以作为准确的替代品，其同源物，红笛鲷L。campechanus，墨西哥湾（GOM）苗圃区的北方。于2005年秋季在墨西哥湾北方3个地区采集红笛鲷（n = 90）和蓝笛鲷（n = 53）样品，采用扇形场电感耦合等离子体质谱（Ba：Ca，Mg：Ca，Mn：Ca，Sr：Ca，Li：Ca）和稳定同位素比值质谱（δ 13 C和δ 18 O）分析其耳石化学组成。化学特征在区域之间（MANOVA，p < 0.001）和物种之间（MANOVA，p = 0.029）存在显著差异，物种效应由分析的7种成分中的4种的显著差异驱动（ANOVA，p < 0.036）。显著的区域效应持续存在（MANOVA，p < 0.001），但当将组分值标准化为物种特异性平均值时，物种效应不显著（MANOVA，p = 0.964）。从线性判别函数计算耳石组成数据的平均区域分类准确率为84%的车道笛鲷和80%的红笛鲷是否数据进行归一化或不。最大似然模型参数化与归一化车道笛鲷耳石化学数据估计红笛鲷区域组成合理以及混合区域样本（平均误差= 9.7%之间的模型）。因此，看来0龄泳道笛鲷耳石化学特征可以作为北方GOM红笛鲷耳石化学特征的准确替代物。这些结果具有更广泛的含义，推导出自然标签的基础上，耳石化学的鱼类，可能有低丰度的部分范围。
The objective of this study was to evaluate whether age-0 lane snapper Lutjanus synagris otolith chemical signatures could serve as accurate proxies for those of its congener, red snapper L. campechanus, among northern Gulf of Mexico (GOM) nursery regions. Red (n = 90) and lane (n = 53) snappers were sampled from 3 regions of the northern GOM in fall 2005, and their otolith chemistry was analyzed with sector field-inductively coupled plasma-mass spectrom- etry (Ba:Ca, Mg:Ca, Mn:Ca, Sr:Ca, Li:Ca) or stable isotope ratio-mass spectrometry (δ 13 C and δ 18 O). Chemical signatures were significantly different among regions (MANOVA, p < 0.001) and between species (MANOVA, p = 0.029), with the species effect being driven by significant differ- ences in 4 of the 7 constituents analyzed (ANOVA, p < 0.036). The significant region effect per- sisted (MANOVA, p < 0.001), but the species effect was non-significant (MANOVA, p = 0.964) when constituent values were normalized to species-specific means. Mean regional classification accuracies from linear discriminant functions computed with otolith constituent data were 84% for lane snapper and 80% for red snapper whether data were normalized or not. Maximum likelihood models parameterized with normalized lane snapper otolith chemistry data estimated red snapper regional composition reasonably well among mixed-region samples (mean error = 9.7% among models). Therefore, it appears age-0 lane snapper otolith chemical signatures can serve as accu- rate proxies for those of red snapper in the northern GOM. These results have broader implica- tions for deriving natural tags based on otolith chemistry for fishes that may have low abundance in parts of their range.