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Anchoveta Engraulis ringens along the Chilean coast: Management units, demographic units and water masses: Insights from multiple otolith‐based approaches
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2019-10-09 , DOI: 10.1111/fog.12455
Cristóbal Garcés 1 , Edwin J. Niklitschek 1, 2 , Guido Plaza 3 , Francisco Cerna 4 , Mathieu Leisen 5 , Pamela Toledo 1, 6 , Fernando Barra 5
Affiliation  

Three management units (MUs) are used for stock assessment and fishery regulations of anchoveta Engraulis ringens in Chilean waters (>65% of E. ringens latitudinal range): MU‐I [18–25)°S, MU‐II [25–32)°S and MU‐III [32–42)°S. To evaluate whether these three MUs correspond to separate demographic units (DUs), as well as to estimate mixing rates and spatial distribution of these DUs, we combined three types of otolith natural markers: isotopic signatures (δ13C and δ18O), elemental compositions (Na, Mg, Mn, Sr and Ba) and microstructural indexes. All otolith markers were determined in nuclear and marginal regions of juveniles and adults from cohorts 2012 and 2015. Differences in core region markers indicated spatial segregation between three environmentally distinct nursery areas, probably related to Subtropical Water (MU‐I), Subantarctic Water (MU‐III) and the Subtropical Convergence (MU‐II). Comparison of core and marginal regions, from juvenile and/or adult fish, suggested that adult fish remained nearby nursery areas, separated from fish nursed in other MUs. Nonetheless, ontogenetic migrations from warmer (offshore) nursery habitats to cooler (deeper/more coastal) feeding habitats occurred within MUs. In summary, our results support the consideration of the three MUs as three separate DUs. Estimated mixing rates indicated MU‐II received contributions of 31% from MU‐I and 3% from MU‐III, while complete segregation existed between MU‐I and MU‐III. Such mixing rates between MU‐I and MU‐III seem large enough to justify its further consideration by stock assessment models and management procedures.

中文翻译:

智利海岸的cho鱼(Anchoveta Engraulis)渐行渐远:管理单位,人口单位和水团:多种基于耳石的方法的见解

三个管理单元(亩)用于鯷鱼的股票评估和渔业规定鳀ringens在智利水域(> 65%E. ringens纬度范围):MU-I [18-25)°S,MU-II [25- 32)°S和MU‐III [32–42)°S。为了评价这三个亩对应是否人口统计单元(DUS)分开,以及估计混合率和这些的DU的空间分布,我们结合三种类型的耳石自然标记:同位素特征(δ 13 C和δ 18O),元素组成(Na,Mg,Mn,Sr和Ba)和微观结构指标。在2012年和2015年队列中,在青少年和成年人的核和边缘区域确定了所有耳石标记。核心区域标记的差异表明三个环境不同的育苗区之间的空间隔离,可能与亚热带水(MU‐I),亚南极水(MU -III)和亚热带融合(MU-II)。对幼鱼和/或成年鱼的核心和边缘区域进行的比较表明,成年鱼仍留在育苗区附近,与其他MUs中调养的鱼分开。尽管如此,MU内还是发生了从较暖的(近海)苗圃生境到较冷的(较深/沿海地区)觅食生境的成因迁移。总之,我们的结果支持将三个MU视为三个独立的DU。估计的混合比率表明,MU-II收到了MU-I贡献的31%,MU-III贡献了3%,而MU-I和MU-III之间存在完全隔离。MU-I和MU-III之间的混合率似乎足够大,足以证明需要通过库存评估模型和管理程序对其进行进一步考虑。
更新日期:2019-10-09
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