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首页> 外文期刊>Canadian Journal of Zoology >Isotopic reconstruction of marine food webs using cephalopod beaks: new insight from captively raised Sepia officinalis
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Isotopic reconstruction of marine food webs using cephalopod beaks: new insight from captively raised Sepia officinalis

机译：使用头足类喙对海洋食物网进行同位素重建：圈养的乌贼墨新发现

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Cephalopod beaks are a valuable source of material for stable isotope analysis to reconstruct the feeding ecology of cephalopods and their predators. We conducted a controlled captive-rearing experiment on the cuttlefish Sepia officinalis L., 1758 to10 months of age. During the first and second months of life, animals were fed mysids (Mysidopsis sp.) and shrimp (Palaemonetes pugio Holthuis, 1949), but after 2 months, they were fed a homogeneous diet of shrimp (Far-fantepenaeus aztecus (Ives, 1891) and Litopenaeus setiferus (L., 1767)) until sampling. Soft tissues such as buccal mass, arm, and mantle were enriched in 15~N over the shrimp diet by about 3.3%o, with little change in 13~C, a result in keeping with previous findings for other marine predators. However, beaks showed little isotopic enrichment over the diets at the time of beak formation, with the beak rostral tips representing the neonatal diet and the remaining beak material representing the adult (shrimp) diet. Additionally, for four wild cephalopod species (Todaropsis eblanae (Ball, 1841), Illex coindetii (Verany, 1839), Loligo vulgaris (Lamarck, 1798), and S. officinalis) obtained commercially in France, we measured delta~13C and delta~15N values in lower beaks and soft tissues. Similar to the results of our captive study, soft tissues were consistently enriched in 15~N over beaks by an average of 4.8%o (range 3.9%o-6.1%o) but were slightly depleted in 13~C by 0.8%o (0.7%o-1.2%o). The isotopic measurement of cephalopod beaks can thus be used to directly trace the isotopic composition of cephalopod diets and will be a powerful tool in the reconstruction of higher-trophic-level predators of cephalopods, since beaks are often the only material remaining for analysis from field samples.
机译：头足类喙是稳定同位素分析，重建头足类动物及其捕食者摄食生态的重要材料来源。我们对1758至10个月大的乌贼墨鱼乌贼进行了人工饲养饲养实验。在生命的第一个月和第二个月，给动物喂米氏菌（Mysidopsis sp。）和虾（Palaemonetes pugio Holthuis，1949），但两个月后，给它们喂食均质的虾（Far-fantepenaeus aztecus（Ives，1891）。 ）和Litopenaeus setiferus（L.，1767））直到取样。虾饲料中的颊部，臂部和地幔等软组织的15〜N含量增加了3.3％o，而13〜C的变化很小，这与其他海洋捕食者的先前发现相符。然而，在形成喙时，喙在饮食中几乎没有同位素富集，喙的喙尖代表新生儿饮食，剩余的喙物质代表成人（虾）饮食。此外，对于在法国商业上获得的四种野生头足类物种（Todaropsis eblanae（Ball，1841年），Illex coindetii（Verany，1839年），Loligo vulgaris（Lamarck，1798年）和S. officinalis），我们测量了δ〜13C和δ〜。下喙和软组织的N值为15N。与我们的圈养研究结果相似，软组织在喙上持续富含15〜N的平均值，平均为4.8％o（范围为3.9％o-6.1％o），但在13〜C的条件下略有减少0.8％o（ 0.7％o-1.2％o）。头足类喙的同位素测量因此可用于直接追踪头足类食物的同位素组成，并且将是重构高营养级头足类捕食者的有力工具，因为喙通常是唯一可用于野外分析的材料样品。

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