ABSTRACT: Understanding the underlying ecological factors that affect the distribution patterns of organisms is vital for their conservation. Cephalopods such as giant warty squids Moroteuthopsis longimana are important in the diets of marine predators, including grey-headed albatrosses Thalassarche chrysostoma, yet our understanding of their habitat and trophic ecology remains limited. We investigated the habitat and trophic niche utilised by M. longimana through the δ¹³C and δ¹⁵N profiles captured in their beaks. M. longimana beaks were collected around grey-headed albatross nests at the Prince Edward Islands during 2004 and 2013 (n = 40 beaks). The results showed distinctly Antarctic distributions (δ¹³C = -24.0 ± 1.0‰, mean ± SD) for M. longimana, consistent with albatrosses foraging at the Southwest Indian Ridge, as opposed to broader foraging zones utilised by albatrosses from Îles Crozet and Îles Kerguelen. Slightly lower δ¹⁵N values (5.4 ± 0.7‰) were found compared to other islands in the Indian Sector of the Southern Ocean, which may indicate more crustaceans in the squid diets. Sequential sampling along the lateral walls of individual beaks (n = 4) revealed ontogenetic shifts in δ¹³C and δ¹⁵N values, but individual variation in these shifts requires further investigation.

中文翻译：

---

通过对鱿鱼喙的稳定同位素分析揭示了南极爱德华王子岛群岛上的长角沙蚕的生态

摘要：了解影响生物体分布方式的潜在生态因素对于其保护至关重要。头足类动物，例如巨型疣鱿鱼，长白僵菌（Moroteuthopsis longimana）在海洋捕食者的饮食中很重要，包括灰头信天翁Thalassarche chrysostoma，但我们对其栖息地和营养生态学的理解仍然有限。我们研究了栖息地和通过利用生态位M. longimana通过δ ¹³ C和δ ^15个在他们的嘴捕捉的N个配置文件。M.longimana2004年至2013年期间，在爱德华王子岛的灰头信天翁巢穴附近收集了喙（n = 40个喙）。结果表明明显南极分布（δ ¹³ C = -24.0±1.0‰，平均值±SD）为M. longimana，与信天翁在西南印度洋脊觅食，而不是通过从ILES克罗泽和ILES信天翁利用更宽的觅食区域一致克格伦。略低δ ^15个N个值（5.4±0.7‰）被发现相比，在南大洋的印度部门其他岛屿，这可能表明在鱿鱼饮食更甲壳类动物。沿着各个喙的侧壁顺序采样（N = 4）揭示个体发育位移在δ ¹³ C和δ ¹⁵N值，但这些移位的个体差异需要进一步研究。