Abstract

The width of trophic niches of the Kamchatka flounder Atheresthes evermanni, the Pacific halibut Hippoglossus stenolepis, and the Greenland halibut Reinhardtius matsuurae have been assessed quantitatively on the Western Kamchatka shelf of the Sea of ​​Okhotsk using the data of isotopic signatures of carbon (δ¹³C) and nitrogen (δ¹⁵N) of their prey. According to the corrected standard ellipse area, the trophic niche widths of the Kamchatka flounder, Pacific halibut, and Greenland halibut are 11.35, 9.41, and 12.36, respectively. The range of δ¹⁵N isotopic signatures (8.80–17.61) corresponds to the trophic level 2.63–5.22. According to the limits of variation of δ¹³C (–14.99… –22.9), the basic carbon sources for halibuts are the prey groups belonging to plankton, nekton, and nectobenthos. The maximum value of the niche overlap belongs to the Kamchatka flounder (93.25%) in the niche of the Greenland halibut; the minimum, on the contrary, belongs to the Greenland halibut (73.19%) in the niche of the Kamchatka flounder. The high degree in similarity of system-wide niche indicators calculated from the isotopic signatures of halibut/flounder prey is balanced by the differences of other parameters in specific habitats: depth, temperature, and food spectra variability in ontogenesis.

中文翻译：

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堪察加lo比目鱼营养壁ever的定量估计和比较，通过食物成分碳和氮的同位素组成进行比较。

摘要

堪察加比目鱼（Atheresthes evermanni），太平洋大比目鱼（Hippoglossus stenolepis）和格陵兰大比目鱼（Reinhardtius matsuurae）的营养位的宽度已在鄂霍次克海西部堪察加半岛架子上通过碳的同位素特征数据（δ ¹³ C）和氮（δ ¹⁵猎物的N）。根据校正的标准椭圆面积，堪察加比目鱼，太平洋大比目鱼和格陵兰大比目鱼的营养生态位宽度分别为11.35、9.41和12.36。的范围内的δ ^15个ñ同位素签名（8.80-17.61）对应于营养级2.63-5.22。根据δ的变化的限制¹³C（–14.99…–22.9）中，大比目鱼的基本碳源是属于浮游生物，nekton和nectobenthos的猎物。生态位重叠的最大值属于格陵兰大比目鱼生态位中的堪察加比目鱼（93.25％）；相反，最小值属于堪察加比目鱼利基市场中的格陵兰大比目鱼（73.19％）。由大比目鱼/比目鱼猎物的同位素特征计算得出的全系统生态位指标的高度相似性由特定生境中其他参数的差异平衡：本体发育中的深度，温度和食物光谱变异性。