Trophic niche of medium-form and dwarf-form of purple flying squid Sthenoeuthis oualaniensis in the central and western South China Sea

doi:10.13287/j.1001-9332.201908.021

Abstract

Abstract: To explore the characteristics of carbon and nitrogen stable isotope and trophic niche between two forms (medium-form and dwarf-form) of the purple flying squid Sthenoteuthis ouala-niensis, we collected samples from the central and western South China Sea in August 2017 to analyze the values of carbon and nitrogen stable isotope and the changes of trophic level for different mantle lengths. We further compared the trophic niche differences of the two forms populations. The results showed that for the medium-form, the δ¹³C value ranged from -19.54‰ to -18.10‰ and the δ¹⁵N value ranged from 7.79‰ to 9.45‰. The average trophic level of medium-form was 2.90 and ranged from 2.72 to 3.21. For the dwarf-form, the δ¹³C value ranged from -19.69‰ to -18.43‰, and the δ¹⁵N value ranged from 8.02‰ to 8.99‰. The average trophic level of the dwarf-form was 2.91 and ranged from 2.79 to 3.08. There were significant differences of δ¹⁵N but no differences of δ¹³C values between the medium-form and dwarf-form of purple flying squid. The mantle length had a significant impact on δ¹³C and δ¹⁵N, with the value of δ¹⁵N increasing with the mantle length. The trophic niche breadth and the trophic level of the medium-form purple flying squid were more diverse than those of dwarf-form.

HUANG Jia-xing, GONG Yu-yan, XU Shan-nan, CHEN Zuo-zhi, ZHANG Jun, YU Wen-ming. Trophic niche of medium-form and dwarf-form of purple flying squid Sthenoeuthis oualaniensis in the central and western South China Sea[J]. Chinese Journal of Applied Ecology, 2019, 30(8): 2822-2828.

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