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南海中西部海域鸢乌贼中型群和微型群的营养生态位
Trophic niche of medium-form and dwarf-form of purple flying squid Sthenoeuthis oualaniensis in the central and western South China Sea
【摘要】 为了深入了解南海鸢乌贼不同种群的碳氮稳定同位素特征及营养生态位之间的关系,于2017年8月在南海中西部海域采集其中型群和微型群样品,分析不同胴长组的碳氮稳定同位素值和营养级变化,并比较其营养生态位差异.结果表明:中型群鸢乌贼的δ13C范围在-19.54‰~-18.10‰,δ15N范围在7.79‰~9.45‰,营养级范围在2.72~3.21,平均营养级为2.90;微型群鸢乌贼的δ13C范围为-19.69‰~-18.43‰,δ15N范围为8.02‰~8.99‰,营养级范围为2.79~3.08,平均营养级为2.91.两个鸢乌贼种群间δ13C差异不显著,δ15N差异显著.胴长显著影响了鸢乌贼的δ13C和δ15N值,且随着胴长的增大,δ15N值有增大的趋势.中型群鸢乌贼的营养生态位宽幅和营养级的多样性程度都大于微型群.
【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.
【Key words】 Sthenoteuthis oualaniensis; trophic niche; carbon and nitrogen stable isotopes; central and western South China Sea;
- 【文献出处】 应用生态学报 ,Chinese Journal of Applied Ecology , 编辑部邮箱 ,2019年08期
- 【分类号】S931.1
- 【网络出版时间】2019-06-17 16:15
- 【被引频次】5
- 【下载频次】213