三亚湾肥胖软箭虫成体与幼体现场摄食差异研究

doi:10.11978/2019092

Abstract

Abstract:

Chaetognatha is often the most abundant carnivorous zooplankton, and a vital food source for pelagic fish in marine ecosystem. However, their survival strategy of maintaining population structure in tropical coastal waters remains unclear. In this study, molecular method was applied to compare the field diet of juveniles and adults of dominant chaetognath species Flaccisagitta enflata in Sanya Bay. We discuss the nutritional strategies of chaetognaths maintaining substantial population structure from the perspective of resource utilization. The results show that there were 21 and 19 species fed by juveniles and adults, respectively. Copepods, small jellyfish, diatoms, and polychaets were common food groups of both juveniles and adults. Food preferences differed significantly between the juveniles and adults. Small jellyfish made up 59% of the whole diet composition in adults, while copepods became the most abundant food items (60%) in juveniles. The trophic niche of juveniles (5.16) was higher than that of adults (2.89), and trophic overlap between them was low (0.21), suggesting that chaetognaths have obvious dietary shifts during different growth stages. These results reveal that even though adults and juveniles coexist in the same region with large numbers, they can reduce food competition by feeding differentiation. This feeding strategy is of great significance for maxillary species to ensure juvenile survival and maintain substantial population structure.

Key words: chaetognaths, adults and juveniles, feeding differentiation, nutrition strategy, population structure

Lingli WANG, Simin HU, Minglan GUO, Tao LI, Youjun WANG, Hui HUANG, Sheng LIU. In situ feeding differences between adults and juveniles of chaetognath (Flaccisagitta enflata) in Sanya Bay[J].Journal of Tropical Oceanography, 2020, 39(3): 57-65.

Figures/Tables 5

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样品名称	克隆数	OTU数	Chao1	香农多样性指数H’
W3-Jul-a	55	6	16	0.45
W4-Jul-a	30	7	8.5	1.55
W9-Jul-a	38	9	16.5	1.46
合计	123	19	35.5	0.65
W3-Jul-j	36	10	13.33	1.60
W4-Jul-j	31	8	11.33	1.15
W9-Jul-j	47	10	11	1.75
合计	114	21	32.25	2.19

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In situ feeding differences between adults and juveniles of chaetognath (Flaccisagitta enflata) in Sanya Bay

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