Dietary composition and trophic position of blue swimmer crab (<i>Portunus pelagicus</i>) in Honghai Bay

Ning Jiajia; Du Feiyan; Li Yafang; Gu Yangguang; Wang Liangen

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Ning Jiajia, Du Feiyan, Li Yafang, Gu Yangguang, Wang Liangen. Dietary composition and trophic position of blue swimmer crab (Portunus pelagicus) in Honghai Bay[J]. Haiyang Xuebao, 2016, 38(10): 62-69.

Citation:

Ning Jiajia, Du Feiyan, Li Yafang, Gu Yangguang, Wang Liangen. Dietary composition and trophic position of blue swimmer crab (Portunus pelagicus) in Honghai Bay[J]. Haiyang Xuebao, 2016, 38(10): 62-69.

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Dietary composition and trophic position of blue swimmer crab (Portunus pelagicus) in Honghai Bay

South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, China;Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China;Scientific Observing and Experimental Station of South China Sea Fishery Resources and Environments, Ministry of Agriculture, Guangzhou 510300, China;Key Laboratory of South China Sea Fishery Resources Development and Utilization, Ministry of Agriculture, Guangzhou 510300, China

Received Date: 2016-01-08

Abstract

Abstract

Carbon and nitrogen stable isotope analyses were employed to explore the dietary composition and trophic position of P. pelagicus in Honghai Bay based on samples collected in May 2015. The results showed that, the average δ¹³C and δ¹⁵N values of the P. pelagicus were -16.9‰±1.3‰ and 12.1‰±2.3‰, in a range of -18.1‰ to -14.1‰ and 9.8‰ to 13.8‰, respectively, indicated that P. pelagicus feed on numerous prey species. Potential food sources of P. pelagicus were bivalves, snails, fishes, cephalopods, shrimps, crabs and algaes. Algaes were the most important prey of P. pelagicus by averagely contributing 32.5% to the diet, followed by bivalves (21.9%), shrimps (9.7%), snails (9.7%), fishes (9.6%), crabs (9.3%) and cephalopods (7.3%). The average trophic position of P. pelagicus was 2.91±0.68, and algaes, bivalves, crabs, snails, shrimps, fishes as well as cephalopods' trophic positon were 1.21±0.58, 2.00±0.25, 2.85±0.33, 2.87±0.26, 3.01±0.16, 3.08±0.18 and 3.41±0.17 respectively.
- Portunus pelagicus,
- dietary composition,
- trophic position,
- carbon and nitrogen stable isotopes

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References(41)

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