Feeding habits of <i>Sphaeroma retrolaeve</i> based on stable isotope analysis

Yang Mingliu; Gao Tingwei; Xing Yongze; Lan Guobao

doi:10.3969/j.issn.0253-4193.2018.08.012

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Yang Mingliu, Gao Tingwei, Xing Yongze, Lan Guobao. Feeding habits of Sphaeroma retrolaeve based on stable isotope analysis[J]. Haiyang Xuebao, 2018, 40(8): 120-128. doi: 10.3969/j.issn.0253-4193.2018.08.012

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Yang Mingliu, Gao Tingwei, Xing Yongze, Lan Guobao. Feeding habits of Sphaeroma retrolaeve based on stable isotope analysis[J]. Haiyang Xuebao, 2018, 40(8): 120-128. doi: 10.3969/j.issn.0253-4193.2018.08.012

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Feeding habits of Sphaeroma retrolaeve based on stable isotope analysis

doi: 10.3969/j.issn.0253-4193.2018.08.012

Guangxi Key Lab of Mangrove Conservation and Utilization, Guangxi Mangrove Research Center, Guangxi Sciences Academy, Beihai 536000, China

Received Date: 2017-11-16
Rev Recd Date: 2018-03-22

Abstract

Abstract

In order to explore the feeding characteristics of Sphaeroma retrolaeve, we analyzed the carbon and nitrogen isotopic ratios (δ¹³C values, δ¹⁵N values) of S. retrolaeve and its food sources which were collected from the mangrove of Lianzhou Bay, Beihai, Guangxi, in the winter of 2015 and summer of 2016, based on the stable carbon and nitrogen isotope analysis. The results showed that the average δ¹³C and δ¹⁵N values of S. retrolaeve were (-22.46±0.35) ‰ and (11.88±0.56)‰, in a range of -22.85‰ to -21.87‰ and 11.02‰ to 12.85‰, respectively. The range of δ¹³C value and the δ¹⁵N value of S. retrolaeve was small, which indicated that the food sources of S. retrolaeve were relatively simple. The results of one-way ANOVA showed that the δ¹³C values of S. retrolaeve were insignificantly different between winter and summer (P>0.05), while the δ¹⁵N values in summer were generally higher than those in winter, and the difference was significant (P<0.05); δ¹³C and δ¹⁵N values of S. retrolaeve of different growth stages significantly correlated with body size (P<0.05), which indicated that its feeding habits shift during its growth process. The δ¹³C values of S. retrolaeve were similar to the δ¹³C values of the plankton, which were far different from the δ¹³C values of the mangrove plants, indicating that the main food sources of S. retrolaeve was plankton. The results of SIAR mixing model analysis showed that contribution rates of plankton to different growth stages of S.retrolaeve were basically the same in winter and summer. The plankton with the fraction of 1.2-25 μm had the highest contribution to S. retrolaeve, and followed by the fraction of 25-50 μm, the fraction more than 100 μm had a lower contribution to S. retrolaeve with body length less than 5.5 mm, while the proportion of contribution would increase with increasing body length, which showed that there were something differences in the feeding habits for S. retrolaeve at different growth stages. The results of the feeding habits of S. retrolaeve could provide basic information for further studying the causes of Sphaeroma outbreak and the mechanism of damage to mangroves.
- Sphaeroma retrolaeve,
- food habits,
- plankton,
- stable isotope

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References(37)

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