Feeding ecology of Limnoperna fortunei in southern China: insights from stable isotopes and fatty-acid biomarkers

Feeding ecology of Limnoperna fortunei in southern China: insights from stable isotopes and fatty-acid biomarkers
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中国南方的Limnoperna Fortunei的摄食生态学:来自稳定同位素和脂肪酸生物标志物的见解

DOI:
10.1080/02705060.2017.1399930
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发表时间:
2017-01
影响因子:
1.3
通讯作者:
Jing Lu
Jing Lu
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Ruijian Zhang;Bin Cui;Zhimin Sun;Wuyang Zhou;Pengfei Ren;Zhili Du;Nanhao He;Jing Lu

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摘要 Limnoperna Fortunei (L. Fortunei) 是东南亚最丰富的淡水双壳类动物之一,对生态系统具有广泛的直接和间接影响。为了估计 L. Fortunei 栖息地的物质流,采用稳定同位素和脂肪酸分析相结合的方法来评估 L. Fortunei 在中国南方的摄食范围。利用同位素混合模型,估计浮游生物对浮游生物的饮食贡献比例为19.8%~28.2%,颗粒有机物(POM)为57.6%~65.2%,沉积物有机物为10.2%~21.1%。我们得出结论,POM 是 L. Fortunei 的主要食物来源。 POM 到 L. Fortunei 的固定碳 δ13C 富集率为 0.67%~2.41%。根据脂肪酸数据,估计L. Fortunei消耗或选择性积累了绿藻纲、隐藻纲、甲藻纲、细菌和陆地有机物。 L. Fortunei 的摄食谱与 Dreissena polymorpha 相似。我们认为,L. Fortunei 能够利用化学线索和颗粒的表面特性来区分合适的食物。
ABSTRACT Limnoperna fortunei (L. fortunei) is one of the most abundant freshwater bivalves in southeast Asia, with wide-ranging direct and indirect impacts on ecosystems. To estimate material flows in the habitats of L. fortunei, a combination of stable-isotope and fatty-acid analyses were applied to assess the feeding spectrum of L. fortunei in southern China. Using the isotope-mixing model, the contribution proportions to the diet of L. fortunei were estimated as 19.8%–28.2% for plankton, 57.6%–65.2% for particulate organic matter (POM) and 10.2%–21.1% for sediment organic matter. We conclude that POM is the principal food source of L. fortunei. The δ13C enrichment of fixed carbon from POM to L. fortunei was 0.67%–2.41%. Based on the fatty acid data, it was estimated that L. fortunei consumed or selectively accumulated Chlorophyceae, Cryptophyceae, Dinophyceae, bacteria and terrestrial organic matter. The feeding spectrum of L. fortunei is similar to that of Dreissena polymorpha. We suggest that L. fortunei is able to differentiate suitable food items using chemical cues and the surface properties of particles.
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