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Home for Marine Species: Seagrass Leaves as Vital Spawning Grounds and Food Source

文献类型： 外文期刊

作者： Jiang, Zhijian 1 ; Huang, Delian 5 ; Fang, Yang 1 ; Cui, Lijun 1 ; Zhao, Chunyu 1 ; Liu, Songlin 1 ; Wu, Yunchao 1 ; Chen 1 ;

作者机构： 1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Southern Marine Sci & Engn Guangdong Lab, Guangzhou, Peoples R China

4.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou, Peoples R China

5.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou, Peoples R China

6.Dezhou Univ, Coll Resources Environm & Planning, Dezhou, Peoples R China

关键词： seagrass; eggs; DNA barcoding; spawning grounds; food source

期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：4.912； 五年影响因子：5.125 ）

ISSN：

年卷期： 2020 年 7 卷

页码：

收录情况： SCI

摘要： Seagrass beds provide nursery habitats for marine species. Seagrass leaves, in particular, are used as spawning grounds and as a food source for fish and invertebrates, but direct evidence of spawning in seagrass leaves is rare. It is also very challenging to identify eggs through morphological analysis, since the eggs of many marine species appear similar. To accurately identify the eggs on the leaves of the dominant seagrass species in the South China Sea, and evaluate seasonal contribution of seagrass leaves as a food source, DNA barcoding and stable isotope technique were conducted. Interestingly, Monetaria annulus was found to spawn on the leaf sheath of Thalassia hemprichii in Li'an gang, Hainan Island. This choice of oviposition site might increase embryo survival compared to the other parts of the seagrass leaves. Meanwhile, the eggs of Stethojulis trilineata were deposited on the entire leaf of Halophila ovalis in Liusha Bay, Guangdong Province. The small fingernail-shaped leaves of H. ovalis might be beneficial for S. trilineata to lay eggs as they are closer to the sediment surface than other seagrass leaves. Based on the stable carbon and nitrogen isotope analyses, the primary food source of M. annulus in summer and in winter were particulate organic matter and seagrass, respectively. The results suggest that seagrass leaves are not only important for fish and invertebrates as a spawning site, but also as a food source. The findings of the present study may support the urgent requirement of the conservation of seagrass beds for sustaining the productivity of marine fisheries.

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