The effects of sediment on Sargassum horneri in the early life stages on rocky subtidal reefs
文献类型: 外文期刊
作者: Bi, Yuanxin 1 ; Feng, Meiping 1 ; Jiang, Rijin 1 ; Wu, Zuli 2 ; Zhang, Shouyu 3 ; Wang, Weiding 1 ;
作者机构: 1.Marine Fisheries Res Inst Zhejiang Prov, Zhoushan 316021, Peoples R China
2.Chinese Acad Fisheries Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China
3.Shanghai Ocean Univ, Coll Marine Sci, Shanghai 201306, Peoples R China
4.Zhejiang Ocean Univ, Zhoushan 316000, Peoples R China
关键词: Macroalgae;Seaweed;Sediment;Water motion;China
期刊名称:AQUATIC BOTANY ( 影响因子:2.473; 五年影响因子:2.417 )
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收录情况: SCI
摘要: Sediment plays an important role in controlling the distribution of macroalgae. We examined the distribution of Sargassum horneri in the field considering the effect of sedimentation, and conducted sediment manipulation experiments to test the hypothesis that sedimentation affects the early settlement stages of S. horneri. Field samplings were conducted on rocky subtidal platforms off Gouqi Island, in Zhoushan Archipelago in the Eastern China Sea. Water depth and motion were also measured. Sediment traps and a suction pump were used to collect in situ sediment. In the laboratory, two experiments were conducted to test the effects of sediment cover on zygote attachment and germling survival, respectively. Attachment rate of S. horneri zygotes was reduced from 81.3% of the control group to 3.6% with a medium dusting of sediment (approx. 0.5 mm thickness), and 0% with a heavy dusting (approx. 0.7 mm thickness). For the germlings, 1.0% of survived when covered by medium (approx. 0.7 mm thickness) sediment coverage, whereas high coverage (approx. 1.8 mm thickness) caused 100% mortality. Our study showed: 1) in the field, distribution of S. horneri was negatively correlated with sediment amount, and S. horneri was always found abundant in sites with less sediment and intermediate water motion; 2) in laboratory-based experiments, small changes in the abundance of deposited sediment prevented zygote settlement; and 3) relatively small increases in settling sediment affected the survival of already settled zygotes/germlings. In conclusion, we found that sediment was an important driver of S. horneri distribution, especially during the early settlement stages. (C) 2016 Elsevier B.V. All rights reserved.
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