| 摘要: |
| 长棘海星[the Crown-of-Thorns Seastar （CoTS）；Acanthasterspp.]的暴发严重破坏珊瑚礁生态系统的功能和物种多样性, 其幼虫的存活率是决定成体种群密度的关键因素之一，因此了解长棘海星浮浪幼虫阶段的摄食及营养需求对于长棘海星灾害防控至关重要。本研究选用杜氏盐藻（Dunaliella salina）、牟氏角毛藻（Chaetoceros meülleri）、亚心形扁藻（Platymonas subcordiformis）和小球藻（Chlorella vulgaris）4种微藻喂养长棘海星幼虫，通过测定不同喂养条件下长棘海星幼虫的存活率、体长、体宽和胃面积等参数，结合4种微藻的营养含量，综合分析了不同微藻对长棘海星幼虫生长发育的影响。结果表明，不同的藻类投喂对长棘海星幼虫存活和生长发育产生显著的差异。幼虫生长到第16天时，牟氏角毛藻喂养的幼虫存活率为（7.20±0.01）％，所喂养幼虫的体长（678.83 μm）、体宽（391.04 μm）和胃面积（14 628.14 μm2）均显著高于杜氏盐藻、亚心形扁藻和小球藻喂养的幼虫。藻类生理指标和营养成分分析表明，牟氏角毛藻的蛋白质含量、能量、以及C20系列脂肪酸、饱和脂肪酸和单不饱和脂肪酸均高于杜氏盐藻和小球藻，而且其大小可能比较适宜幼虫的捕食。本研究表明特定种类的饵料藻类是决定幼虫发育的关键因素。 |
| 关键词: 海洋生物学 长棘海星幼虫 浮游植物 藻类营养 幼虫发育 |
| DOI：10.3969/J.ISSN.2095-4972.20230214001 |
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| 基金项目:海南省三沙市海洋和渔业局项目（SSHY-2201） |
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| Effects of four microalgae on the survival and growth of Acanthasterspp.larvae |
| SU Nan,ZHANG Ying,YANG Litong,CHEN Huizhen,GAO Qian,CHEN Chang,YANG Yufeng |
| (Institute of Hydrobiology, Jinan University, Guangzhou 510632 , China;CAS Key Laboratory of Tropical Marine Bioresources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510301 , China;University of Chinese Academy of Sciences, Beijing 100049, China;Hainan Xisha Marine Environment National Observation and Research Station, South China Sea Institute of Oceanology, Chinese Academy of Science, Sansha 573100, China) |
| Abstract: |
| The outbreak of Crown-of-Thorns Seastar（CoTS，Acanthaster spp.）is one of the major reasons damaging the function and species diversity of coral reef ecosystems. Larval survival is one of the key factors that determine adult population density. Therefore, understanding the feeding and nutritional requirements of the CoTS planktonic larval stage is critical for disaster prevention and control. In this study，four microalgae were used to feed CoTS larvae. Used the survival rate，body length，body width and stomach area of CoTS larvae under different feeding conditions and combined with the nutrient content of four microalgae，the effects of different microalgae on the growth and development of CoTS larvae were analyzed. Results showed that the algal species fed had different effects on the survival and growth of CoTS larvae. By 16th days of larval growth, the percentage survival of larvae fed with Chaetoceros meülleri was （7.20±0.01）%, and the body length (678.83 μm), body width (391.04 μm) and stomach area (14 628.14 μm2) of the fed larvae fed were significantly higher than those of larvae fed with Dunaliella salina, Platymonas subcordiformis and Chlorella vulgaris. In addition，the protein content，energy and C20 series fatty acids，saturated fatty acids and monounsaturated fatty acids of C. meulleri were higher than D. salina and C. vulgaris besides the more suitable size for larval predation. Previous studies often used chlorophyll-a concentration as a proxy for CoTS larval feeding food concentrations. Results suggest that specific alga species may be the key determinant for larval development. |
| Key words: marine biology CoTS larvae phytoplankton algal nutrition larval development |
