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Publications (6)0 Total impact

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    ABSTRACT: This study investigated the effects of two environmental factors, temperature and light, on larval settlement and metamorphosis in the solitary ascidian Styela canopus. The results revealed that larval settlement rates decreased with increasing temperature in the range 12-30 degrees C. We also demonstrated for the first time that pre-settlement metamorphosis of ascidian larvae can occur as a function of temperature. We suggest this could be an adaptation to avoid the greater energetic cost of active larval swimming, presumably resulting from the increasing temperature. They are able to metamorphose into passive drifting post-larvae and to continue planktonic life. This finding has implications for larval dispersal, especially under conditions of ocean warming. In addition, the effect of light intensity on larval settlement and metamorphosis was significantly different between photoperiods of 24 L : 0 D and 12 L : 12D. These results provide some insight into the complex cues affecting settlement and metamorphosis of ascidian larvae and ascidian distribution in nature. Xiamen Sci-Tech Bureau [3502Z20073014]; National Natural Science Foundation of China (NNSFC) [40276041, 40676081]
    01/2010;
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    ABSTRACT: 【英文摘要】Marine fouling organisms constitute a worldwide technical and economical problem. Environmental and human health problems associated with the use of toxic antifoulants makes it a necessity to develop environmentally friendly alternatives (Yebra et al., 2004). The present study investigated the antifouling activity of a series of hexane, ethyl acetate, ethanol and aqueous extracts from Ulva pertusa, Thalassia hemprichii, Enhalus acoroides, Tedania anhelans, Halichondria sp., Bugula neritina, Tubularia mesembryanthemum, Anthopleura sp., Notarcus leachii cirrosus, Styela plicata and Styela canopus from the southeast coast of China. Settlement inhibition of cyprid larvae of the barnacle Balanus albicostatus was used to evaluate antifouling efficacy. The EC50 value (the concentration of extract that reduced the settlement rate by 50% relative to the control) was estimated using the Spearman–Karber method. Screening of the 44 extracts showed antifouling activity in 90.9% of the hexane extracts followed by 90.9% of ethyl acetate, 72.7% of ethanol, and 36.4% of aqueous extracts. The hexane extracts of T. mesembryanthemum, N. leachii cirrosus and S. canopus, the ethyl acetate extracts of B. neritina and N. leachii cirrosus, and the ethanol extracts of B. neritina and Anthopleura sp. were the most active in inhibiting B. albicostatus settlement, with EC50 all below 50 μg/mL. At least 1 of the 4 extracts of each tested species exhibited antifouling activity, suggesting that all 11 marine sessile organisms harbored antifouling substances and they may have evolved chemical defenses against biofouling on their surfaces. The present findings could form the basis for exploring the compounds responsible for antifouling activity in these marine sessile organisms, which could be exploited not only for elucidating their potential chemical antifouling mechanisms but also for developing novel antifouling technology.
    01/2008;
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    ABSTRACT: 【中文摘要】 采用生态学单因子梯度试验方法,进行了白脊藤壶金星幼体的室内培养以及附着基、温度、盐度、幼体密度和幼体低温保存时间等因子分别对白脊藤壶金星幼体附着的影响的研究,结果表明,在培养水体为水温25℃、盐度30的膜滤海水,幼体培养密度为1只/ml,饵料为牟氏角毛藻,投饵量为(0.75—5)×105cells/ml的培养条件下,白脊藤壶无节幼体在培养4天后即大部分顺利发育至金星幼体阶段,实现了白脊藤壶金星幼体在实验室内的大量培养。另一方面,实验结果还表明,在白脊藤壶金星幼体附着抑制实验中,玻璃培养皿和聚苯乙烯六孔板都可采用作为附着基,温度、盐度、幼体密度及幼体低温保存时间的适宜范围分别为20—35℃、15—45、1—20只/ml和0—8天。本研究结果揭示了白脊藤壶可作为筛选天然海洋防污产物的模型生物,并确定了其基础实验条件的适宜范围。 【英文摘要】 Marine biofouling causes damage in marine constructions and vessels in the sea. A common practice to this global problem is coatings with various toxic chemicals such as organotin and copper, which on the other hand, harm the environment. Therefore, natural and effective non-toxic antifoulants are heavily demanded. In this study, cyprid of barnacle Balanus albicostatus was studied in lab experiment as a model animal for testing and selecting natural antifouling agents. Conditions of substratum, temperature,... 国家自然科学基金资助项目,40276041号、40676081号;; 厦门市科技项目,3502Z20073014号
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    ABSTRACT: 【中文摘要】 本文研究了铜、锌、镉、汞4种重金属无机离子及1种有机形态的锡对白脊藤壶(Balanus albicostatus)第二期无节幼体的急性毒性效应,报告了各重金属在作用时间为2、4、8、16和24h时的最高无毒浓度、最低有毒浓度、半致死浓度及各有毒浓度产生毒性作用所需的最短作用时间.结果表明所研究的不同化学形态的重金属对白脊藤壶幼体均具较高的毒性,其毒性随重金属浓度及作用时间的增大而呈逐渐上升的趋势.有机形态的锡对白脊藤壶第二期无节幼体的毒性要高于其它4种重金属无机离子的毒性,4种重金属无机离子对白脊藤壶第二期无节幼体的毒性大小顺序为:汞>铜>镉>锌.揭示了白脊藤壶第二期无节幼体的急性毒性实验具灵敏度高、指标明确、方法简便、取材方便、实验周期短、具重要的生态意义等优点,可应用于海洋中若干种重金属的污染监测. 【英文摘要】 The acute toxic effects of free ions of Cu,Zn,Cd,Hg and Sn in organic form on stage Ⅱ nauplii of the barnacle Balanus albicostatus Pilsbry were investigated.No observed effect concentration(NOEC),Lowest observed effect concentration(LOEC) and median lethal concentration(LC50) of each heavy metal to B.albicostatu nauplii at each exposure time were determined.The shortest time of exposure under each toxic concentration of heavy metals to exhibit toxic effect was also determined.Results showed that these 5 hea... 国家自然科学基金资助项目(40276041);厦门大学海洋系第三届海洋学生科研创新资助项目
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    ABSTRACT: 【英文摘要】 The larvae of ascidian Styela canopus Savigny were treated with epinephrine, norepinephrine, L-DOPA, GABA and thyroxin to test the ability of these compounds to induce or inhibit larval settlement and metamorphosis. The results showed that epinephrine, norepinephrine and L-DOPA at the concentration of 1μmol/dm 3 induced larval settlement and metamorphosis in S. canopus, with short exposure (1 h) to 1 μmol/dm 3 of L-DOPA inducing rapid settlement. In contrast, GABA at the concentrations of 0.1 ~100.0 μmol/dm...
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    ABSTRACT: 【中文摘要】 以翡翠贻贝(Perna viridisLinnaeus)足部收缩实验和白脊藤壶(Balanus albicostatasPilsbry)金星幼体附着抑制实验检测了生姜(Zingiber officinaleRoscoe)不同组分的防污活性.实验结果表明,在翡翠贻贝足部收缩实验中,生姜的六种提取物防污活性高低及其与硫酸铜的防污活性比较结果如下:乙醇冷提组分=乙醇热提组分>乙酸乙酯热提组分>乙酸乙酯冷提组分>硫酸铜>水冷提组分>水热提组分;在白脊藤壶金星幼体附着抑制实验中,生姜的六种提取物的防污活性高低排序如下:乙醇热提组分>乙醇冷提组分>乙酸乙酯冷提组分>乙酸乙酯热提组分>水冷提组分>水热提组分.本研究结果表明生姜的乙醇冷提组分、乙醇热提组分、乙酸乙酯冷提组分和乙酸乙酯热提组分均具有较高的防污活性,揭示了生姜在海洋防污中有很大的应用和发展潜力,为寻找新型的环保型海洋防污材料以及进一步研究提供了理论依据. 【英文摘要】 Extracts from Zingiber officinale Roscoe by different solvents and extraction methods was tested for antifouling activity using a foot retraction assay with mussel Perna viridis Linnaeus and a settlement inhibition assay with cyprids larvae of barnacle Balanus albicostatus Pilsbry.As the results shown,in the case of foot retraction assay with mussel P.viridis,the relative potency of extracts and bluestone in antifouling activity was:extract by ethanol at room temperature = extract by ethanol in boiling wate... 国家自然科学基金(40276041)资助