To understand the relationship between turbid water and coral damage caused by the heavy rain disaster at the end of October 2010 in Amami-Oshima, Kagoshima Prefecture, Japan, turbid water and coral damage distributio...To understand the relationship between turbid water and coral damage caused by the heavy rain disaster at the end of October 2010 in Amami-Oshima, Kagoshima Prefecture, Japan, turbid water and coral damage distribution monitoring was attempted using satellite imagery and a diving survey immediately after the disaster. ALOS AVNIR-2 images (spatial resolution: 10 m) on October 6 (before the disaster), October 24, October 30, and October 31 (after the disaster) were obtained as satellite data in 2010. The red-silt deposition index (RSI) map based on the method by Nadaoka and Tamura (1992) was also created. Moreover, a diving survey was conducted via the spot check method on December 18, 2010. As a result, comparison between the high turbidity (RSI) areas estimated using AVNIR-2 data and the coral damage areas judging from the field survey was considered relatively light. It is shown that satellite data such as AVNIR-2 can be a powerful tool to monitor damage distribution of coral reefs after heavy rain.展开更多
以初始平均体重为(4.33±0.12) g的光倒刺鲃(Spinibarbus hollandi Oshima)幼鱼为研究对象,配制6个不同蛋白质含量(D1:24%、D2:28%、D3:32%、D4:36%、D5:40%、D6:44%)的等能试验饲料,研究不同蛋白水平饲料对光倒刺鲃生长、消化酶及...以初始平均体重为(4.33±0.12) g的光倒刺鲃(Spinibarbus hollandi Oshima)幼鱼为研究对象,配制6个不同蛋白质含量(D1:24%、D2:28%、D3:32%、D4:36%、D5:40%、D6:44%)的等能试验饲料,研究不同蛋白水平饲料对光倒刺鲃生长、消化酶及体成分的影响。试验在室内养殖系统中进行,每玻璃水箱(80 cm×50 cm×60 cm)饲养30尾,每组3个重复,日投喂量为鱼体重3%～5%,投喂2次,饲养8周。结果显示,光倒刺鲃幼鱼摄食蛋白质含量为40%的饲料后,其增重率(WG)、特定生长率(SGR)及饲料效率(FE)均优于其他组,且肥满度(CF)表现最好;低蛋白组(D1和D2)的饲料干物质表观消化率(ADC)显著高于高蛋白组(D5、D6)(P<0.05)。在肝脏转氨酶和肠道消化酶方面,谷丙转氨酶(GPT)、谷草转氨酶(GOT)含量均在D6组显著高于其他组(P<0.05);低蛋白组(D1、D2)淀粉酶活力显著高于其他组(P<0.05);胰蛋白酶活力随着饲料蛋白质含量的增加显著升高,后趋于平稳;而脂肪酶活力则与饲料蛋白含量呈正相关性,D6组脂肪酶活力最高。在体成分方面,鱼体粗蛋白含量随饲料蛋白水平的上升而增加,在D5组达最高;而粗脂肪含量随饲料蛋白含量的增加呈先升后降的趋势,在D6组降到最低;水分和粗灰分在各组间无明显差异(P>0.05)。综上所述,光倒刺鲃幼鱼在该阶段最适饲料蛋白质量以42.06%为宜。展开更多
文摘To understand the relationship between turbid water and coral damage caused by the heavy rain disaster at the end of October 2010 in Amami-Oshima, Kagoshima Prefecture, Japan, turbid water and coral damage distribution monitoring was attempted using satellite imagery and a diving survey immediately after the disaster. ALOS AVNIR-2 images (spatial resolution: 10 m) on October 6 (before the disaster), October 24, October 30, and October 31 (after the disaster) were obtained as satellite data in 2010. The red-silt deposition index (RSI) map based on the method by Nadaoka and Tamura (1992) was also created. Moreover, a diving survey was conducted via the spot check method on December 18, 2010. As a result, comparison between the high turbidity (RSI) areas estimated using AVNIR-2 data and the coral damage areas judging from the field survey was considered relatively light. It is shown that satellite data such as AVNIR-2 can be a powerful tool to monitor damage distribution of coral reefs after heavy rain.
