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相關文獻
- Relationship between the Zooplankton Biomass and the Acoustic Volume Backscattering Strength at 38 kHz in the Waters off Northern Taiwan
- 聲波遙測技術運用於臺灣周邊海域浮游動物生物量變動之調查
- Catch Estimation Using Acoustic Data Obtained from Research Vessel's Routine Surveys in the Coastal Waters of Northern Taiwan
- A Comparison between Two Mesh Sizes of Bongo Net for Collecting Fish Larvae
頁籤選單縮合
題名 | Relationship between the Zooplankton Biomass and the Acoustic Volume Backscattering Strength at 38 kHz in the Waters off Northern Taiwan=臺灣北部海域體積散射強度與生物密度關係之研究 |
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作者姓名(中文) | 高似嘉; 李明安; | 書刊名 | 臺灣水產學會刊 |
卷期 | 39:1 2012.03[民101.03] |
頁次 | 頁1-10 |
分類號 | 439.2 |
關鍵詞 | 聲探計測; 浮游動物生物量; 網目大小; 體積散射強度; Acoustic estimation; Zooplankton biomass; Mesh size; Volume backscattering strength; |
語文 | 英文(English) |
中文摘要 | 本研究蒐集2008年12月及2009年6月海研二號於臺灣北部海域所測得之EK500魚探系統(頻率38 kHz)觀測資料,並搭配Bongo net浮游生物網垂直拖曳採集之浮游生物樣本,以探討聲探資料推估4種200, 330, 500及1,000 μm不同網目採集生物量(B200, B330, B500及B1000)間的差異。在物種組成方面,每個網目所採集到之主要優勢物種皆為橈足類,分別佔各個網目整體生物數量的77%、75%、67% 及52%,顯示採集到的物種組成會隨著網目的不同而改變。而各網目之體積散射強度與採樣生物量對數值成一正相關,其中又以200 μm所推估之生物量最高,並隨著網目的增大而逐漸遞減。經共變數分析(ANCOVA)檢定結果顯示,網目200, 330, 與500 μm各關係式間之斜率及截距皆無顯著差異,但與1,000 μm有明顯顯著差異。因此本研究建議可將該三種網目之關係式合併,亦即:Sv38 = 9.45 logB200~500 - 94.60 (n = 51, r = 0.76, p < 0.05).Sv38 = 8.56 logB1000 - 87.48 (n = 17, r = 0.74, p < 0.05). |
英文摘要 | Acoustical and biological samplings of zooplankton in the waters off northern Taiwan were carried out by the "Ocean Researcher II" in 2008~2009. The volume backscattering strength (Sv) was measured at 38 kHz; meanwhile, a joined Bongo net with different mesh sizes of 200, 330 500, and 1,000 μm was dragged vertically to collect biological organisms.The dominant systematic species groups were copepods which accounted for 77%, 75%, 67%, and 52% of the total number of zooplankton with respective mesh sizes of 200, 330, 500, and 1,000 μm. Linear relationships between the logarithm of the zooplankton density (B; mg/m^3) and Sv (dB) at 38 kHz for the four mesh sizes were found. Using an ANCOVA test to compare the slopes and intercepts of the four equations, the results showed that the intercepts and slopes of the equations for mesh sizes of 200, 330, and 500 μm did not significantly differ, but there were significant differences between the intercepts for the equation for the 1,000-μm mesh.Results suggested that those three equations could be combined into the equation: Sv38 = 9.45 logB200~500 - 94.60 (n = 51, r = 0.76, p < 0.05), while the equation for 1000 μm was Sv38 = 8.56 logB1000 - 87.48 (n = 17, r = 0.74, p < 0.05). The discrepancy between the two intercepts was 7.12 dB. Possible influences for the difference of the two equations are also discussed in this study. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。