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標題: | 西部北太平洋臺灣東北海域浮游橈足類與浮游魚類之分佈相關 The Distributional Correlation between Planktonic Copepods and Ichthyoplankton in the Western North Pacific Northeast of Taiwan |
作者: | 鄭金釧 |
關鍵字: | 西北太平洋,浮游魚類,浮游橈足類,分佈相關,共現群,聚類分析指標生物, western N. Pacific,ichthyoplankton,planktonic copepods,distributional correlation,recurrent groups,clustering analysis,indicator species, |
出版年 : | 1998 |
學位: | 碩士 |
摘要: | 本研究探討西部北太平洋臺灣東北海域浮游橈足類(Copepods)與浮游魚類(Ichthyoplankton)之分佈相關。在1994年春季(4月23-27日,KEEP384)、1995年春季(4月15-20日,KEEP416)、以及1995年秋季(9月27日至10月2日,KEEP431)三個航次共29個測站中,121種浮游魚類與139種橈足類之總數量在對數尺度中有很好的相關(r=0.7)。在種的層次上,選取在29個測站中個體數總百分比前30名且至少出現五次的浮游魚類與橈足類,就每個物種在每個樣本的出現與否做共現群分析,結果出現關聯性成立的物種包括3種浮游魚類與24種橈足類,共分成八個共現群(Recurrent Groups)。利用這27種共現關聯成立的物種在29個測站之出現百分比進行相似性聚類分析(Similarity Cluster Analysis)則可更進一步找出在共現群中,出現機率之時空分佈相關較高的浮游魚類與橈足類之組合配對。在聚類分析中距離較相近的物種可能是對環境各因數之需求相近,所以共同出現在類似環境的機會較高,其數量的變動會因該環境某些因數變動而有共同變化趨勢;另一方面,也極有可能是互為對方的生物因數,亦即有著食性方面的關聯。 橈足類的游泳能力非常有限,成體或幼體隨著水團或洋流之運送而傳播,無法主動選擇環境型態,只能在數量之變動上反應出對環境的偏好。但浮游魚類之親魚一般具有較強的游泳能力,可以選擇環境條件適宜、食物豐富的水域作為其產卵場。若能更進一步釐清橈足類與浮游魚類之關係,將可在水團、或是經濟魚類資源之指標生物(Indicator species)方面,得到更有力的應用。 In the present study, we examined the distributional correlation between ichthyoplankton and copepods occurring in the sea northeast of Taiwan. Samples were collected during the KEEP cruises 384, 416, and 431, respectively in April 1994 and 1995, and September-October 1995. From the 29 stations in total, we identified 121 and 139 species of ichthyoplankton and copepods respectively. The logarithm transformation of abundance of ichthyoplankton was highly correlated with that of copepods (r=0.7) in our samples. The species of copepods and ichthyoplankton selected for the analysis of recurrent groups must satisfy the two conditions: a. its sum of percentage of numerical abundance of all stations is among the top 30 species; b. it occurs in 5 or more stations. The affinity of 3 ichthyoplankton and 24 copepods is significant. These species form 8 recurrent groups. We examined further the recurrent groups with clustering analysis. The close correlation between the members of the same cluster may be due to their preference for similar physical or chemical environmental factors. On the other hand, their presence together is probably a biotic phenomenon, such as predator-prey relationship. Copepods can not choose their habitat actively because of their poor swimming ability. Their dispersal is entirely at the mercy of oceanic currents and other water movements. The high abundance of a copepod species in a habitat probably is a response of the population to the local favorable environmental conditions. As for the fish, the adults are usually good swimmers and can choose a better habitat, e.g., abundance of food, for their offspring. Based on the recurrence of copepod and ichthyoplankton species, we discussed the possibility to use some copepods as indicator species to predict the presence of ichthyoplankton of some fishes, a concept that may be applied to commercial fisheries. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76382 |
全文授權: | 未授權 |
顯示於系所單位: | 動物學研究所 |
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