Day and Nighttime Changes in Species Composition of Deep-Sea Demersal Fishes
Day and Nighttime Changes in Species Composition of Deep-Sea Demersal Fishes
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DOI：
10.1007/s10872-005-0031-5
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发表时间：
2005-04
影响因子：
2.3
通讯作者：
K. Suetsugu;S. Ohta
中科院分区：
文献类型：
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作者：
K. Suetsugu;S. Ohta
对KT-01-8和KT-02-5两个航次的深海底栖鱼类的种类组成进行了昼夜比较。KT-01-8在4天4夜的采集中共采集到28种742只个体，KT-02- 5在3夜4天的采集中共采集到33种128只个体。主成分分析显示，在两次考察中，有两个不同的组对应于取样时间，尽管在KT-02-5中，日出后第一次取样的物种组成与夜间取样的物种组成相似。这表明深海底层鱼类的物种组成在白天和黑夜之间发生变化。也有人认为，海面和海底之间存在时滞，在研究区500米深处，时滞为2-4小时。深海底层鱼类组成在白天和夜间之间的变化可能有两种解释：连续取样设计的人为影响和实际的鱼类洄游。由于人为影响不足以解释底层鱼类组成的变化，深海底层鱼类的垂直或水平运动可能有助于研究区域昼夜之间的区系变化。
Species compositions of deep-sea demersal fishes were compared during the day and at night in two cruises of KT-01-8 and KT-02-5. A total of 742 individuals belonging to 28 species were collected in four day and four night hauls in KT-01-8, and in KT-02- 5 128 individuals belonging to 33 species were sampled in three night and four day hauls. Principal Component Analysis (PCA) revealed that there were two distinct groups corresponding to sampling time in both cruises, although in KT-02-5 the species composition from the first haul sampled after sunrise was similar to those found in night hauls. This suggests that the species composition of deep-sea demersal fishes changes between day and night. The existence of a time lag between the sea surface and the sea floor was also suggested, lag being 2–4 hr at 500 m depths in the study area. There may be two possible explanations for the change in deep-sea demersal fish composition between daytime and nighttime: the artificial effect of successive sampling design, and actual fish migration. Since the artificial effect would not be sufficient to explain the change of demersal fish composition, the vertical or horizontal movements of deep-sea demersal fishes would contribute to the faunal change between daytime and nighttime in the study areas.