Functional dorsoventral symmetry in relation to lift-based swimming in the ocean sunfish Mola mola.
Functional dorsoventral symmetry in relation to lift-based swimming in the ocean sunfish Mola mola.
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DOI：
10.1371/journal.pone.0003446
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发表时间：
2008
期刊：
影响因子：
3.7
通讯作者：
Sato K
中科院分区：
文献类型：
--
作者：
Watanabe Y;Sato K
最大的硬骨鱼(可达2吨)和全球分布的硬骨鱼--海洋太阳鱼翻车鱼--通常被认为是浮游鱼，因为它的形状不寻常，包括没有尾鳍。这一普遍观点最近受到了质疑，因为声学遥测跟踪到的海洋太阳鱼的水平运动与洋流无关。然而，关于它们在自然条件下的运动性能的直接信息仍然缺乏。通过使用多传感器标签，我们发现太阳鱼确实以0.4-0.7m S-1的速度连续垂直移动，这与鲑鱼、马林鱼和中上层鲨鱼等其他大型鱼类的记录相似。加速度数据显示，它们同步地抚摸背鳍和肛鳍(主频，0.3-0.6赫兹)，以产生基于升力的推力，就像企鹅使用两个对称的鳍状肢一样。对太阳鱼(体重2~959 kg)的形态研究表明，背鳍和肛鳍具有相似的外部(对称形状和相同的面积)和内部(相同的运动肌肉质量)特征，但肌肉形状明显不同。我们的结论是，海洋太阳鱼的背鳍和肛鳍具有功能性的背腹对称性，背鳍和肛鳍是一对垂直水翼。尽管太阳鱼没有泳囊，但我们发现，由于其皮下胶状组织密度低且不可压缩，它们具有中性浮力，不受深度的影响。有效的升降式游泳与中性浮力相结合，使太阳鱼能够在水平和垂直方向上进行长距离移动。
The largest (up to 2 tons) and a globally distributed teleost—the ocean sunfish Mola mola—is commonly regarded as a planktonic fish because of its unusual shape including absence of caudal fin. This common view was recently questioned because the horizontal movements of the ocean sunfish tracked by acoustic telemetry were independent of ocean currents. However, direct information regarding their locomotor performance under natural conditions is still lacking. By using multi-sensor tags, we show that sunfish indeed swam continuously with frequent vertical movements at speeds of 0.4–0.7 m s–1, which is similar to the records of other large fishes such as salmons, marlins, and pelagic sharks. The acceleration data revealed that they stroked their dorsal and anal fins synchronously (dominant frequency, 0.3–0.6 Hz) to generate a lift-based thrust, as penguins do using two symmetrical flippers. Morphological studies of sunfish (mass, 2–959 kg) showed that the dorsal and anal fins had similar external (symmetrical shape and identical area) and internal (identical locomotory muscle mass) features; however, the muscle shape differed markedly. We conclude that ocean sunfish have functional dorsoventral symmetry with regards to the non-homologous dorsal and anal fins that act as a pair of vertical hydrofoils. Although sunfish lack a swimbladder, we found that they are neutrally buoyant independent of depth because of their subcutaneous gelatinous tissue that has low density and is incompressible. Efficient lift-based swimming in conjunction with neutral buoyancy enables sunfish to travel long distances both horizontally and vertically.
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影响因子：
2.8
作者：
Sato, K;Mitani, Y;Naito, Y
通讯作者：
Naito, Y
DOI：
10.1017/s0025315400024401
发表时间：
1978-01-01
影响因子：
1.2
作者：
BLAKE, RW
通讯作者：
BLAKE, RW
DOI：
10.1098/rspb.2000.1224
发表时间：
2000-09-22
影响因子：
4.7
作者：
Walker, JA;Westneat, MW
通讯作者：
Westneat, MW
影响因子：
2.5
作者：
Watanabe, Y;Baranov, EA;Miyazaki, N
通讯作者：
Miyazaki, N
影响因子：
2.5
作者：
Cartamil, DP;Lowe, CG
通讯作者：
Lowe, CG