Flood tide transport of blue crab, Callinectessapidus, postlarvae: behavioral responses to salinity and turbulence
Flood tide transport of blue crab, Callinectessapidus, postlarvae: behavioral responses to salinity and turbulence
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蓝蟹、Callinectessapidus、虾苗的洪水运输：对盐度和湍流的行为反应
DOI：
10.1007/s002270100649
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发表时间：
2001
期刊：
影响因子：
2.4
通讯作者：
R. Forward
中科院分区：
文献类型：
--
作者：
J. Welch;R. Forward
抽象。蓝蟹（Callinectessapidus）后期幼虫（megalopae）使用涨潮运输上游河口在夜间涨潮。大眼幼体有一个内源性的昼夜节律的活动，这是不一致的潮汐定时行为。因此，有人假设，这种行为是由行为变化来调节，以响应与潮流相关的外源性线索。在实验室流动槽中，蓝蟹大眼幼体暴露于盐度和湍流的同时变化，以模拟河口潮汐。在模拟洪水潮，大眼幼体上升后，暴露于盐度增加，保持在高湍流的时候游泳，并在低湍流的时候下降。湍流刺激了几个小时的游泳，接近河口的潮汐流的持续时间。在模拟落潮时，降低盐度会抑制游泳。这些结果支持了大闸蟹大眼幼体对涨潮输运的调节模式：（1）涨潮时盐度的增加刺激大闸蟹大眼幼体游入水体，（2）涨潮时大眼幼体对高湍流度的反应是保持游动状态，（3）涨潮结束时，当流速和湍流度降低时，大眼幼体下降，（4）涨潮结束时，大眼幼体下降。（4）落潮时海水盐度的降低抑制了大眼幼体的游动。这是第一个模式，在一个物种缺乏潮汐节律的活动调节涨潮运输。
Abstract. Blue crab (Callinectessapidus) postlarvae (megalopae) use flood tide transport to move upstream in estuaries during nocturnal flood tides. The megalopae have a endogenous diel rhythm in activity that is inconsistent with this tidally timed behavior. Thus, it is hypothesized that this behavior is regulated by behavioral changes in response to exogenous cues associated with tidal currents. In a laboratory flow tank, blue crab megalopae were exposed to simultaneous changes in salinity and turbulence to simulate tides in an estuary. On simulated flood tides, megalopae ascended upon exposure to a salinity increase, remained swimming during times of high turbulence, and descended at times of low turbulence. Turbulence stimulated swimming for several hours, approximating the duration of tidal currents in estuaries. Swimming was inhibited by decreasing salinity on simulated ebb tides. These results support a model for regulation of flood tide transport by blue crab megalopae as follows: (1) blue crab megalopae are stimulated to swim into the water column by increasing salinity associated with flood tide; (2) megalopae remain swimming during flood tide in response to high levels of turbulence; (3) megalopae descend at the end of flood tide, when current speed and turbulence decline to low levels; and (4) megalopae are inhibited from swimming on ebb tides by the associated salinity decrease. This is the first model for regulation of flood tide transport in a species lacking a tidal rhythm in activity.