在"英语"词典里nektonic}的意思

Nekton指的是积极游泳的水生生物在一个能够独立于水流移动的水体中。 Nekton可以与浮游生物形成鲜明对比，浮游生物是指存在于水体中的被动浮动，漂移或有些运动的生物，主要是微藻和细菌，小卵和海洋生物幼体，以及原生动物和其他分钟消费者。 作为指导，nekton较大，倾向于大部分以生物高的雷诺数游动，其中惯性流是规则，漩涡容易脱落。 另一方面，浮游生物很小，如果他们完全游泳，那么在生物低的雷诺数下，水的粘性行为主导，可逆的流动是规则。 生物体，如水母和其他鱼类，当它们非常小，在低雷诺数下游泳时，被认为是浮游生物，并且当它们长大到足以在高雷诺数游泳时被认为是尼克顿。 许多动物认为nekton的经典例子开始生活，作为浮游生物的微小成员，并逐渐过渡到nekton，因为他们成长。 Nekton refers to the aggregate of actively swimming aquatic organisms in a body of water able to move independently of water currents. Nekton can be contrasted with plankton, which refers to the aggregate of passively floating, drifting, or somewhat motile organisms present in a body of water, primarily tiny algae and bacteria, small eggs and larvae of marine organisms, and protozoa and other minute consumers. As a guideline, nekton are larger and tend to swim largely at biologically high Reynolds numbers, where inertial flows are the rule, and eddies are easily shed. Plankton, on the other hand, are small and, if they swim at all, do so at biologically low Reynolds numbers, where the viscous behavior of water dominates, and reversible flows are the rule. Organisms such as jellyfish and others are considered plankton when they are very small and swim at low Reynolds numbers, and considered nekton as they grow large enough to swim at high Reynolds numbers. Many animals considered classic examples of nekton start out life as tiny members of the plankton and gradually transition to nekton as they grow.