The role of photoreception in the swarming behavior of the copepod Dioithona oculata
The role of photoreception in the swarming behavior of the copepod Dioithona oculata
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DOI：
10.1080/10236249509378946
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发表时间：
1995-01-01
影响因子：
1
通讯作者：
Ambler, JW
中科院分区：
文献类型：
--
作者：
Buskey, EJ;Peterson, JO;Ambler, JW
桡足动物diithona oculata在红树林支柱根部附近形成密集的群，这些根以穿透红树林树冠的光束为中心，可以在实验室中用光纤光管创建的光轴中创建群。利用摄像机记录了实验室观察的群体行为，并利用视频计算机运动和图像分析技术对桡足类动物的游动行为和群体密度进行了量化。适应黑暗的桡足类动物最初表现出对光轴的疏光反应，但在暴露于光后3-5分钟内变成正的光趋向性。桡足类在光照下的聚集率符合饱和模式，表明桡足类是独立地被群体标记吸引的。桡足类动物在光线轴边缘附近遇到光线强度梯度时，会改变它们的游泳方向，这有助于维持群体的生存。在实验室中，当光强度慢至0.1 μ M光子M (-2) s（-1）时，可以形成蜂群，这与首次在自然界中观察到的黎明时的光强度相似。群的形成似乎有一种内源性的节奏，因为桡足类动物不会在夜间在光轴下形成群。
The copepod Dioithona oculata forms dense swarms near mangrove prop roots that are centered around shafts of light penetrating the mangrove canopy Swarms can be created in the laboratory within light shafts created with a fiber optic light pipe. Laboratory observations of swarming behavior were recorded using video cameras, and the swimming behavior of the copepods and density of the swarms were quantified using video-computer motion and image analysis techniques. Swarm formation results from a combination of phototactic and klino-kinetic behavior Dark adapted copepods initially exhibit a photophobic response to a light shaft, but become positively phototactic within 3-5 min after exposure to the light. Copepod aggregation rates under the light fit a saturation model, suggesting that copepods are attracted independently to the swarm marker. Copepods reverse their swimming direction when they encounter light intensity gradients near the edge of a light shaft, which aids in maintaining the swarm. Swarm formation can occur in the laboratory at light intensities as slow as 0.1 mu M photons m(-2) s(-1),which is similar to light intensities at dawn when they are first observed to form in nature. Swarm formation appears to have an endogenous rhythm, as copepods will not form swarms at night under a light shaft.