Colour vision and response bias in a coral reef fish
Colour vision and response bias in a coral reef fish
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DOI：
10.1242/jeb.087932
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发表时间：
2013-08-01
影响因子：
2.8
通讯作者：
Marshall, N. Justin
中科院分区：
文献类型：
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作者：
Cheney, Karen L.;Newport, Cait;Marshall, N. Justin
动物利用彩色信号进行各种各样的交流，包括吸引潜在的配偶、识别个体、保卫领土和警告捕食者二级防御（警告）。为了理解驱动这些视觉信号进化和设计的机制，了解信号接收器的视觉系统和潜在的响应偏差是很重要的。在这里，我们提供了一种珊瑚鱼的光谱能力的原始数据，毕加索触发器鱼Rhinecanthus aculeatus，它是三色的，有三个锥体灵敏度分别为413 nm（单锥体），480 nm（双锥体，中等灵敏度）和528 nm（双锥体，长灵敏度），杆状灵敏度为498 nm。眼介质在405 nm处有50%的透射切断。行为实验证实了它们在光谱范围内的色觉；无论亮度如何，触发鱼明显更倾向于选择彩色刺激物，而不是灰色刺激物。然后，我们研究了对彩色和图案刺激的反应偏差是否存在，以深入了解视觉信号——特别是警示性颜色——是如何演变的。与蓝色和黄色刺激相比，触发鱼对红色和绿色刺激表现出优先的觅食反应偏好，与模式无关。与单色非图案刺激相比，有图案刺激没有反应偏倚。鱼类对红色的觅食反应偏好与鸟类捕食者不同，后者通常会避开红色食物。红色通常与陆地环境中的警告色（瓢虫、蛇、青蛙）联系在一起，而蓝色则用于水生环境（蓝环章鱼、裸鳃动物）；警告（警示性）显示的设计是反应偏差的原因还是结果尚不清楚。
Animals use coloured signals for a variety of communication purposes, including to attract potential mates, recognize individuals, defend territories and warn predators of secondary defences (aposematism). To understand the mechanisms that drive the evolution and design of such visual signals, it is important to understand the visual systems and potential response biases of signal receivers. Here, we provide raw data on the spectral capabilities of a coral reef fish, the Picasso triggerfish Rhinecanthus aculeatus, which is potentially trichromatic with three cone sensitivities of 413 nm (single cone), 480 nm (double cone, medium sensitivity) and 528 nm (double cone, long sensitivity), and a rod sensitivity of 498 nm. The ocular media have a 50% transmission cut off at 405 nm. Behavioural experiments confirmed colour vision over their spectral range; triggerfish were significantly more likely to choose coloured stimuli over grey distractors, irrespective of luminance. We then examined whether response biases existed towards coloured and patterned stimuli to provide insight into how visual signals - in particular, aposematic colouration - may evolve. Triggerfish showed a preferential foraging response bias to red and green stimuli, in contrast to blue and yellow, irrespective of pattern. There was no response bias to patterned over monochromatic non-patterned stimuli. A foraging response bias towards red in fish differs from that of avian predators, who often avoid red food items. Red is frequently associated with warning colouration in terrestrial environments (ladybirds, snakes, frogs), whilst blue is used in aquatic environments (blue-ringed octopus, nudibranchs); whether the design of warning (aposematic) displays is a cause or consequence of response biases is unclear.