Nocturnality constrains morphological and functional diversity in the eyes of reef fishes

BMC Evolutionary Biology

Peter C Wainwright¹  Lars Schmitz² 

[1] Center for Population Biology, University of California, Davis, CA, 95616, USA;Department of Evolution and Ecology, University of California, Davis, CA, 95616, USA

Others  :  1142164
DOI  :  10.1186/1471-2148-11-338

 received in 2011-09-16, accepted in 2011-11-19,  发布年份 2011

【 摘 要 】

Background

Ambient light levels are often considered to drive the evolution of eye form and function. Diel activity pattern is the main mechanism controlling the visual environment of teleost reef fish, with day-active (diurnal) fish active in well-illuminated conditions, whereas night-active (nocturnal) fish cope with dim light. Physiological optics predicts several specific evolutionary responses to dim-light vision that should be reflected in visual performance features of the eye.

Results

We analyzed a large comparative dataset on morphological traits of the eyes in 265 species of teleost reef fish in 43 different families. The eye morphology of nocturnal reef teleosts is characterized by a syndrome that indicates better light sensitivity, including large relative eye size, high optical ratio and large, rounded pupils. Improved dim-light image formation comes at the cost of reduced depth of focus and reduction of potential accommodative lens movement. Diurnal teleost reef fish, released from the stringent functional requirements of dim-light vision have much higher morphological and optical diversity than nocturnal species, with large ranges of optical ratio, depth of focus, and lens accommodation.

Conclusions

Physical characteristics of the environment are an important factor in the evolution and diversification of the vertebrate eye. Both teleost reef fish and terrestrial amniotes meet the functional requirements of dim-light vision with a similar evolutionary response of morphological and optical modifications. The trade-off between improved dim-light vision and reduced optical diversity may be a key factor in explaining the lower trophic diversity of nocturnal reef teleosts.

【 授权许可】

   
2011 Schmitz and Wainwright; licensee BioMed Central Ltd.

【 图 表 】

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