Vision in lanternfish (Myctophidae): Adaptations for viewing bioluminescence in the deep-sea
Turner, J.R.; White, E.M.; Collins, Martin Anthony; Partridge, J.C.; Douglas, R.H.. 2009 Vision in lanternfish (Myctophidae): Adaptations for viewing bioluminescence in the deep-sea. Deep Sea Research I, 56 (6). 1003-1017. 10.1016/j.dsr.2009.01.007Full text not available from this repository.
The sensitivity hypothesis seeks to explain the correlation between the wavelength of visual pigment absorption maxima (lambda(max)) and habitat type in fish and other marine animals in terms of the maximisation of photoreceptor photon catch. In recent years its legitimacy has been called into question as studies have either not tested data against the output of a predictive model or are confounded by the wide phylogeny of species used. We have addressed these issues by focussing on the distribution of lambda(max) values in one family of marine teleosts, the lanternfish (Myctophidae). Visual pigment extract spectrophotometry has shown that 54 myctophid species have a single pigment in their retinae with a lambda(max) falling within the range 480-492 rim. A further 4 species contain two visual pigments in their retinae. The spectral distribution of these visual pigments seems relatively confined when compared to other mesopelagic fishes. Mathematical modelling based on the assumptions of the sensitivity hypothesis shows that, contrary to the belief that deep-sea fishes' visual pigments are shortwave shifted to maximise their sensitivity to downwelling sunlight, the visual pigments of myctophids instead seem better placed for the visualisation of bioluminescence. The predicted maximum visualisation distance of a blue/green bioluminescent point source by a myctophid was up to 30 m under ideal conditions. Two species (Myctophum nitidulum and Bolinichthys longipes) have previously been shown to have longwave-shifted spectral sensitivities and we show that they could theoretically detect stomiid far-red bioluminescence from as far as ca. 7 m. (C) 2009 Elsevier Ltd. All rights reserved.
|Programmes:||BAS Programmes > Global Science in the Antarctic Context (2005-2009) > DISCOVERY 2010 - Integrating Southern Ocean Ecosystems into the Earth System|
|Additional Keywords:||Visual pigments; Bioluminescence; Lanternfish; Myctophidae; Spectral sensitivity; Visualisation distance|
|NORA Subject Terms:||Marine Sciences
Biology and Microbiology
Ecology and Environment
|Date made live:||15 Nov 2010 13:19|
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