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Iso-luminance counterillumination drove bioluminescent shark radiation.

Claes, Julien M; Nilsson, Dan-E LU ; Straube, Nicolas; Collin, Shaun P and Mallefet, Jérôme (2014) In Scientific Reports 4.
Abstract
Counterilluminating animals use ventral photogenic organs (photophores) to mimic the residual downwelling light and cloak their silhouette from upward-looking predators. To cope with variable conditions of pelagic light environments they typically adjust their luminescence intensity. Here, we found evidence that bioluminescent sharks instead emit a constant light output and move up and down in the water column to remain cryptic at iso-luminance depth. We observed, across 21 globally distributed shark species, a correlation between capture depth and the proportion of a ventral area occupied by photophores. This information further allowed us, using visual modelling, to provide an adaptive explanation for shark photophore pattern diversity:... (More)
Counterilluminating animals use ventral photogenic organs (photophores) to mimic the residual downwelling light and cloak their silhouette from upward-looking predators. To cope with variable conditions of pelagic light environments they typically adjust their luminescence intensity. Here, we found evidence that bioluminescent sharks instead emit a constant light output and move up and down in the water column to remain cryptic at iso-luminance depth. We observed, across 21 globally distributed shark species, a correlation between capture depth and the proportion of a ventral area occupied by photophores. This information further allowed us, using visual modelling, to provide an adaptive explanation for shark photophore pattern diversity: in species facing moderate predation risk from below, counterilluminating photophores were partially co-opted for bioluminescent signalling, leading to complex patterns. In addition to increase our understanding of pelagic ecosystems our study emphasizes the importance of bioluminescence as a speciation driver. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
4
publisher
Nature Publishing Group
external identifiers
  • pmid:24608897
  • wos:000332452700002
  • scopus:84905467933
ISSN
2045-2322
DOI
10.1038/srep04328
language
English
LU publication?
yes
id
e8699ac0-b916-4cef-b17a-ef7071567397 (old id 4383636)
date added to LUP
2014-04-25 09:39:35
date last changed
2017-02-26 03:55:55
@article{e8699ac0-b916-4cef-b17a-ef7071567397,
  abstract     = {Counterilluminating animals use ventral photogenic organs (photophores) to mimic the residual downwelling light and cloak their silhouette from upward-looking predators. To cope with variable conditions of pelagic light environments they typically adjust their luminescence intensity. Here, we found evidence that bioluminescent sharks instead emit a constant light output and move up and down in the water column to remain cryptic at iso-luminance depth. We observed, across 21 globally distributed shark species, a correlation between capture depth and the proportion of a ventral area occupied by photophores. This information further allowed us, using visual modelling, to provide an adaptive explanation for shark photophore pattern diversity: in species facing moderate predation risk from below, counterilluminating photophores were partially co-opted for bioluminescent signalling, leading to complex patterns. In addition to increase our understanding of pelagic ecosystems our study emphasizes the importance of bioluminescence as a speciation driver.},
  articleno    = {4328},
  author       = {Claes, Julien M and Nilsson, Dan-E and Straube, Nicolas and Collin, Shaun P and Mallefet, Jérôme},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Iso-luminance counterillumination drove bioluminescent shark radiation.},
  url          = {http://dx.doi.org/10.1038/srep04328},
  volume       = {4},
  year         = {2014},
}