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Night sky orientation with diurnal and nocturnal eyes: dim-light adaptations are critical when the moon is out of sight

Smolka, Jochen LU ; Baird, Emily LU ; el Jundi, Basil LU ; Reber, Therese LU ; Byrne, Marcus J. and Dacke, Marie LU (2016) In Animal Behaviour 111. p.127-146
Abstract
The visual systems of many animals feature energetically costly specializations to enable them to function in dim light. It is often unclear, however, how large the behavioural benefit of these specializations is, because a direct comparison in a behaviourally relevant task between closely related day- and night-active species is not usually possible. Here we compared the orientation performance of diurnal and nocturnal species of dung beetles, Scarabaeus (Kheper) lamarcki and Scarabaeus satyrus, respectively, attempting to roll dung balls along straight paths both during the day and at night. Using video tracking, we quantified the straightness of paths and the repeatability of roll bearings as beetles exited a flat arena in their natural... (More)
The visual systems of many animals feature energetically costly specializations to enable them to function in dim light. It is often unclear, however, how large the behavioural benefit of these specializations is, because a direct comparison in a behaviourally relevant task between closely related day- and night-active species is not usually possible. Here we compared the orientation performance of diurnal and nocturnal species of dung beetles, Scarabaeus (Kheper) lamarcki and Scarabaeus satyrus, respectively, attempting to roll dung balls along straight paths both during the day and at night. Using video tracking, we quantified the straightness of paths and the repeatability of roll bearings as beetles exited a flat arena in their natural habitat or under controlled conditions indoors. Both species oriented equally well when either the moon or an artificial point light source was available, but when the view of the moon was

blocked and only wide-field cues such as the lunar polarization pattern or the stars were available for orientation, nocturnal beetles were oriented substantially better. We found no evidence that ball-rolling speed changed with light level, which suggests little or no temporal summation in the visual system. Finally, we found that both diurnal and nocturnal beetles tended to choose bearings that led them towards a bright light source, but away from a dim one. Our results show that even diurnal insects, at least those with superposition eyes, could orient by the light of the moon, but that dim-light adaptations are needed for precise orientation when the moon is not visible. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dung beetle, insect, Milky Way, nocturnal adaptation, polarized moonlight, sky compass, straight-line orientation, vision
in
Animal Behaviour
volume
111
pages
127 - 146
publisher
Elsevier
external identifiers
  • wos:000367374000017
  • scopus:84946837773
ISSN
1095-8282
DOI
10.1016/j.anbehav.2015.10.005
language
English
LU publication?
yes
id
9172cdea-da63-4056-9de4-30ce3c29fe4d (old id 8258143)
date added to LUP
2015-12-08 13:33:33
date last changed
2017-11-17 00:01:00
@article{9172cdea-da63-4056-9de4-30ce3c29fe4d,
  abstract     = {The visual systems of many animals feature energetically costly specializations to enable them to function in dim light. It is often unclear, however, how large the behavioural benefit of these specializations is, because a direct comparison in a behaviourally relevant task between closely related day- and night-active species is not usually possible. Here we compared the orientation performance of diurnal and nocturnal species of dung beetles, Scarabaeus (Kheper) lamarcki and Scarabaeus satyrus, respectively, attempting to roll dung balls along straight paths both during the day and at night. Using video tracking, we quantified the straightness of paths and the repeatability of roll bearings as beetles exited a flat arena in their natural habitat or under controlled conditions indoors. Both species oriented equally well when either the moon or an artificial point light source was available, but when the view of the moon was<br/><br>
blocked and only wide-field cues such as the lunar polarization pattern or the stars were available for orientation, nocturnal beetles were oriented substantially better. We found no evidence that ball-rolling speed changed with light level, which suggests little or no temporal summation in the visual system. Finally, we found that both diurnal and nocturnal beetles tended to choose bearings that led them towards a bright light source, but away from a dim one. Our results show that even diurnal insects, at least those with superposition eyes, could orient by the light of the moon, but that dim-light adaptations are needed for precise orientation when the moon is not visible.},
  author       = {Smolka, Jochen and Baird, Emily and el Jundi, Basil and Reber, Therese and Byrne, Marcus J. and Dacke, Marie},
  issn         = {1095-8282},
  keyword      = {dung beetle,insect,Milky Way,nocturnal adaptation,polarized moonlight,sky compass,straight-line orientation,vision},
  language     = {eng},
  pages        = {127--146},
  publisher    = {Elsevier},
  series       = {Animal Behaviour},
  title        = {Night sky orientation with diurnal and nocturnal eyes: dim-light adaptations are critical when the moon is out of sight},
  url          = {http://dx.doi.org/10.1016/j.anbehav.2015.10.005},
  volume       = {111},
  year         = {2016},
}