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Swim pacemakers in box jellyfish are modulated by the visual input.

Garm, Anders LU and Bielecki, J (2008) In Journal of Comparative Physiology A 194(7). p.641-651
Abstract
A major part of the cubozoan central nervous system is situated in the eye-bearing rhopalia. One of the neuronal output channels from the rhopalia carries a swim pacemaker signal, which has a one-to-one relation with the swim contractions of the bell shaped body. Given the advanced visual system of box jellyfish and that the pacemaker signal originates in the vicinity of these eyes, it seems logical to assume that the pacemakers are modified by the visual input. Here, the firing frequency and distribution of inter-signal intervals (ISIs) of single pacemakers are examined in the Caribbean box jellyfish, Tripedalia cystophora. It is shown that the absolute ambient light intensity, if kept constant, has no influence on the signal, but if the... (More)
A major part of the cubozoan central nervous system is situated in the eye-bearing rhopalia. One of the neuronal output channels from the rhopalia carries a swim pacemaker signal, which has a one-to-one relation with the swim contractions of the bell shaped body. Given the advanced visual system of box jellyfish and that the pacemaker signal originates in the vicinity of these eyes, it seems logical to assume that the pacemakers are modified by the visual input. Here, the firing frequency and distribution of inter-signal intervals (ISIs) of single pacemakers are examined in the Caribbean box jellyfish, Tripedalia cystophora. It is shown that the absolute ambient light intensity, if kept constant, has no influence on the signal, but if the intensity changes, it has a major impact on both frequency and ISIs. If the intensity suddenly drops there is an increase in firing frequency, and the ISIs become more homogeneously distributed. A rise in intensity, on the other hand, produces a steep decline in the frequency and makes the ISIs highly variable. These electrophysiological data are correlated with behavioral observations from the natural habitat of the medusae. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Swim pacemaker - Cubomedusae - Vision - Inter-signal interval - Firing frequency
in
Journal of Comparative Physiology A
volume
194
issue
7
pages
641 - 651
publisher
Springer
external identifiers
  • wos:000257374400005
  • pmid:18446348
  • scopus:46649104055
ISSN
1432-1351
DOI
10.1007/s00359-008-0336-0
language
English
LU publication?
yes
id
b5d720df-6939-4e63-b543-eea22220580b (old id 1154664)
date added to LUP
2008-10-22 14:12:10
date last changed
2017-03-12 03:52:48
@article{b5d720df-6939-4e63-b543-eea22220580b,
  abstract     = {A major part of the cubozoan central nervous system is situated in the eye-bearing rhopalia. One of the neuronal output channels from the rhopalia carries a swim pacemaker signal, which has a one-to-one relation with the swim contractions of the bell shaped body. Given the advanced visual system of box jellyfish and that the pacemaker signal originates in the vicinity of these eyes, it seems logical to assume that the pacemakers are modified by the visual input. Here, the firing frequency and distribution of inter-signal intervals (ISIs) of single pacemakers are examined in the Caribbean box jellyfish, Tripedalia cystophora. It is shown that the absolute ambient light intensity, if kept constant, has no influence on the signal, but if the intensity changes, it has a major impact on both frequency and ISIs. If the intensity suddenly drops there is an increase in firing frequency, and the ISIs become more homogeneously distributed. A rise in intensity, on the other hand, produces a steep decline in the frequency and makes the ISIs highly variable. These electrophysiological data are correlated with behavioral observations from the natural habitat of the medusae.},
  author       = {Garm, Anders and Bielecki, J},
  issn         = {1432-1351},
  keyword      = {Swim pacemaker - Cubomedusae - Vision - Inter-signal interval - Firing frequency},
  language     = {eng},
  number       = {7},
  pages        = {641--651},
  publisher    = {Springer},
  series       = {Journal of Comparative Physiology A},
  title        = {Swim pacemakers in box jellyfish are modulated by the visual input.},
  url          = {http://dx.doi.org/10.1007/s00359-008-0336-0},
  volume       = {194},
  year         = {2008},
}