Rhythms at the bottom of the deep sea

Cyclic current flow changes and melatonin patterns in two species of demersal fish

H. -J. Wagner, Kirsty Megan Kemp, U. Mattheus, I. G. Priede

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We have studied physical and biological rhythms in the deep demersal habitat of the Northeastern Atlantic. Current velocity and direction changes occurred at intervals of 12.4 h, demonstrating that they could have an impact of tidal activity, and also showed indications of other seasonal changes. As an indicator of biological rhythms, we measured the content of pineal and retinal melatonin in the grenadier Coryphaenoides armatus and the deep-sea eel Synaphobranchus kaupii, and determined the spontaneous release of melatonin in long-term (52 h minimum) cultures of isolated pineal organs and retinae in S. kaupii. The results of the release experiments show statistically significant signs of synchronicity and periodicity suggesting the presence of an endogenous clock. The melatonin content data show large error bars typical of cross-sectional population studies. When the data are plotted according to a lunar cycle, taken as indication of a tidal rhythm, both species show peak values at the beginning of the lunar day and night and lower values during the second half of lunar day and night and during moonrise and moonset. Statistical analysis, however.. shows that the periodicity of the melatonin content is not significant. Taken together these observations strongly suggest that (1) biological rhythms are present in demersal fish, (2) the melatonin metabolism shows signs of periodicity, and (3) tidal currents may act as zeitgeber at the bottom of the deep sea.

Original languageEnglish
Pages (from-to)1944-1956
Number of pages13
JournalDeep Sea Research Part I: Oceanographic Research Papers
Volume54
Issue number11
DOIs
Publication statusPublished - Nov 2007

Keywords

  • tidal and seasonal current changes
  • pineal melatonin
  • retinal melatonin
  • Synaphobranchus kaupii
  • Coryphaenoides armatus
  • tidal currents
  • pineal organs
  • circadian rhythmicity
  • North-Atlantic
  • retina
  • light
  • photoreceptors
  • release
  • Biscay
  • slope

Cite this

Rhythms at the bottom of the deep sea : Cyclic current flow changes and melatonin patterns in two species of demersal fish. / Wagner, H. -J.; Kemp, Kirsty Megan; Mattheus, U.; Priede, I. G.

In: Deep Sea Research Part I: Oceanographic Research Papers, Vol. 54, No. 11, 11.2007, p. 1944-1956.

Research output: Contribution to journalArticle

@article{efc796d573e7476dab8b68494a25ea36,
title = "Rhythms at the bottom of the deep sea: Cyclic current flow changes and melatonin patterns in two species of demersal fish",
abstract = "We have studied physical and biological rhythms in the deep demersal habitat of the Northeastern Atlantic. Current velocity and direction changes occurred at intervals of 12.4 h, demonstrating that they could have an impact of tidal activity, and also showed indications of other seasonal changes. As an indicator of biological rhythms, we measured the content of pineal and retinal melatonin in the grenadier Coryphaenoides armatus and the deep-sea eel Synaphobranchus kaupii, and determined the spontaneous release of melatonin in long-term (52 h minimum) cultures of isolated pineal organs and retinae in S. kaupii. The results of the release experiments show statistically significant signs of synchronicity and periodicity suggesting the presence of an endogenous clock. The melatonin content data show large error bars typical of cross-sectional population studies. When the data are plotted according to a lunar cycle, taken as indication of a tidal rhythm, both species show peak values at the beginning of the lunar day and night and lower values during the second half of lunar day and night and during moonrise and moonset. Statistical analysis, however.. shows that the periodicity of the melatonin content is not significant. Taken together these observations strongly suggest that (1) biological rhythms are present in demersal fish, (2) the melatonin metabolism shows signs of periodicity, and (3) tidal currents may act as zeitgeber at the bottom of the deep sea.",
keywords = "tidal and seasonal current changes, pineal melatonin, retinal melatonin, Synaphobranchus kaupii, Coryphaenoides armatus, tidal currents, pineal organs, circadian rhythmicity, North-Atlantic, retina, light, photoreceptors, release, Biscay, slope",
author = "Wagner, {H. -J.} and Kemp, {Kirsty Megan} and U. Mattheus and Priede, {I. G.}",
year = "2007",
month = "11",
doi = "10.1016/j.dsr.2007.08.005",
language = "English",
volume = "54",
pages = "1944--1956",
journal = "Deep Sea Research Part I: Oceanographic Research Papers",
issn = "0967-0637",
publisher = "Elsevier Limited",
number = "11",

}

TY - JOUR

T1 - Rhythms at the bottom of the deep sea

T2 - Cyclic current flow changes and melatonin patterns in two species of demersal fish

AU - Wagner, H. -J.

AU - Kemp, Kirsty Megan

AU - Mattheus, U.

AU - Priede, I. G.

PY - 2007/11

Y1 - 2007/11

N2 - We have studied physical and biological rhythms in the deep demersal habitat of the Northeastern Atlantic. Current velocity and direction changes occurred at intervals of 12.4 h, demonstrating that they could have an impact of tidal activity, and also showed indications of other seasonal changes. As an indicator of biological rhythms, we measured the content of pineal and retinal melatonin in the grenadier Coryphaenoides armatus and the deep-sea eel Synaphobranchus kaupii, and determined the spontaneous release of melatonin in long-term (52 h minimum) cultures of isolated pineal organs and retinae in S. kaupii. The results of the release experiments show statistically significant signs of synchronicity and periodicity suggesting the presence of an endogenous clock. The melatonin content data show large error bars typical of cross-sectional population studies. When the data are plotted according to a lunar cycle, taken as indication of a tidal rhythm, both species show peak values at the beginning of the lunar day and night and lower values during the second half of lunar day and night and during moonrise and moonset. Statistical analysis, however.. shows that the periodicity of the melatonin content is not significant. Taken together these observations strongly suggest that (1) biological rhythms are present in demersal fish, (2) the melatonin metabolism shows signs of periodicity, and (3) tidal currents may act as zeitgeber at the bottom of the deep sea.

AB - We have studied physical and biological rhythms in the deep demersal habitat of the Northeastern Atlantic. Current velocity and direction changes occurred at intervals of 12.4 h, demonstrating that they could have an impact of tidal activity, and also showed indications of other seasonal changes. As an indicator of biological rhythms, we measured the content of pineal and retinal melatonin in the grenadier Coryphaenoides armatus and the deep-sea eel Synaphobranchus kaupii, and determined the spontaneous release of melatonin in long-term (52 h minimum) cultures of isolated pineal organs and retinae in S. kaupii. The results of the release experiments show statistically significant signs of synchronicity and periodicity suggesting the presence of an endogenous clock. The melatonin content data show large error bars typical of cross-sectional population studies. When the data are plotted according to a lunar cycle, taken as indication of a tidal rhythm, both species show peak values at the beginning of the lunar day and night and lower values during the second half of lunar day and night and during moonrise and moonset. Statistical analysis, however.. shows that the periodicity of the melatonin content is not significant. Taken together these observations strongly suggest that (1) biological rhythms are present in demersal fish, (2) the melatonin metabolism shows signs of periodicity, and (3) tidal currents may act as zeitgeber at the bottom of the deep sea.

KW - tidal and seasonal current changes

KW - pineal melatonin

KW - retinal melatonin

KW - Synaphobranchus kaupii

KW - Coryphaenoides armatus

KW - tidal currents

KW - pineal organs

KW - circadian rhythmicity

KW - North-Atlantic

KW - retina

KW - light

KW - photoreceptors

KW - release

KW - Biscay

KW - slope

U2 - 10.1016/j.dsr.2007.08.005

DO - 10.1016/j.dsr.2007.08.005

M3 - Article

VL - 54

SP - 1944

EP - 1956

JO - Deep Sea Research Part I: Oceanographic Research Papers

JF - Deep Sea Research Part I: Oceanographic Research Papers

SN - 0967-0637

IS - 11

ER -