The contraction-expansion behaviour in the demosponge Tethya wilhelma is light controlled and follows a diurnal rhythm
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The contraction-expansion behaviour in the demosponge Tethya wilhelma is light controlled and follows a diurnal rhythm. / Flensburg, Sarah B.; Garm, Anders; Funch, Peter.
In: Journal of Experimental Biology, Vol. 225, No. 24, 244751, 2022.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - The contraction-expansion behaviour in the demosponge Tethya wilhelma is light controlled and follows a diurnal rhythm
AU - Flensburg, Sarah B.
AU - Garm, Anders
AU - Funch, Peter
PY - 2022
Y1 - 2022
N2 - Sponges (phylum Porifera) are metazoans which lack muscles and nerve cells, yet perform coordinated behaviours such as whole-body contractions. Previous studies indicate diurnal variability in both the number of contractions and the expression of circadian clock genes. Here, we show that diurnal patterns are present in the contraction-expansion behaviour of the demosponge Tethya wilhelma, by using infrared videography and a simulated night/day cycle including sunrise and sunset mimics. In addition, we show that this behaviour is at least strongly influenced by ambient light intensity and therefore indicates light-sensing capabilities in this sponge species. This is supported by our finding that T. wilhelma consistently contracts at sunrise, and that this pattern disappears both when the sponge is kept in constant darkness and when it is in constant light.
AB - Sponges (phylum Porifera) are metazoans which lack muscles and nerve cells, yet perform coordinated behaviours such as whole-body contractions. Previous studies indicate diurnal variability in both the number of contractions and the expression of circadian clock genes. Here, we show that diurnal patterns are present in the contraction-expansion behaviour of the demosponge Tethya wilhelma, by using infrared videography and a simulated night/day cycle including sunrise and sunset mimics. In addition, we show that this behaviour is at least strongly influenced by ambient light intensity and therefore indicates light-sensing capabilities in this sponge species. This is supported by our finding that T. wilhelma consistently contracts at sunrise, and that this pattern disappears both when the sponge is kept in constant darkness and when it is in constant light.
KW - Porifera
KW - Pre-nervous system
KW - Light reception
KW - Behavioural control
KW - Diurnal rhythmicity
KW - INTERTIDAL SPONGE
KW - NERVOUS-SYSTEM
KW - RELEASE
KW - GLUTAMATE
KW - DYNAMICS
KW - PORIFERA
KW - SIGNAL
KW - GABA
U2 - 10.1242/jeb.244751
DO - 10.1242/jeb.244751
M3 - Letter
C2 - 36546534
VL - 225
JO - Journal of Experimental Biology
JF - Journal of Experimental Biology
SN - 0022-0949
IS - 24
M1 - 244751
ER -
ID: 338532648