Department of Biology

Aarhus University Seal / Aarhus Universitets segl

Peter Funch

Contraction-Expansion and the Effects on the Aquiferous System in the Demosponge Halichondria panicea

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Contraction-Expansion and the Effects on the Aquiferous System in the Demosponge Halichondria panicea. / Goldstein, Josephine; Bisbo, Nicklas; Funch, Peter et al.

In: Frontiers in Marine Science, Vol. 7, 113, 2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Goldstein, Josephine ; Bisbo, Nicklas ; Funch, Peter et al. / Contraction-Expansion and the Effects on the Aquiferous System in the Demosponge Halichondria panicea. In: Frontiers in Marine Science. 2020 ; Vol. 7.

Bibtex

@article{f002c7ac5db140e08e64a0c15d9e198b,
title = "Contraction-Expansion and the Effects on the Aquiferous System in the Demosponge Halichondria panicea",
abstract = "Contractile behavior is common among sponges despite their lack of nerves and muscles. As sessile filter-feeders, sponges rely on water with suspended food particles being pumped through their aquiferous system. During contractions, however, the water flow is being reduced and eventually shut down. Yet, purpose and underlying pathways of contractile behavior have remained largely unclear. Here, we document the external and internal morphology of contracted and expanded single-osculum explants of the demosponge Halichondria panicea. We show that contraction-expansion dynamics can occur spontaneously (in untreated explants) and can be induced by exposure to chemical messengers such as γ-aminobutyric acid (GABA, 1 mM) and L-glutamate (L-Glu, 1 mM), or to inedible ink particles (4 mg L–1). The neurotransmitter GABA triggered similar contraction-expansion dynamics in H. panicea as observed in untreated explants. The effects of GABA-induced contraction-expansion events on the aquiferous system were investigated using scanning electron microscopy (SEM) on cryofractured explants. Our findings suggest that contraction-expansion affects the entire aquiferous system of H. panicea, including osculum, ostia, in- and excurrent canals and apopyles.",
keywords = "aquiferous system, chemical messengers, contraction, functional morphology, inedible particles, marine demosponge, SEM",
author = "Josephine Goldstein and Nicklas Bisbo and Peter Funch and Riisg{\aa}rd, {Hans Ulrik}",
year = "2020",
doi = "10.3389/fmars.2020.00113",
language = "English",
volume = "7",
journal = "Frontiers in Marine Science",
issn = "2296-7745",
publisher = "Frontiers Media S.A.",

}

RIS

TY - JOUR

T1 - Contraction-Expansion and the Effects on the Aquiferous System in the Demosponge Halichondria panicea

AU - Goldstein, Josephine

AU - Bisbo, Nicklas

AU - Funch, Peter

AU - Riisgård, Hans Ulrik

PY - 2020

Y1 - 2020

N2 - Contractile behavior is common among sponges despite their lack of nerves and muscles. As sessile filter-feeders, sponges rely on water with suspended food particles being pumped through their aquiferous system. During contractions, however, the water flow is being reduced and eventually shut down. Yet, purpose and underlying pathways of contractile behavior have remained largely unclear. Here, we document the external and internal morphology of contracted and expanded single-osculum explants of the demosponge Halichondria panicea. We show that contraction-expansion dynamics can occur spontaneously (in untreated explants) and can be induced by exposure to chemical messengers such as γ-aminobutyric acid (GABA, 1 mM) and L-glutamate (L-Glu, 1 mM), or to inedible ink particles (4 mg L–1). The neurotransmitter GABA triggered similar contraction-expansion dynamics in H. panicea as observed in untreated explants. The effects of GABA-induced contraction-expansion events on the aquiferous system were investigated using scanning electron microscopy (SEM) on cryofractured explants. Our findings suggest that contraction-expansion affects the entire aquiferous system of H. panicea, including osculum, ostia, in- and excurrent canals and apopyles.

AB - Contractile behavior is common among sponges despite their lack of nerves and muscles. As sessile filter-feeders, sponges rely on water with suspended food particles being pumped through their aquiferous system. During contractions, however, the water flow is being reduced and eventually shut down. Yet, purpose and underlying pathways of contractile behavior have remained largely unclear. Here, we document the external and internal morphology of contracted and expanded single-osculum explants of the demosponge Halichondria panicea. We show that contraction-expansion dynamics can occur spontaneously (in untreated explants) and can be induced by exposure to chemical messengers such as γ-aminobutyric acid (GABA, 1 mM) and L-glutamate (L-Glu, 1 mM), or to inedible ink particles (4 mg L–1). The neurotransmitter GABA triggered similar contraction-expansion dynamics in H. panicea as observed in untreated explants. The effects of GABA-induced contraction-expansion events on the aquiferous system were investigated using scanning electron microscopy (SEM) on cryofractured explants. Our findings suggest that contraction-expansion affects the entire aquiferous system of H. panicea, including osculum, ostia, in- and excurrent canals and apopyles.

KW - aquiferous system

KW - chemical messengers

KW - contraction

KW - functional morphology

KW - inedible particles

KW - marine demosponge

KW - SEM

UR - http://www.scopus.com/inward/record.url?scp=85082419704&partnerID=8YFLogxK

U2 - 10.3389/fmars.2020.00113

DO - 10.3389/fmars.2020.00113

M3 - Journal article

AN - SCOPUS:85082419704

VL - 7

JO - Frontiers in Marine Science

JF - Frontiers in Marine Science

SN - 2296-7745

M1 - 113

ER -