Osculum dynamics and filtration activity in small single-osculum explants of the demosponge Halichondria panicea

Lars Kumala*, Hans Ulrik Riisgård, Donald Eugene Canfield

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Resumé

Contraction-inflation behavior, including the closure and opening of the exhalant opening (osculum), is common among sponges. This behavior may temporally affect filtration activity, making it difficult to study and understand sponge feeding biology. To examine the interplay between osculum dynamics and filtration activity, small (18 mm3) single-osculum explants of the demosponge Halichondria panicea were studied. Time-lapse video stereo-microscope recordings of the osculum cross-sectional area (OSA) were made simultaneously with measurements of the filtration rate (∼15°C, ∼20 PSU) using the clearance method. Osculum dynamics, as expressed by temporal variation of the OSA, including osculum contraction and expansion, correlated with variability in the explant filtration rate, and no water pumping was observed during periods of osculum closure. A linear relationship between filtration rate (FR) and OSA revealed a constant exhalant jet velocity: vjet = FR/OSA = 2.3 ± CI95% 0.13 cm s-1. The mean filtration rate of explants was 0.28 ± CI95% 0.06 ml min-1, corresponding to a volume-specific filtration rate of 15 ml min-1 (cm3 sponge)-1, which is 2 to 3 times higher than that reported for larger individuals of H. panicea with multiple oscula. This is the first demonstration of a direct relationship between filter feeding and osculum dynamics in a sponge.

OriginalsprogEngelsk
TidsskriftMarine Ecology - Progress Series
Vol/bind572
Sider (fra-til)117-128
ISSN0171-8630
DOI
StatusUdgivet - 2017

Fingeraftryk

explants
sponge
contraction
filter feeding
inflation
microscopes
temporal variation
rate
pumping
Biological Sciences
water

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title = "Osculum dynamics and filtration activity in small single-osculum explants of the demosponge Halichondria panicea",
abstract = "Contraction-inflation behavior, including the closure and opening of the exhalant opening (osculum), is common among sponges. This behavior may temporally affect filtration activity, making it difficult to study and understand sponge feeding biology. To examine the interplay between osculum dynamics and filtration activity, small (18 mm3) single-osculum explants of the demosponge Halichondria panicea were studied. Time-lapse video stereo-microscope recordings of the osculum cross-sectional area (OSA) were made simultaneously with measurements of the filtration rate (∼15°C, ∼20 PSU) using the clearance method. Osculum dynamics, as expressed by temporal variation of the OSA, including osculum contraction and expansion, correlated with variability in the explant filtration rate, and no water pumping was observed during periods of osculum closure. A linear relationship between filtration rate (FR) and OSA revealed a constant exhalant jet velocity: vjet = FR/OSA = 2.3 ± CI95{\%} 0.13 cm s-1. The mean filtration rate of explants was 0.28 ± CI95{\%} 0.06 ml min-1, corresponding to a volume-specific filtration rate of 15 ml min-1 (cm3 sponge)-1, which is 2 to 3 times higher than that reported for larger individuals of H. panicea with multiple oscula. This is the first demonstration of a direct relationship between filter feeding and osculum dynamics in a sponge.",
keywords = "Contraction, Filtration, Osculum, Pumping activity, Sponge explant",
author = "Lars Kumala and Riisg{\aa}rd, {Hans Ulrik} and Canfield, {Donald Eugene}",
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T1 - Osculum dynamics and filtration activity in small single-osculum explants of the demosponge Halichondria panicea

AU - Kumala, Lars

AU - Riisgård, Hans Ulrik

AU - Canfield, Donald Eugene

PY - 2017

Y1 - 2017

N2 - Contraction-inflation behavior, including the closure and opening of the exhalant opening (osculum), is common among sponges. This behavior may temporally affect filtration activity, making it difficult to study and understand sponge feeding biology. To examine the interplay between osculum dynamics and filtration activity, small (18 mm3) single-osculum explants of the demosponge Halichondria panicea were studied. Time-lapse video stereo-microscope recordings of the osculum cross-sectional area (OSA) were made simultaneously with measurements of the filtration rate (∼15°C, ∼20 PSU) using the clearance method. Osculum dynamics, as expressed by temporal variation of the OSA, including osculum contraction and expansion, correlated with variability in the explant filtration rate, and no water pumping was observed during periods of osculum closure. A linear relationship between filtration rate (FR) and OSA revealed a constant exhalant jet velocity: vjet = FR/OSA = 2.3 ± CI95% 0.13 cm s-1. The mean filtration rate of explants was 0.28 ± CI95% 0.06 ml min-1, corresponding to a volume-specific filtration rate of 15 ml min-1 (cm3 sponge)-1, which is 2 to 3 times higher than that reported for larger individuals of H. panicea with multiple oscula. This is the first demonstration of a direct relationship between filter feeding and osculum dynamics in a sponge.

AB - Contraction-inflation behavior, including the closure and opening of the exhalant opening (osculum), is common among sponges. This behavior may temporally affect filtration activity, making it difficult to study and understand sponge feeding biology. To examine the interplay between osculum dynamics and filtration activity, small (18 mm3) single-osculum explants of the demosponge Halichondria panicea were studied. Time-lapse video stereo-microscope recordings of the osculum cross-sectional area (OSA) were made simultaneously with measurements of the filtration rate (∼15°C, ∼20 PSU) using the clearance method. Osculum dynamics, as expressed by temporal variation of the OSA, including osculum contraction and expansion, correlated with variability in the explant filtration rate, and no water pumping was observed during periods of osculum closure. A linear relationship between filtration rate (FR) and OSA revealed a constant exhalant jet velocity: vjet = FR/OSA = 2.3 ± CI95% 0.13 cm s-1. The mean filtration rate of explants was 0.28 ± CI95% 0.06 ml min-1, corresponding to a volume-specific filtration rate of 15 ml min-1 (cm3 sponge)-1, which is 2 to 3 times higher than that reported for larger individuals of H. panicea with multiple oscula. This is the first demonstration of a direct relationship between filter feeding and osculum dynamics in a sponge.

KW - Contraction

KW - Filtration

KW - Osculum

KW - Pumping activity

KW - Sponge explant

U2 - 10.3354/meps12155

DO - 10.3354/meps12155

M3 - Journal article

AN - SCOPUS:85020483683

VL - 572

SP - 117

EP - 128

JO - Marine Ecology - Progress Series

JF - Marine Ecology - Progress Series

SN - 0171-8630

ER -