Seasonality in Lipid Content of the Demosponges Halichondria panicea and H. bowerbanki at Two Study Sites in Temperate Danish Waters

Florian Lüskow, Kirstine Kløve-Mogensen, Jakob Tophøj, Lars Haastrup Pedersen, Hans Ulrik Riisgård, Niels Thomas Eriksen

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Resumé

This study relates the lipid content of two marine filter-feeding demosponges, Halichondria panicea and H. bowerbanki to the seasonal availability of their suspended food, mainly free-living bacteria and phytoplankton at two study sites in Danish waters. The aim was to investigate if the lipid content of sponges is linked to food availability and season, and to what extend free-living bacteria are available in starvation periods where the phytoplankton biomass is low. The highest concentrations of bacteria were observed during summer when also chlorophyll a concentrations were high, and therefore bacteria and phytoplankton were available in similar ratio at all seasons. Bacterial cell carbon was estimated to contribute 2.9 and 4.6% compared to phytoplankton cell carbon in the food at the two sites, respectively, and free-living bacteria were available only as a minor food source at all seasons. Highest lipid contents (29.5% of sponge dry weight) were seen in H. panicea at the site with lowest food availability, while the lipid content of H. bowerbanki was 11.5% of dry weight. No seasonal variations in lipid content as fraction of sponge dry weight were observed, and the lipid content was not affected by food availability or starvation. It remains unclear why the lipid-content levels at the two study sites were conspicuously different.

OriginalsprogEngelsk
Artikelnummer328
TidsskriftFrontiers in Marine Science
Vol/bind6
Sider (fra-til)1-7
Antal sider7
DOI
StatusUdgivet - 12 jun. 2019

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lipid content
phytoplankton
bacteria
food availability
starvation
carbon
seasonal variation
cells
chlorophyll
summer
biomass

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title = "Seasonality in Lipid Content of the Demosponges Halichondria panicea and H. bowerbanki at Two Study Sites in Temperate Danish Waters",
abstract = "This study relates the lipid content of two marine filter-feeding demosponges, Halichondria panicea and H. bowerbanki to the seasonal availability of their suspended food, mainly free-living bacteria and phytoplankton at two study sites in Danish waters. The aim was to investigate if the lipid content of sponges is linked to food availability and season, and to what extend free-living bacteria are available in starvation periods where the phytoplankton biomass is low. The highest concentrations of bacteria were observed during summer when also chlorophyll a concentrations were high, and therefore bacteria and phytoplankton were available in similar ratio at all seasons. Bacterial cell carbon was estimated to contribute 2.9 and 4.6{\%} compared to phytoplankton cell carbon in the food at the two sites, respectively, and free-living bacteria were available only as a minor food source at all seasons. Highest lipid contents (29.5{\%} of sponge dry weight) were seen in H. panicea at the site with lowest food availability, while the lipid content of H. bowerbanki was 11.5{\%} of dry weight. No seasonal variations in lipid content as fraction of sponge dry weight were observed, and the lipid content was not affected by food availability or starvation. It remains unclear why the lipid-content levels at the two study sites were conspicuously different.",
keywords = "Fatty acids, Filter-feeding, Free-living bacteria, Lipids, Phytoplankton, Porifera, Seasonality",
author = "Florian L{\"u}skow and Kirstine Kl{\o}ve-Mogensen and Jakob Toph{\o}j and Pedersen, {Lars Haastrup} and Riisg{\aa}rd, {Hans Ulrik} and Eriksen, {Niels Thomas}",
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month = "6",
day = "12",
doi = "10.3389/fmars.2019.00328",
language = "English",
volume = "6",
pages = "1--7",
journal = "Frontiers in Marine Science",
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publisher = "Frontiers Media",

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Seasonality in Lipid Content of the Demosponges Halichondria panicea and H. bowerbanki at Two Study Sites in Temperate Danish Waters. / Lüskow, Florian; Kløve-Mogensen, Kirstine; Tophøj, Jakob; Pedersen, Lars Haastrup; Riisgård, Hans Ulrik; Eriksen, Niels Thomas.

I: Frontiers in Marine Science, Bind 6, 328, 12.06.2019, s. 1-7.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Seasonality in Lipid Content of the Demosponges Halichondria panicea and H. bowerbanki at Two Study Sites in Temperate Danish Waters

AU - Lüskow, Florian

AU - Kløve-Mogensen, Kirstine

AU - Tophøj, Jakob

AU - Pedersen, Lars Haastrup

AU - Riisgård, Hans Ulrik

AU - Eriksen, Niels Thomas

PY - 2019/6/12

Y1 - 2019/6/12

N2 - This study relates the lipid content of two marine filter-feeding demosponges, Halichondria panicea and H. bowerbanki to the seasonal availability of their suspended food, mainly free-living bacteria and phytoplankton at two study sites in Danish waters. The aim was to investigate if the lipid content of sponges is linked to food availability and season, and to what extend free-living bacteria are available in starvation periods where the phytoplankton biomass is low. The highest concentrations of bacteria were observed during summer when also chlorophyll a concentrations were high, and therefore bacteria and phytoplankton were available in similar ratio at all seasons. Bacterial cell carbon was estimated to contribute 2.9 and 4.6% compared to phytoplankton cell carbon in the food at the two sites, respectively, and free-living bacteria were available only as a minor food source at all seasons. Highest lipid contents (29.5% of sponge dry weight) were seen in H. panicea at the site with lowest food availability, while the lipid content of H. bowerbanki was 11.5% of dry weight. No seasonal variations in lipid content as fraction of sponge dry weight were observed, and the lipid content was not affected by food availability or starvation. It remains unclear why the lipid-content levels at the two study sites were conspicuously different.

AB - This study relates the lipid content of two marine filter-feeding demosponges, Halichondria panicea and H. bowerbanki to the seasonal availability of their suspended food, mainly free-living bacteria and phytoplankton at two study sites in Danish waters. The aim was to investigate if the lipid content of sponges is linked to food availability and season, and to what extend free-living bacteria are available in starvation periods where the phytoplankton biomass is low. The highest concentrations of bacteria were observed during summer when also chlorophyll a concentrations were high, and therefore bacteria and phytoplankton were available in similar ratio at all seasons. Bacterial cell carbon was estimated to contribute 2.9 and 4.6% compared to phytoplankton cell carbon in the food at the two sites, respectively, and free-living bacteria were available only as a minor food source at all seasons. Highest lipid contents (29.5% of sponge dry weight) were seen in H. panicea at the site with lowest food availability, while the lipid content of H. bowerbanki was 11.5% of dry weight. No seasonal variations in lipid content as fraction of sponge dry weight were observed, and the lipid content was not affected by food availability or starvation. It remains unclear why the lipid-content levels at the two study sites were conspicuously different.

KW - Fatty acids

KW - Filter-feeding

KW - Free-living bacteria

KW - Lipids

KW - Phytoplankton

KW - Porifera

KW - Seasonality

UR - http://www.scopus.com/inward/record.url?scp=85068541759&partnerID=8YFLogxK

U2 - 10.3389/fmars.2019.00328

DO - 10.3389/fmars.2019.00328

M3 - Journal article

VL - 6

SP - 1

EP - 7

JO - Frontiers in Marine Science

JF - Frontiers in Marine Science

SN - 2296-7745

M1 - 328

ER -