A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen
Pigment analysis (HPLC and fluorometry) and light microscopy observations of the gut content of Thelepus extensus (Terebellidae) and surrounding sediments were carried out at two hydrodynamically contrasting sites at subantarctic Îles Kerguelen; 1) a sheltered site (Port-Raymond) with a dense popula...
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Online Access: | http://dx.doi.org/10.1017/s0954102000000080 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000080 |
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crcambridgeupr:10.1017/s0954102000000080 2024-03-03T08:39:29+00:00 A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen Riaux-Gobin, Catherine Klein, Bert Duchêne, Jean-Claude 2000 http://dx.doi.org/10.1017/s0954102000000080 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000080 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 12, issue 1, page 52-63 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2000 crcambridgeupr https://doi.org/10.1017/s0954102000000080 2024-02-08T08:37:03Z Pigment analysis (HPLC and fluorometry) and light microscopy observations of the gut content of Thelepus extensus (Terebellidae) and surrounding sediments were carried out at two hydrodynamically contrasting sites at subantarctic Îles Kerguelen; 1) a sheltered site (Port-Raymond) with a dense population of large-bodied animals, and 2) an exposed site (Port-aux-Français) with a scarce population of smaller individuals. Chlorophyll a derivatives (phaeophorbide a -like) were the most abundant pigments in sediments and polychaete digestive tracts. The second important group of pigments consisted of five unknown carotenoids of which two were present only in the polychaete digestive tract. Pigments in the muddy sediment at the sheltered site appeared to originate from the grazing activity of the polychaetes, as suggested by the high concentrations of degradation products and the same phaeophorbides observed both in the sediment and in the gut contents. Material originating from the dense Macrocystis pyrifera (Phaeophyceae) and Ulvae (Chlorophyceae) cover constituted a large part of the polychaetes' diet at this sheltered site, as indicated by macroalgal debris in the gut contents and the presence of violaxanthin in the sediment and lutein/zeaxanthin in both polychaetes and sediments. The polychaetes seem to adapt their grazing mode to the environmental conditions, preferring suspension feeding in the sheltered site and deposit feeding at the exposed site. The different morphologies, behaviours and life spans of the two conspecific populations may by linked to the contrasting hydrodynamics of the two sites and to their respective diets. Article in Journal/Newspaper Antarctic Science Cambridge University Press Kerguelen Îles Kerguelen ENVELOPE(69.167,69.167,-49.250,-49.250) Port-Raymond ENVELOPE(69.817,69.817,-49.333,-49.333) Antarctic Science 12 1 52 63 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Riaux-Gobin, Catherine Klein, Bert Duchêne, Jean-Claude A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Pigment analysis (HPLC and fluorometry) and light microscopy observations of the gut content of Thelepus extensus (Terebellidae) and surrounding sediments were carried out at two hydrodynamically contrasting sites at subantarctic Îles Kerguelen; 1) a sheltered site (Port-Raymond) with a dense population of large-bodied animals, and 2) an exposed site (Port-aux-Français) with a scarce population of smaller individuals. Chlorophyll a derivatives (phaeophorbide a -like) were the most abundant pigments in sediments and polychaete digestive tracts. The second important group of pigments consisted of five unknown carotenoids of which two were present only in the polychaete digestive tract. Pigments in the muddy sediment at the sheltered site appeared to originate from the grazing activity of the polychaetes, as suggested by the high concentrations of degradation products and the same phaeophorbides observed both in the sediment and in the gut contents. Material originating from the dense Macrocystis pyrifera (Phaeophyceae) and Ulvae (Chlorophyceae) cover constituted a large part of the polychaetes' diet at this sheltered site, as indicated by macroalgal debris in the gut contents and the presence of violaxanthin in the sediment and lutein/zeaxanthin in both polychaetes and sediments. The polychaetes seem to adapt their grazing mode to the environmental conditions, preferring suspension feeding in the sheltered site and deposit feeding at the exposed site. The different morphologies, behaviours and life spans of the two conspecific populations may by linked to the contrasting hydrodynamics of the two sites and to their respective diets. |
format |
Article in Journal/Newspaper |
author |
Riaux-Gobin, Catherine Klein, Bert Duchêne, Jean-Claude |
author_facet |
Riaux-Gobin, Catherine Klein, Bert Duchêne, Jean-Claude |
author_sort |
Riaux-Gobin, Catherine |
title |
A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
title_short |
A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
title_full |
A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
title_fullStr |
A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
title_full_unstemmed |
A pigment analysis of feeding modes of Thelepus extensus (Polychaeta, Terebellidae) in relation to wave exposure at the Îles Kerguelen |
title_sort |
pigment analysis of feeding modes of thelepus extensus (polychaeta, terebellidae) in relation to wave exposure at the îles kerguelen |
publisher |
Cambridge University Press (CUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1017/s0954102000000080 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000080 |
long_lat |
ENVELOPE(69.167,69.167,-49.250,-49.250) ENVELOPE(69.817,69.817,-49.333,-49.333) |
geographic |
Kerguelen Îles Kerguelen Port-Raymond |
geographic_facet |
Kerguelen Îles Kerguelen Port-Raymond |
genre |
Antarctic Science |
genre_facet |
Antarctic Science |
op_source |
Antarctic Science volume 12, issue 1, page 52-63 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102000000080 |
container_title |
Antarctic Science |
container_volume |
12 |
container_issue |
1 |
container_start_page |
52 |
op_container_end_page |
63 |
_version_ |
1792495046061195264 |