Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic)
12 pages, 4 figures, 4 tables Obelia dichotoma is a thecate hydroid with a worldwide distribution, occurring mainly on shallow water hard substrates. Since the trophic ecology of hydroids in polar waters is badly understood, the aim of the present work was to study qualitatively and quantitatively t...
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Online Access: | http://hdl.handle.net/10261/72151 https://doi.org/10.1007/s00300-012-1239-7 |
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ftcsic:oai:digital.csic.es:10261/72151 2024-02-11T09:55:04+01:00 Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) Orejas, Covadonga Rossi, Sergio Peralba, Áurea García, Eva Gili, Josep Maria Lippert, Heike 2013-01 http://hdl.handle.net/10261/72151 https://doi.org/10.1007/s00300-012-1239-7 en eng Springer https://doi.org/10.1007/s00300-012-1239-7 Polar Biology 36(1): 61-72 (2013) 0722-4060 http://hdl.handle.net/10261/72151 doi:10.1007/s00300-012-1239-7 1432-2056 none Trophic ecology Benthic suspension feeders Hydroids Obelia dichotoma Arctic artículo http://purl.org/coar/resource_type/c_6501 2013 ftcsic https://doi.org/10.1007/s00300-012-1239-7 2024-01-16T09:47:37Z 12 pages, 4 figures, 4 tables Obelia dichotoma is a thecate hydroid with a worldwide distribution, occurring mainly on shallow water hard substrates. Since the trophic ecology of hydroids in polar waters is badly understood, the aim of the present work was to study qualitatively and quantitatively the diet of these organisms in an Arctic environment and to determine their trophic significance. For this purpose, the density of the hydroid population was documented, and simultaneously, zooplankton was sampled in two different years (1997 and 1998). Prey capture rates were estimated by analysing the gastrovascular content of the polyps in a diurnal cycle. Additionally, the digestion time of O. dichotoma was measured by laboratory feeding experiments using diatoms as food items. The analyses of the gastrovascular cavities of the polyps sampled during the diurnal cycles showed that O. dichotoma fed mainly on faecal pellets, organic matter and microalgae. Zooplankton prey was also observed, but gastrovascular contents and zooplankton abundance did not show any correlation in both years. The consumption rates of the hydroid populations differed between the 2 years. It was almost double (8.9 mg Carbon m−2) in 1998 compared to 1997 (5.5 mg Carbon m−2). The significance of the environmental variability in the feeding ecology and population dynamics of hydroids under Arctic conditions is discussed The support of the scientific and technical staff of the Koldewey-Station, the members of the Alfred Wegener Institute (AWI) diving team and the Ny-A° lesund International Research and Monitoring Facility is gratefully acknowledged. Thanks are due to the AWI for technical and financial support. The first author was financially supported by a Deutscher Akademischer Austausch Dienst (DAAD) fellowship (A/96/13073) and a European Commission fellowship from the programme Training and mobility of researchers (TMR-CT97-2813). S. Rossi was funded by a Ramón y Cajal contract (RYC-2007-01327). Special thanks to Prof. Dr. Wolf E. Arntz ... Article in Journal/Newspaper Alfred Wegener Institute Arctic Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen Digital.CSIC (Spanish National Research Council) Arctic Lesund ENVELOPE(8.470,8.470,63.331,63.331) Polar Biology 36 1 61 72 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Trophic ecology Benthic suspension feeders Hydroids Obelia dichotoma Arctic |
spellingShingle |
Trophic ecology Benthic suspension feeders Hydroids Obelia dichotoma Arctic Orejas, Covadonga Rossi, Sergio Peralba, Áurea García, Eva Gili, Josep Maria Lippert, Heike Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
topic_facet |
Trophic ecology Benthic suspension feeders Hydroids Obelia dichotoma Arctic |
description |
12 pages, 4 figures, 4 tables Obelia dichotoma is a thecate hydroid with a worldwide distribution, occurring mainly on shallow water hard substrates. Since the trophic ecology of hydroids in polar waters is badly understood, the aim of the present work was to study qualitatively and quantitatively the diet of these organisms in an Arctic environment and to determine their trophic significance. For this purpose, the density of the hydroid population was documented, and simultaneously, zooplankton was sampled in two different years (1997 and 1998). Prey capture rates were estimated by analysing the gastrovascular content of the polyps in a diurnal cycle. Additionally, the digestion time of O. dichotoma was measured by laboratory feeding experiments using diatoms as food items. The analyses of the gastrovascular cavities of the polyps sampled during the diurnal cycles showed that O. dichotoma fed mainly on faecal pellets, organic matter and microalgae. Zooplankton prey was also observed, but gastrovascular contents and zooplankton abundance did not show any correlation in both years. The consumption rates of the hydroid populations differed between the 2 years. It was almost double (8.9 mg Carbon m−2) in 1998 compared to 1997 (5.5 mg Carbon m−2). The significance of the environmental variability in the feeding ecology and population dynamics of hydroids under Arctic conditions is discussed The support of the scientific and technical staff of the Koldewey-Station, the members of the Alfred Wegener Institute (AWI) diving team and the Ny-A° lesund International Research and Monitoring Facility is gratefully acknowledged. Thanks are due to the AWI for technical and financial support. The first author was financially supported by a Deutscher Akademischer Austausch Dienst (DAAD) fellowship (A/96/13073) and a European Commission fellowship from the programme Training and mobility of researchers (TMR-CT97-2813). S. Rossi was funded by a Ramón y Cajal contract (RYC-2007-01327). Special thanks to Prof. Dr. Wolf E. Arntz ... |
format |
Article in Journal/Newspaper |
author |
Orejas, Covadonga Rossi, Sergio Peralba, Áurea García, Eva Gili, Josep Maria Lippert, Heike |
author_facet |
Orejas, Covadonga Rossi, Sergio Peralba, Áurea García, Eva Gili, Josep Maria Lippert, Heike |
author_sort |
Orejas, Covadonga |
title |
Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
title_short |
Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
title_full |
Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
title_fullStr |
Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
title_full_unstemmed |
Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
title_sort |
feeding ecology and trophic impact of the hydroid obelia dichotoma in the kongsfjorden (spitsbergen, arctic) |
publisher |
Springer |
publishDate |
2013 |
url |
http://hdl.handle.net/10261/72151 https://doi.org/10.1007/s00300-012-1239-7 |
long_lat |
ENVELOPE(8.470,8.470,63.331,63.331) |
geographic |
Arctic Lesund |
geographic_facet |
Arctic Lesund |
genre |
Alfred Wegener Institute Arctic Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen |
genre_facet |
Alfred Wegener Institute Arctic Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen |
op_relation |
https://doi.org/10.1007/s00300-012-1239-7 Polar Biology 36(1): 61-72 (2013) 0722-4060 http://hdl.handle.net/10261/72151 doi:10.1007/s00300-012-1239-7 1432-2056 |
op_rights |
none |
op_doi |
https://doi.org/10.1007/s00300-012-1239-7 |
container_title |
Polar Biology |
container_volume |
36 |
container_issue |
1 |
container_start_page |
61 |
op_container_end_page |
72 |
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1790593696145604608 |