Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic)
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...
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ftcsic:oai:digital.csic.es:10261/317968 2024-02-11T10:00:19+01:00 Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) Orejas, Covadonga Rossi, Sergio Peralba, Aurea García, Eva Gili, Josep María Lippert, Heike Arctic Ocean 2013 http://hdl.handle.net/10508/8524 http://hdl.handle.net/10261/317968 https://doi.org/10.1007/s00300-012-1239-7 en eng Centro Oceanográfico de Baleares Polar Biology, 36. 2013: 61-72 0722-4060 http://hdl.handle.net/10508/8524 http://hdl.handle.net/10261/317968 doi:10.1007/s00300-012-1239-7 5534 none Centro Oceanográfico de Baleares Trophic ecology Medio Marino Benthic suspensión feeders Hydroids Obelia dichotoma Arctic research article 2013 ftcsic https://doi.org/10.1007/s00300-012-1239-7 2024-01-16T11:44:56Z 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. Sí Article in Journal/Newspaper Arctic Arctic Ocean Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen Digital.CSIC (Spanish National Research Council) Arctic Arctic Ocean Polar Biology 36 1 61 72 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Centro Oceanográfico de Baleares Trophic ecology Medio Marino Benthic suspensión feeders Hydroids Obelia dichotoma Arctic |
spellingShingle |
Centro Oceanográfico de Baleares Trophic ecology Medio Marino Benthic suspensión feeders Hydroids Obelia dichotoma Arctic Orejas, Covadonga Rossi, Sergio Peralba, Aurea García, Eva Gili, Josep María Lippert, Heike Feeding ecology and trophic impact of the hydroid Obelia dichotoma in the Kongsfjorden (Spitsbergen, Arctic) |
topic_facet |
Centro Oceanográfico de Baleares Trophic ecology Medio Marino Benthic suspensión feeders Hydroids Obelia dichotoma Arctic |
description |
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. Sí |
format |
Article in Journal/Newspaper |
author |
Orejas, Covadonga Rossi, Sergio Peralba, Aurea García, Eva Gili, Josep María Lippert, Heike |
author_facet |
Orejas, Covadonga Rossi, Sergio Peralba, Aurea García, Eva Gili, Josep María 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) |
publishDate |
2013 |
url |
http://hdl.handle.net/10508/8524 http://hdl.handle.net/10261/317968 https://doi.org/10.1007/s00300-012-1239-7 |
op_coverage |
Arctic Ocean |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen |
genre_facet |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Polar Biology Zooplankton Spitsbergen |
op_relation |
Centro Oceanográfico de Baleares Polar Biology, 36. 2013: 61-72 0722-4060 http://hdl.handle.net/10508/8524 http://hdl.handle.net/10261/317968 doi:10.1007/s00300-012-1239-7 5534 |
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 |
_version_ |
1790596030944772096 |