Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic

Euphausiids are an important component of the northern North Atlantic ecosystem and several species are found in the Irminger Sea. However, data on euphausiids in this region are few, particularly for Thysanopoda acutifrons , Thysanoessa inermis and Nematobranchion boöpis . In this paper, we present...

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Published in:Journal of the Marine Biological Association of the United Kingdom
Main Authors: Saunders, R.A., Rasmussen, J., Tarling, G.A., Brierley, A.S.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2012
Subjects:
Online Access:http://dx.doi.org/10.1017/s0025315412001385
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315412001385
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spelling crcambridgeupr:10.1017/s0025315412001385 2024-03-03T08:44:01+00:00 Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic Saunders, R.A. Rasmussen, J. Tarling, G.A. Brierley, A.S. 2012 http://dx.doi.org/10.1017/s0025315412001385 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315412001385 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 93, issue 5, page 1287-1301 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 2012 crcambridgeupr https://doi.org/10.1017/s0025315412001385 2024-02-08T08:42:01Z Euphausiids are an important component of the northern North Atlantic ecosystem and several species are found in the Irminger Sea. However, data on euphausiids in this region are few, particularly for Thysanopoda acutifrons , Thysanoessa inermis and Nematobranchion boöpis . In this paper, we present the first data since the 1930s on the seasonal distribution and population dynamics of these species from net haul data collected in the Irminger Sea during winter, spring and summer 2001–2002. Thysanoessa inermis was the most numerically abundant (0.63–26.62 ind. 1000 m −3 ) of the three species in the region and comprised a biomass of 3.92–41.74 mg 1000 m −3 . The species was largely found in the upper regions of the water column (0–400 m) and was distributed in the more on-shelf/shelf-break regions around East Greenland and Iceland. Growth rates were around 0.03 mm d −1 for T. inermis and there was some evidence that either the timing of spawning was delayed, or larval development was prolonged in the region. Thysanopoda acutifrons was predominantly distributed below 400 m in more oceanic regions and had a low abundance (1.23–1.64 ind. 1000 m −3 ) throughout the Irminger Sea. However, the species comprised a relatively high proportion of biomass (19.39–31.33 mg 1000 m −3 ) due to its large body size. Our data showed that the species had low rates of growth (0.04 mm d −1 ) and development throughout the year, and that the reproductive season occurred during the overwintering period (November/December) once individuals had reached two years of age. Nematobranchion boöpis mainly occurred below 400 m at low abundance (0.06–0.18 ind.1000 m −3 ) levels throughout the region. The species was largely found where Atlantic waters prevailed in the Irminger Current and its growth rates were variable (0.02–0.06 mm d −1 ). Nematobranchion boöpis was a year-round spawner and the species had fairly rapid rates of post-larval development, with the newly spawned 0-group reaching sexual maturity within the first 6 months. Data ... Article in Journal/Newspaper East Greenland Greenland Iceland North Atlantic Thysanoessa inermis Cambridge University Press Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Journal of the Marine Biological Association of the United Kingdom 93 5 1287 1301
institution Open Polar
collection Cambridge University Press
op_collection_id crcambridgeupr
language English
topic Aquatic Science
spellingShingle Aquatic Science
Saunders, R.A.
Rasmussen, J.
Tarling, G.A.
Brierley, A.S.
Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
topic_facet Aquatic Science
description Euphausiids are an important component of the northern North Atlantic ecosystem and several species are found in the Irminger Sea. However, data on euphausiids in this region are few, particularly for Thysanopoda acutifrons , Thysanoessa inermis and Nematobranchion boöpis . In this paper, we present the first data since the 1930s on the seasonal distribution and population dynamics of these species from net haul data collected in the Irminger Sea during winter, spring and summer 2001–2002. Thysanoessa inermis was the most numerically abundant (0.63–26.62 ind. 1000 m −3 ) of the three species in the region and comprised a biomass of 3.92–41.74 mg 1000 m −3 . The species was largely found in the upper regions of the water column (0–400 m) and was distributed in the more on-shelf/shelf-break regions around East Greenland and Iceland. Growth rates were around 0.03 mm d −1 for T. inermis and there was some evidence that either the timing of spawning was delayed, or larval development was prolonged in the region. Thysanopoda acutifrons was predominantly distributed below 400 m in more oceanic regions and had a low abundance (1.23–1.64 ind. 1000 m −3 ) throughout the Irminger Sea. However, the species comprised a relatively high proportion of biomass (19.39–31.33 mg 1000 m −3 ) due to its large body size. Our data showed that the species had low rates of growth (0.04 mm d −1 ) and development throughout the year, and that the reproductive season occurred during the overwintering period (November/December) once individuals had reached two years of age. Nematobranchion boöpis mainly occurred below 400 m at low abundance (0.06–0.18 ind.1000 m −3 ) levels throughout the region. The species was largely found where Atlantic waters prevailed in the Irminger Current and its growth rates were variable (0.02–0.06 mm d −1 ). Nematobranchion boöpis was a year-round spawner and the species had fairly rapid rates of post-larval development, with the newly spawned 0-group reaching sexual maturity within the first 6 months. Data ...
format Article in Journal/Newspaper
author Saunders, R.A.
Rasmussen, J.
Tarling, G.A.
Brierley, A.S.
author_facet Saunders, R.A.
Rasmussen, J.
Tarling, G.A.
Brierley, A.S.
author_sort Saunders, R.A.
title Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
title_short Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
title_full Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
title_fullStr Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
title_full_unstemmed Distribution, population dynamics and growth rates of Thysanopoda acutifrons , Thysanoessa inermis and Nematobrachion boöpis in the Irminger Sea, North Atlantic
title_sort distribution, population dynamics and growth rates of thysanopoda acutifrons , thysanoessa inermis and nematobrachion boöpis in the irminger sea, north atlantic
publisher Cambridge University Press (CUP)
publishDate 2012
url http://dx.doi.org/10.1017/s0025315412001385
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315412001385
long_lat ENVELOPE(-34.041,-34.041,63.054,63.054)
geographic Greenland
Irminger Sea
geographic_facet Greenland
Irminger Sea
genre East Greenland
Greenland
Iceland
North Atlantic
Thysanoessa inermis
genre_facet East Greenland
Greenland
Iceland
North Atlantic
Thysanoessa inermis
op_source Journal of the Marine Biological Association of the United Kingdom
volume 93, issue 5, page 1287-1301
ISSN 0025-3154 1469-7769
op_rights https://www.cambridge.org/core/terms
op_doi https://doi.org/10.1017/s0025315412001385
container_title Journal of the Marine Biological Association of the United Kingdom
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container_issue 5
container_start_page 1287
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