Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea
The distribution and abundance of the euphausiids Thysanoessa raschi and Thysanoessa inermis in the shelf waters of the southeastern Bering Sea were investigated during spring and summer of 1980 and 1981. Experiments were conducted during the study to describe the reproduction, growth and developmen...
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Norwegian Polar Institute
1991
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ftjpolarres:oai:journals.openacademia.net:article/2330 2023-05-15T15:43:32+02:00 Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea Smith, Sharon L. 1991-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2330 https://doi.org/10.3402/polar.v10i2.6759 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2330/5580 https://polarresearch.net/index.php/polar/article/view/2330 doi:10.3402/polar.v10i2.6759 Copyright (c) 2018 Polar Research Polar Research; Vol. 10 No. 2 (1991): Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 2; 461-478 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftjpolarres https://doi.org/10.3402/polar.v10i2.6759 2021-11-11T19:12:32Z The distribution and abundance of the euphausiids Thysanoessa raschi and Thysanoessa inermis in the shelf waters of the southeastern Bering Sea were investigated during spring and summer of 1980 and 1981. Experiments were conducted during the study to describe the reproduction, growth and development of these species. T. inermis was the dominant euphausiid species observed over the outer shelf region; it began spawning in early April while T. raschi dominated the euphausiids over the middle shelf and began spawning in mid or late May. The seasonal progression in spawning followed the seasonal development of temperature; however, spawning did not begin earlier in 1981 which was a warmer year than 1980. Average egg production of T. raschi ranged from 3.4% to 3.8% dry body weight of the female per day during the first three days after capture. Secondary production estimates for T. raschi females ranged from 4.2% to 5.2% dry body weight per day in 1980 and 5.9% to 6.0% dry body weight per day in 1981. A sharp decline in the abundance of adolescent and adult euphausiids over the middle shelf during the spring bloom period when food appeared to be abundant suggests that predation by diving birds, pollack. Tanner crabs, whales and seals effectively controls the euphausiid population. Article in Journal/Newspaper Bering Sea Polar Research Thysanoessa inermis Polar Research (E-Journal) Bering Sea Polar Research 10 2 461 478 |
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Open Polar |
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Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
The distribution and abundance of the euphausiids Thysanoessa raschi and Thysanoessa inermis in the shelf waters of the southeastern Bering Sea were investigated during spring and summer of 1980 and 1981. Experiments were conducted during the study to describe the reproduction, growth and development of these species. T. inermis was the dominant euphausiid species observed over the outer shelf region; it began spawning in early April while T. raschi dominated the euphausiids over the middle shelf and began spawning in mid or late May. The seasonal progression in spawning followed the seasonal development of temperature; however, spawning did not begin earlier in 1981 which was a warmer year than 1980. Average egg production of T. raschi ranged from 3.4% to 3.8% dry body weight of the female per day during the first three days after capture. Secondary production estimates for T. raschi females ranged from 4.2% to 5.2% dry body weight per day in 1980 and 5.9% to 6.0% dry body weight per day in 1981. A sharp decline in the abundance of adolescent and adult euphausiids over the middle shelf during the spring bloom period when food appeared to be abundant suggests that predation by diving birds, pollack. Tanner crabs, whales and seals effectively controls the euphausiid population. |
format |
Article in Journal/Newspaper |
author |
Smith, Sharon L. |
spellingShingle |
Smith, Sharon L. Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
author_facet |
Smith, Sharon L. |
author_sort |
Smith, Sharon L. |
title |
Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
title_short |
Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
title_full |
Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
title_fullStr |
Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
title_full_unstemmed |
Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea |
title_sort |
growth, development and distribution of the euphausiids thysanoessa raschi (m. sars) and thysanoessa inermis (krøyer) in the southeastern bering sea |
publisher |
Norwegian Polar Institute |
publishDate |
1991 |
url |
https://polarresearch.net/index.php/polar/article/view/2330 https://doi.org/10.3402/polar.v10i2.6759 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Polar Research Thysanoessa inermis |
genre_facet |
Bering Sea Polar Research Thysanoessa inermis |
op_source |
Polar Research; Vol. 10 No. 2 (1991): Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 2; 461-478 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2330/5580 https://polarresearch.net/index.php/polar/article/view/2330 doi:10.3402/polar.v10i2.6759 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v10i2.6759 |
container_title |
Polar Research |
container_volume |
10 |
container_issue |
2 |
container_start_page |
461 |
op_container_end_page |
478 |
_version_ |
1766377715129122816 |