The density of the eggs of Calanus finmarchicus
The vertical distribution of plankton organisms and their eggs depends largely on their surface area and density (Eyden, 1923). Gross & Raymont (1942) observed that the eggs of Calanus finmarchicus had a density (1.045–1.049 g/cc) greater than that of sea water (1.0235–1.025 g/cc), and that they...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Cambridge University Press (CUP)
1956
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Online Access: | http://dx.doi.org/10.1017/s0025315400010407 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400010407 |
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crcambridgeupr:10.1017/s0025315400010407 2024-03-03T08:43:23+00:00 The density of the eggs of Calanus finmarchicus Salzen, E. A. 1956 http://dx.doi.org/10.1017/s0025315400010407 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400010407 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 35, issue 3, page 549-554 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 1956 crcambridgeupr https://doi.org/10.1017/s0025315400010407 2024-02-08T08:46:04Z The vertical distribution of plankton organisms and their eggs depends largely on their surface area and density (Eyden, 1923). Gross & Raymont (1942) observed that the eggs of Calanus finmarchicus had a density (1.045–1.049 g/cc) greater than that of sea water (1.0235–1.025 g/cc), and that they sank at the rate of approximately 2.5 cm/min at 13°C. These workers pointed out that since the embryo takes 24 h to complete development, the eggs will sink in still water to a depth of 36 m before hatching and yet the data available, although not extensive, suggests that both eggs and nauplii are found most abundantly nearer the surface than this (Nicholls, 1933; Kraefft, 1910). If these observations are correct, then in addition to density and viscosity, there must be a third factor affecting the distribution of these eggs. Unfortunately, Gross & Raymont did not consider the possible effect of viscosity in their method for determining density, and they themselves commented on the disturbing degree of variation in some of their results. Their measurements of the rate of sinking of the eggs in sea water also showed considerable variation. It seemed worth while, therefore, to measure the density of these eggs using the density gradient technique of Linderstrøm-Lang (1937), a method which enables the individual and precise measurement of the density of small living objects, independent of their shape, i.e. surface area. This method was being used in work on Psammechinus eggs at the Marine Station, Millport, and, at the suggestion of Dr A. P. Orr, the following measurements were made on the eggs of Calanus finmarchicus . Article in Journal/Newspaper Calanus finmarchicus Cambridge University Press Journal of the Marine Biological Association of the United Kingdom 35 3 549 554 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Salzen, E. A. The density of the eggs of Calanus finmarchicus |
topic_facet |
Aquatic Science |
description |
The vertical distribution of plankton organisms and their eggs depends largely on their surface area and density (Eyden, 1923). Gross & Raymont (1942) observed that the eggs of Calanus finmarchicus had a density (1.045–1.049 g/cc) greater than that of sea water (1.0235–1.025 g/cc), and that they sank at the rate of approximately 2.5 cm/min at 13°C. These workers pointed out that since the embryo takes 24 h to complete development, the eggs will sink in still water to a depth of 36 m before hatching and yet the data available, although not extensive, suggests that both eggs and nauplii are found most abundantly nearer the surface than this (Nicholls, 1933; Kraefft, 1910). If these observations are correct, then in addition to density and viscosity, there must be a third factor affecting the distribution of these eggs. Unfortunately, Gross & Raymont did not consider the possible effect of viscosity in their method for determining density, and they themselves commented on the disturbing degree of variation in some of their results. Their measurements of the rate of sinking of the eggs in sea water also showed considerable variation. It seemed worth while, therefore, to measure the density of these eggs using the density gradient technique of Linderstrøm-Lang (1937), a method which enables the individual and precise measurement of the density of small living objects, independent of their shape, i.e. surface area. This method was being used in work on Psammechinus eggs at the Marine Station, Millport, and, at the suggestion of Dr A. P. Orr, the following measurements were made on the eggs of Calanus finmarchicus . |
format |
Article in Journal/Newspaper |
author |
Salzen, E. A. |
author_facet |
Salzen, E. A. |
author_sort |
Salzen, E. A. |
title |
The density of the eggs of Calanus finmarchicus |
title_short |
The density of the eggs of Calanus finmarchicus |
title_full |
The density of the eggs of Calanus finmarchicus |
title_fullStr |
The density of the eggs of Calanus finmarchicus |
title_full_unstemmed |
The density of the eggs of Calanus finmarchicus |
title_sort |
density of the eggs of calanus finmarchicus |
publisher |
Cambridge University Press (CUP) |
publishDate |
1956 |
url |
http://dx.doi.org/10.1017/s0025315400010407 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400010407 |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 35, issue 3, page 549-554 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315400010407 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
35 |
container_issue |
3 |
container_start_page |
549 |
op_container_end_page |
554 |
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1792498813849567232 |