Diurnal Variations in the Grazing of Planktonic Copepods
Records were made of the presence or absence of food in the guts of Calanus finmarchicus caught in three different depths, at intervals of 4 hr. through 24 hr. It was found that 80-100 % of the Calanus caught at the surface were full of food at all hours of the day. The number of Calanus containing...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Language: | English |
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Cambridge University Press (CUP)
1953
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Online Access: | http://dx.doi.org/10.1017/s0025315400011619 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400011619 |
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crcambridgeupr:10.1017/s0025315400011619 2024-03-03T08:43:24+00:00 Diurnal Variations in the Grazing of Planktonic Copepods Gauld, D. T. 1953 http://dx.doi.org/10.1017/s0025315400011619 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400011619 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 31, issue 3, page 461-474 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 1953 crcambridgeupr https://doi.org/10.1017/s0025315400011619 2024-02-08T08:32:44Z Records were made of the presence or absence of food in the guts of Calanus finmarchicus caught in three different depths, at intervals of 4 hr. through 24 hr. It was found that 80-100 % of the Calanus caught at the surface were full of food at all hours of the day. The number of Calanus containing food in deeper water was distinctly less. This may be correlated with the abundance of its food close to the surface. Diurnal vertical migrations took place on some occasions when samples were taken, but not on all. In the absence of vertical migration Calanus was abundant at the surface and feeding continuously at all hours of the 24 hr. Where vertical migration took place feeding was mostly at the surface and was restricted to the hours of darkness, i.e. in summer to a period distinctly less than 8 hr. round midnight. Laboratory observations confirm the absence of any feeding rhythm. Article in Journal/Newspaper Calanus finmarchicus Copepods Cambridge University Press Journal of the Marine Biological Association of the United Kingdom 31 3 461 474 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Gauld, D. T. Diurnal Variations in the Grazing of Planktonic Copepods |
topic_facet |
Aquatic Science |
description |
Records were made of the presence or absence of food in the guts of Calanus finmarchicus caught in three different depths, at intervals of 4 hr. through 24 hr. It was found that 80-100 % of the Calanus caught at the surface were full of food at all hours of the day. The number of Calanus containing food in deeper water was distinctly less. This may be correlated with the abundance of its food close to the surface. Diurnal vertical migrations took place on some occasions when samples were taken, but not on all. In the absence of vertical migration Calanus was abundant at the surface and feeding continuously at all hours of the 24 hr. Where vertical migration took place feeding was mostly at the surface and was restricted to the hours of darkness, i.e. in summer to a period distinctly less than 8 hr. round midnight. Laboratory observations confirm the absence of any feeding rhythm. |
format |
Article in Journal/Newspaper |
author |
Gauld, D. T. |
author_facet |
Gauld, D. T. |
author_sort |
Gauld, D. T. |
title |
Diurnal Variations in the Grazing of Planktonic Copepods |
title_short |
Diurnal Variations in the Grazing of Planktonic Copepods |
title_full |
Diurnal Variations in the Grazing of Planktonic Copepods |
title_fullStr |
Diurnal Variations in the Grazing of Planktonic Copepods |
title_full_unstemmed |
Diurnal Variations in the Grazing of Planktonic Copepods |
title_sort |
diurnal variations in the grazing of planktonic copepods |
publisher |
Cambridge University Press (CUP) |
publishDate |
1953 |
url |
http://dx.doi.org/10.1017/s0025315400011619 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400011619 |
genre |
Calanus finmarchicus Copepods |
genre_facet |
Calanus finmarchicus Copepods |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 31, issue 3, page 461-474 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315400011619 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
31 |
container_issue |
3 |
container_start_page |
461 |
op_container_end_page |
474 |
_version_ |
1792498822278021120 |