Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI
One hundred each of stage VI male and female and stage V Calanus finmarchicus were picked at random, and, by means of a projection microscope, measurements made on a number of segments in both metasome and urosome. The stage VI female population was mixed containing 95% of a smallsized population an...
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/s0025315400014545 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400014545 |
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crcambridgeupr:10.1017/s0025315400014545 2024-03-03T08:43:23+00:00 Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI Barnes, H. Barnes, Margaret 1953 http://dx.doi.org/10.1017/s0025315400014545 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400014545 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 32, issue 2, page 305-313 ISSN 0025-3154 1469-7769 Aquatic Science journal-article 1953 crcambridgeupr https://doi.org/10.1017/s0025315400014545 2024-02-08T08:36:04Z One hundred each of stage VI male and female and stage V Calanus finmarchicus were picked at random, and, by means of a projection microscope, measurements made on a number of segments in both metasome and urosome. The stage VI female population was mixed containing 95% of a smallsized population and 5% of a larger size-group. The males constituted a single population. At this time of the season the stage VI male and female metasomes are the same length, but there are differences in the sizes of the individual segments, the most striking of which is that of the head The stage V animals in many of the measurements could be quite clearly separated into two size-groups of about 50% each and it is suggested that these are potential male and female populations. This separation at 50/50 has been noticed in numerous other collections of stage V, but it shouldbe emphasized that the differences are population differences in regard to those measurements considered. Evidence is presented which shows that the state of the antennules after preservation in 5% neutral formalin is unlikely in stage V animals to be a reliable guide to their sex in the next stage. Article in Journal/Newspaper Calanus finmarchicus Cambridge University Press Gunn ENVELOPE(160.700,160.700,-76.867,-76.867) Journal of the Marine Biological Association of the United Kingdom 32 2 305 313 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Barnes, H. Barnes, Margaret Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
topic_facet |
Aquatic Science |
description |
One hundred each of stage VI male and female and stage V Calanus finmarchicus were picked at random, and, by means of a projection microscope, measurements made on a number of segments in both metasome and urosome. The stage VI female population was mixed containing 95% of a smallsized population and 5% of a larger size-group. The males constituted a single population. At this time of the season the stage VI male and female metasomes are the same length, but there are differences in the sizes of the individual segments, the most striking of which is that of the head The stage V animals in many of the measurements could be quite clearly separated into two size-groups of about 50% each and it is suggested that these are potential male and female populations. This separation at 50/50 has been noticed in numerous other collections of stage V, but it shouldbe emphasized that the differences are population differences in regard to those measurements considered. Evidence is presented which shows that the state of the antennules after preservation in 5% neutral formalin is unlikely in stage V animals to be a reliable guide to their sex in the next stage. |
format |
Article in Journal/Newspaper |
author |
Barnes, H. Barnes, Margaret |
author_facet |
Barnes, H. Barnes, Margaret |
author_sort |
Barnes, H. |
title |
Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
title_short |
Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
title_full |
Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
title_fullStr |
Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
title_full_unstemmed |
Biometry of the Copepod Calanus Finmarchicus (Gunn.) in Stages V and VI |
title_sort |
biometry of the copepod calanus finmarchicus (gunn.) in stages v and vi |
publisher |
Cambridge University Press (CUP) |
publishDate |
1953 |
url |
http://dx.doi.org/10.1017/s0025315400014545 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400014545 |
long_lat |
ENVELOPE(160.700,160.700,-76.867,-76.867) |
geographic |
Gunn |
geographic_facet |
Gunn |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 32, issue 2, page 305-313 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315400014545 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
32 |
container_issue |
2 |
container_start_page |
305 |
op_container_end_page |
313 |
_version_ |
1792498815401459712 |