Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism?
Length, sex and maturity stage of Antarctic krill Euphausia superba Dana occurring in discrete swarms were measured. Over a 14 d period 38 swarms were sampled in a small area southwest of Elephant Island, South Shetland Islands. Analysis indicated that the composition of the swarms in terms of the s...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Inter-Research
1992
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/519102/ https://doi.org/10.3354/meps082163 |
id |
ftnerc:oai:nora.nerc.ac.uk:519102 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:519102 2023-05-15T13:49:34+02:00 Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? Watkins, Jonathan L. Buchholz, F. Priddle, Julian Morris, D.J. Ricketts, C. 1992-01 http://nora.nerc.ac.uk/id/eprint/519102/ https://doi.org/10.3354/meps082163 unknown Inter-Research Watkins, Jonathan L.; Buchholz, F.; Priddle, Julian; Morris, D.J.; Ricketts, C. 1992 Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? Marine Ecology Progress Series, 82. 163-174. https://doi.org/10.3354/meps082163 <https://doi.org/10.3354/meps082163> Publication - Article PeerReviewed 1992 ftnerc https://doi.org/10.3354/meps082163 2023-02-04T19:46:02Z Length, sex and maturity stage of Antarctic krill Euphausia superba Dana occurring in discrete swarms were measured. Over a 14 d period 38 swarms were sampled in a small area southwest of Elephant Island, South Shetland Islands. Analysis indicated that the composition of the swarms in terms of the sex ratio and maturity stage was very variable. Swarms ranged from equal mixtures of male and female krill to nearly all one sex; furthermore krill of similar maturity frequently occurred together. The mean length of each maturity stage also varied between swarms; in some swarms the size of each maturity stage was bigger than average while in others each stage was smaller than average. The range of krill sizes in a swarm was often restricted, indicative of some type of size sorting. However size sorting alone could not account for the observed variation in sex ratio and maturity stage and it is likely that in addition, differential growth and active behavioural responses contribute to the observed variation. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba South Shetland Islands Natural Environment Research Council: NERC Open Research Archive Antarctic Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) South Shetland Islands Marine Ecology Progress Series 82 163 174 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Length, sex and maturity stage of Antarctic krill Euphausia superba Dana occurring in discrete swarms were measured. Over a 14 d period 38 swarms were sampled in a small area southwest of Elephant Island, South Shetland Islands. Analysis indicated that the composition of the swarms in terms of the sex ratio and maturity stage was very variable. Swarms ranged from equal mixtures of male and female krill to nearly all one sex; furthermore krill of similar maturity frequently occurred together. The mean length of each maturity stage also varied between swarms; in some swarms the size of each maturity stage was bigger than average while in others each stage was smaller than average. The range of krill sizes in a swarm was often restricted, indicative of some type of size sorting. However size sorting alone could not account for the observed variation in sex ratio and maturity stage and it is likely that in addition, differential growth and active behavioural responses contribute to the observed variation. |
format |
Article in Journal/Newspaper |
author |
Watkins, Jonathan L. Buchholz, F. Priddle, Julian Morris, D.J. Ricketts, C. |
spellingShingle |
Watkins, Jonathan L. Buchholz, F. Priddle, Julian Morris, D.J. Ricketts, C. Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
author_facet |
Watkins, Jonathan L. Buchholz, F. Priddle, Julian Morris, D.J. Ricketts, C. |
author_sort |
Watkins, Jonathan L. |
title |
Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
title_short |
Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
title_full |
Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
title_fullStr |
Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
title_full_unstemmed |
Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? |
title_sort |
variation in reproductive status of antarctic krill swarms; evidence for a size-related sorting mechanism? |
publisher |
Inter-Research |
publishDate |
1992 |
url |
http://nora.nerc.ac.uk/id/eprint/519102/ https://doi.org/10.3354/meps082163 |
long_lat |
ENVELOPE(-55.184,-55.184,-61.085,-61.085) |
geographic |
Antarctic Elephant Island South Shetland Islands |
geographic_facet |
Antarctic Elephant Island South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba South Shetland Islands |
op_relation |
Watkins, Jonathan L.; Buchholz, F.; Priddle, Julian; Morris, D.J.; Ricketts, C. 1992 Variation in reproductive status of Antarctic krill swarms; evidence for a size-related sorting mechanism? Marine Ecology Progress Series, 82. 163-174. https://doi.org/10.3354/meps082163 <https://doi.org/10.3354/meps082163> |
op_doi |
https://doi.org/10.3354/meps082163 |
container_title |
Marine Ecology Progress Series |
container_volume |
82 |
container_start_page |
163 |
op_container_end_page |
174 |
_version_ |
1766251742493671424 |