Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms
An effect of the very patchy distribution of Antarctic krill (Euphausia superba Dana) in various forms of aggregation is that a single swarm may not provide an unbiased estimate of population parameters such as mean length of krill in the local area. Here, we analyse the number of samples required t...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/520937/ https://doi.org/10.1007/BF01313422 |
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ftnerc:oai:nora.nerc.ac.uk:520937 2023-05-15T13:49:35+02:00 Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms Watkins, Jonathan L. Morris, D. J. Ricketts, C. Murray, A. W. A. 1990-10 http://nora.nerc.ac.uk/id/eprint/520937/ https://doi.org/10.1007/BF01313422 unknown Springer Watkins, Jonathan L.; Morris, D. J.; Ricketts, C.; Murray, A. W. A. 1990 Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms. Marine Biology, 107 (3). 409-415. https://doi.org/10.1007/BF01313422 <https://doi.org/10.1007/BF01313422> Publication - Article PeerReviewed 1990 ftnerc https://doi.org/10.1007/BF01313422 2023-02-04T19:47:02Z An effect of the very patchy distribution of Antarctic krill (Euphausia superba Dana) in various forms of aggregation is that a single swarm may not provide an unbiased estimate of population parameters such as mean length of krill in the local area. Here, we analyse the number of samples required to estimate the characteristics of a local population as precisely as if there were no differences between krill swarms in terms of their biological composition. Krill were intensively sampled over different spatial and temporal scales around South Georgia in 1981 and 1982, and in the Bransfield Strait in 1985. These varied from replicate hauls at a single station over 24 h and repeat sampling in restricted areas over periods of 6 to 14 d to regional surveys around South Georgia and in the Bransfield Strait. Various biological characteristics were measured such as length, maturity, moult stage and feeding state. Depending upon the biological characteristic examined and the area covered by the sampling programme, the number of samples needed to obtain the same degree of precision as would be found in the absence of heterogeneity varied from 3 to > 80 samples. This has important implications for the design of net-sampling programme for monitoring krill populations. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Bransfield Strait Euphausia superba Natural Environment Research Council: NERC Open Research Archive Antarctic Bransfield Strait Marine Biology 107 3 409 415 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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An effect of the very patchy distribution of Antarctic krill (Euphausia superba Dana) in various forms of aggregation is that a single swarm may not provide an unbiased estimate of population parameters such as mean length of krill in the local area. Here, we analyse the number of samples required to estimate the characteristics of a local population as precisely as if there were no differences between krill swarms in terms of their biological composition. Krill were intensively sampled over different spatial and temporal scales around South Georgia in 1981 and 1982, and in the Bransfield Strait in 1985. These varied from replicate hauls at a single station over 24 h and repeat sampling in restricted areas over periods of 6 to 14 d to regional surveys around South Georgia and in the Bransfield Strait. Various biological characteristics were measured such as length, maturity, moult stage and feeding state. Depending upon the biological characteristic examined and the area covered by the sampling programme, the number of samples needed to obtain the same degree of precision as would be found in the absence of heterogeneity varied from 3 to > 80 samples. This has important implications for the design of net-sampling programme for monitoring krill populations. |
format |
Article in Journal/Newspaper |
author |
Watkins, Jonathan L. Morris, D. J. Ricketts, C. Murray, A. W. A. |
spellingShingle |
Watkins, Jonathan L. Morris, D. J. Ricketts, C. Murray, A. W. A. Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
author_facet |
Watkins, Jonathan L. Morris, D. J. Ricketts, C. Murray, A. W. A. |
author_sort |
Watkins, Jonathan L. |
title |
Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
title_short |
Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
title_full |
Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
title_fullStr |
Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
title_full_unstemmed |
Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms |
title_sort |
sampling biological characteristics of krill: effect of heterogeneous nature of swarms |
publisher |
Springer |
publishDate |
1990 |
url |
http://nora.nerc.ac.uk/id/eprint/520937/ https://doi.org/10.1007/BF01313422 |
geographic |
Antarctic Bransfield Strait |
geographic_facet |
Antarctic Bransfield Strait |
genre |
Antarc* Antarctic Antarctic Krill Bransfield Strait Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Bransfield Strait Euphausia superba |
op_relation |
Watkins, Jonathan L.; Morris, D. J.; Ricketts, C.; Murray, A. W. A. 1990 Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms. Marine Biology, 107 (3). 409-415. https://doi.org/10.1007/BF01313422 <https://doi.org/10.1007/BF01313422> |
op_doi |
https://doi.org/10.1007/BF01313422 |
container_title |
Marine Biology |
container_volume |
107 |
container_issue |
3 |
container_start_page |
409 |
op_container_end_page |
415 |
_version_ |
1766251807787450368 |