The compound eye as an indicator of age and shrinkage in Antarctic krill
Laboratory studies have shown that Antarctic krill ( Euphausia superba ) shrink if maintained in conditions of low food availability. Recent studies have also demonstrated that E. superba individuals may be shrinking in the field during winter. If krill shrink during the winter, conclusions reached...
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0954102095000538 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000538 |
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crcambridgeupr:10.1017/s0954102095000538 2024-03-03T08:38:05+00:00 The compound eye as an indicator of age and shrinkage in Antarctic krill Sun, S. Mare, William De La Nicol, Stephen 1995 http://dx.doi.org/10.1017/s0954102095000538 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000538 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 7, issue 4, page 387-392 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0954102095000538 2024-02-08T08:45:18Z Laboratory studies have shown that Antarctic krill ( Euphausia superba ) shrink if maintained in conditions of low food availability. Recent studies have also demonstrated that E. superba individuals may be shrinking in the field during winter. If krill shrink during the winter, conclusions reached by length-frequency analysis may be unreliable because smaller animals may not necessarily be younger animals. In this study, the correlation between the body-length and the crystalline cone number of the compound eye was examined. Samples collected in the late summer show an apparent linear relationship between crystalline cone number and body-length. From a laboratory population, it appears that when krill shrink the crystalline cone number remains relatively unchanged. If crystalline cone number is little affected by shrinking, then the crystalline cone number may be a more reliable indicator of age than body-length alone. The ratio of crystalline cone number to body-length offers a method for detecting the effect of shrinking in natural populations of krill. On the basis of the crystalline cone number count, it appears from a field collection in early spring that E. superba do shrink during winter. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Science Euphausia superba Cambridge University Press Antarctic Antarctic Science 7 4 387 392 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Sun, S. Mare, William De La Nicol, Stephen The compound eye as an indicator of age and shrinkage in Antarctic krill |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Laboratory studies have shown that Antarctic krill ( Euphausia superba ) shrink if maintained in conditions of low food availability. Recent studies have also demonstrated that E. superba individuals may be shrinking in the field during winter. If krill shrink during the winter, conclusions reached by length-frequency analysis may be unreliable because smaller animals may not necessarily be younger animals. In this study, the correlation between the body-length and the crystalline cone number of the compound eye was examined. Samples collected in the late summer show an apparent linear relationship between crystalline cone number and body-length. From a laboratory population, it appears that when krill shrink the crystalline cone number remains relatively unchanged. If crystalline cone number is little affected by shrinking, then the crystalline cone number may be a more reliable indicator of age than body-length alone. The ratio of crystalline cone number to body-length offers a method for detecting the effect of shrinking in natural populations of krill. On the basis of the crystalline cone number count, it appears from a field collection in early spring that E. superba do shrink during winter. |
format |
Article in Journal/Newspaper |
author |
Sun, S. Mare, William De La Nicol, Stephen |
author_facet |
Sun, S. Mare, William De La Nicol, Stephen |
author_sort |
Sun, S. |
title |
The compound eye as an indicator of age and shrinkage in Antarctic krill |
title_short |
The compound eye as an indicator of age and shrinkage in Antarctic krill |
title_full |
The compound eye as an indicator of age and shrinkage in Antarctic krill |
title_fullStr |
The compound eye as an indicator of age and shrinkage in Antarctic krill |
title_full_unstemmed |
The compound eye as an indicator of age and shrinkage in Antarctic krill |
title_sort |
compound eye as an indicator of age and shrinkage in antarctic krill |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0954102095000538 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000538 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Science Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Science Euphausia superba |
op_source |
Antarctic Science volume 7, issue 4, page 387-392 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102095000538 |
container_title |
Antarctic Science |
container_volume |
7 |
container_issue |
4 |
container_start_page |
387 |
op_container_end_page |
392 |
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1792504304698916864 |