Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba
The filtering basket of Euphausia superba is a complex comb filter with a wide range of mesh intervals. Intersetal distances range from approximately 15–95 μm between primary setae to 4–18 μm between secondary setae (setules). Microsetules with spacing of 1–2 μm thicken boundary layers surrounding s...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1983
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Online Access: | http://dx.doi.org/10.1139/f83-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-122 |
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crcansciencepubl:10.1139/f83-122 2024-09-15T17:45:38+00:00 Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba McClatchie, Sam Boyd, Carl M. 1983 http://dx.doi.org/10.1139/f83-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-122 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 7, page 955-967 ISSN 0706-652X 1205-7533 journal-article 1983 crcansciencepubl https://doi.org/10.1139/f83-122 2024-08-01T04:10:02Z The filtering basket of Euphausia superba is a complex comb filter with a wide range of mesh intervals. Intersetal distances range from approximately 15–95 μm between primary setae to 4–18 μm between secondary setae (setules). Microsetules with spacing of 1–2 μm thicken boundary layers surrounding secondary setae. Reynolds numbers for setules and microsetules, ranging from 0.006 to 0.95, limit the feeding modes available to E. superba for suspension feeding. Relative efficiency of particle capture, estimated from intersetule mesh size and grazing experiments with small phytoplankton (< 30 μm), show an asymptotic efficiency for particles 12–28 μm. Setule frequency distribution conservatively characterizes particle size selection for these small particles. The fine structure of the mandibular pars molaris varies between krill species and shows specialized surfaces that can split diatom chains, cut or fracture hard tests, and grind particles smaller than 10 μm. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 40 7 955 967 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The filtering basket of Euphausia superba is a complex comb filter with a wide range of mesh intervals. Intersetal distances range from approximately 15–95 μm between primary setae to 4–18 μm between secondary setae (setules). Microsetules with spacing of 1–2 μm thicken boundary layers surrounding secondary setae. Reynolds numbers for setules and microsetules, ranging from 0.006 to 0.95, limit the feeding modes available to E. superba for suspension feeding. Relative efficiency of particle capture, estimated from intersetule mesh size and grazing experiments with small phytoplankton (< 30 μm), show an asymptotic efficiency for particles 12–28 μm. Setule frequency distribution conservatively characterizes particle size selection for these small particles. The fine structure of the mandibular pars molaris varies between krill species and shows specialized surfaces that can split diatom chains, cut or fracture hard tests, and grind particles smaller than 10 μm. |
format |
Article in Journal/Newspaper |
author |
McClatchie, Sam Boyd, Carl M. |
spellingShingle |
McClatchie, Sam Boyd, Carl M. Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
author_facet |
McClatchie, Sam Boyd, Carl M. |
author_sort |
McClatchie, Sam |
title |
Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
title_short |
Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
title_full |
Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
title_fullStr |
Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
title_full_unstemmed |
Morphological Study of Sieve Efficiencies and Mandibular Surfaces in the Antarctic Krill, Euphausia superba |
title_sort |
morphological study of sieve efficiencies and mandibular surfaces in the antarctic krill, euphausia superba |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/f83-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-122 |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 7, page 955-967 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f83-122 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
40 |
container_issue |
7 |
container_start_page |
955 |
op_container_end_page |
967 |
_version_ |
1810493519506178048 |