The hydrodynamic disturbances of two species of krill: implications for aggregation structure
Krill aggregations vary in size, krill density and uniformity depending on the species of krill. These aggregations may be structured to allow individuals to sense the hydrodynamic cues of neighboring krill or to avoid the flow fields of neighboring krill, which may increase drag forces on an indivi...
Published in: | Journal of Experimental Biology |
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fthighwire:oai:open-archive.highwire.org:jexbio:214/11/1845 2023-05-15T16:08:28+02:00 The hydrodynamic disturbances of two species of krill: implications for aggregation structure Catton, Kimberly B. Webster, Donald R. Kawaguchi, So Yen, Jeannette 2011-06-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/214/11/1845 https://doi.org/10.1242/jeb.050997 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/214/11/1845 http://dx.doi.org/10.1242/jeb.050997 Copyright (C) 2011, Company of Biologists Research Articles TEXT 2011 fthighwire https://doi.org/10.1242/jeb.050997 2013-05-27T12:24:19Z Krill aggregations vary in size, krill density and uniformity depending on the species of krill. These aggregations may be structured to allow individuals to sense the hydrodynamic cues of neighboring krill or to avoid the flow fields of neighboring krill, which may increase drag forces on an individual krill. To determine the strength and location of the flow disturbance generated by krill, we used infrared particle image velocimetry measurements to analyze the flow field of free-swimming solitary specimens ( Euphausia superba and Euphausia pacifica ) and small, coordinated groups of three to six E. superba. Euphausia pacifica individuals possessed shorter body lengths, steeper body orientations relative to horizontal, slower swimming speeds and faster pleopod beat frequencies compared with E. superba . The downward-directed flow produced by E. pacifica has a smaller maximum velocity and smaller horizontal extent of the flow pattern compared with the flow produced by E. superba , which suggests that the flow disturbance is less persistent as a potential hydrodynamic cue for E. pacifica . Time record analysis reveals that the hydrodynamic disturbance is very weak beyond two body lengths for E. pacifica , whereas the hydrodynamic disturbance is observable above background level at four body lengths for E. superba . Because the nearest neighbor separation distance of E. superba within a school is less than two body lengths, hydrodynamic disturbances are a viable cue for intraspecies communication. The orientation of the position of the nearest neighbor is not coincident with the orientation of the flow disturbance, however, which indicates that E. superba are avoiding the region of strongest flow. Text Euphausia superba HighWire Press (Stanford University) Journal of Experimental Biology 214 11 1845 1856 |
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Research Articles |
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Research Articles Catton, Kimberly B. Webster, Donald R. Kawaguchi, So Yen, Jeannette The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
topic_facet |
Research Articles |
description |
Krill aggregations vary in size, krill density and uniformity depending on the species of krill. These aggregations may be structured to allow individuals to sense the hydrodynamic cues of neighboring krill or to avoid the flow fields of neighboring krill, which may increase drag forces on an individual krill. To determine the strength and location of the flow disturbance generated by krill, we used infrared particle image velocimetry measurements to analyze the flow field of free-swimming solitary specimens ( Euphausia superba and Euphausia pacifica ) and small, coordinated groups of three to six E. superba. Euphausia pacifica individuals possessed shorter body lengths, steeper body orientations relative to horizontal, slower swimming speeds and faster pleopod beat frequencies compared with E. superba . The downward-directed flow produced by E. pacifica has a smaller maximum velocity and smaller horizontal extent of the flow pattern compared with the flow produced by E. superba , which suggests that the flow disturbance is less persistent as a potential hydrodynamic cue for E. pacifica . Time record analysis reveals that the hydrodynamic disturbance is very weak beyond two body lengths for E. pacifica , whereas the hydrodynamic disturbance is observable above background level at four body lengths for E. superba . Because the nearest neighbor separation distance of E. superba within a school is less than two body lengths, hydrodynamic disturbances are a viable cue for intraspecies communication. The orientation of the position of the nearest neighbor is not coincident with the orientation of the flow disturbance, however, which indicates that E. superba are avoiding the region of strongest flow. |
format |
Text |
author |
Catton, Kimberly B. Webster, Donald R. Kawaguchi, So Yen, Jeannette |
author_facet |
Catton, Kimberly B. Webster, Donald R. Kawaguchi, So Yen, Jeannette |
author_sort |
Catton, Kimberly B. |
title |
The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
title_short |
The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
title_full |
The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
title_fullStr |
The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
title_full_unstemmed |
The hydrodynamic disturbances of two species of krill: implications for aggregation structure |
title_sort |
hydrodynamic disturbances of two species of krill: implications for aggregation structure |
publisher |
Company of Biologists |
publishDate |
2011 |
url |
http://jeb.biologists.org/cgi/content/short/214/11/1845 https://doi.org/10.1242/jeb.050997 |
genre |
Euphausia superba |
genre_facet |
Euphausia superba |
op_relation |
http://jeb.biologists.org/cgi/content/short/214/11/1845 http://dx.doi.org/10.1242/jeb.050997 |
op_rights |
Copyright (C) 2011, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.050997 |
container_title |
Journal of Experimental Biology |
container_volume |
214 |
container_issue |
11 |
container_start_page |
1845 |
op_container_end_page |
1856 |
_version_ |
1766404525398163456 |