in Antarctic krill, Euphausia superba
Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the e¡ect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspeci¢cs and whe...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.552.2579 2023-05-15T13:57:41+02:00 in Antarctic krill, Euphausia superba The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.2579 http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.2579 http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf text ftciteseerx 2016-01-08T11:36:47Z Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the e¡ect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspeci¢cs and when they were held at normal schooling distances (1 body length). Heart rate did not di¡er signi¢cantly with sex or body size. However, intermoult krill had a signi¢cantly lower heart rate than postmoult animals. When two individuals were held at schooling distance, with one slightly higher in the water column than the other, the heart rate of the higher individual slowed signi¢cantly (106^98 beats min71), while that of the lower individual remained the same.We interpret these results to mean that krill living solitarily are stressed but will respond to neighbouring individuals by decreasing their metabolic rate and saving energy. Only two authors have reported that Antarctic krill, Euphausia superba Dana, exhibited schooling behaviour when held in laboratory tanks (O’Brien, 1987; Strand & Hamner, 1990). This is surprising given that krill in the ¢eld invariably occur in schools from furcilia stage IV (Hamner et al., 1989). We have tried without success to induce schooling in this species. Since we were unable to achieve this, we resorted to tethering krill so Text Antarc* Antarctic Antarctic Krill Euphausia superba Unknown Antarctic |
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Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the e¡ect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspeci¢cs and when they were held at normal schooling distances (1 body length). Heart rate did not di¡er signi¢cantly with sex or body size. However, intermoult krill had a signi¢cantly lower heart rate than postmoult animals. When two individuals were held at schooling distance, with one slightly higher in the water column than the other, the heart rate of the higher individual slowed signi¢cantly (106^98 beats min71), while that of the lower individual remained the same.We interpret these results to mean that krill living solitarily are stressed but will respond to neighbouring individuals by decreasing their metabolic rate and saving energy. Only two authors have reported that Antarctic krill, Euphausia superba Dana, exhibited schooling behaviour when held in laboratory tanks (O’Brien, 1987; Strand & Hamner, 1990). This is surprising given that krill in the ¢eld invariably occur in schools from furcilia stage IV (Hamner et al., 1989). We have tried without success to induce schooling in this species. Since we were unable to achieve this, we resorted to tethering krill so |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
title |
in Antarctic krill, Euphausia superba |
spellingShingle |
in Antarctic krill, Euphausia superba |
title_short |
in Antarctic krill, Euphausia superba |
title_full |
in Antarctic krill, Euphausia superba |
title_fullStr |
in Antarctic krill, Euphausia superba |
title_full_unstemmed |
in Antarctic krill, Euphausia superba |
title_sort |
in antarctic krill, euphausia superba |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.2579 http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
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http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.2579 http://eprints.utas.edu.au/8357/1/Heart_rate_as_a_measure_of_stress_in_Antarctic_krill.pdf |
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1766265503011045376 |