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Heart rate as a measure of stress in Antarctic krill, Euphausia superba

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Version 2 2023-06-23, 11:05
Version 1 2023-05-26, 11:11
journal contribution
posted on 2023-06-23, 11:05 authored by DA Ritz, L Newman, Kerrie SwadlingKerrie Swadling, S Nicol, Jonathan OsbornJonathan Osborn
Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the effect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspecifics and when they were held at normal schooling distances (∼1 body length). Heart rate did not differ significantly with sex or body size. However, intermoult krill had a significantly 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 significantly (106-98 beats min-1), 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.

History

Publication title

Journal of the Marine Biological Association of the United Kingdom

Volume

83

Issue

2

Pagination

329-330

ISSN

0025-3154

Department/School

Geography, Planning and Spatial Sciences, Sustainable Marine Research Collaboration

Publisher

Cambridge University Press

Publication status

  • Published

Rights statement

Copyright 2003 Cambridge University Press

Repository Status

  • Open

Socio-economic Objectives

180404 Biodiversity in Antarctic and Southern Ocean environments

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