Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system

The salmon louse Lepeophtheirus salmonis is a major parasite of salmon, and is able to travel between farms during its pelagic phases. We investigated the spatial dispersion of L. salmonis planktonic stages in the Hardangerfjord, Norway, using an individual-based model and a fjord circulation model....

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Autores principales:	IA Johnsen, Ø Fiksen, AD Sandvik, L Asplin
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d8f2b05fef4e4230b058e44e558f8f6e
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spelling	oai:doaj.org-article:d8f2b05fef4e4230b058e44e558f8f6e2021-11-17T10:10:25ZVertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system1869-215X1869-753410.3354/aei00098https://doaj.org/article/d8f2b05fef4e4230b058e44e558f8f6e2014-06-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v5/n2/p127-141/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534The salmon louse Lepeophtheirus salmonis is a major parasite of salmon, and is able to travel between farms during its pelagic phases. We investigated the spatial dispersion of L. salmonis planktonic stages in the Hardangerfjord, Norway, using an individual-based model and a fjord circulation model. The models allowed us to investigate how assumptions about swimming responses to environmental cues affect vertical distribution, development and horizontal transport. The rules governing vertical distributions include passive particles remaining fixed at constant depths, but also prescribed responses of active particles to environmental cues such as ambient light level, salinity and temperature. Horizontal dispersion was affected by the vertical distribution scheme (rules) of the particles (each representing an individual planktonic-stage L. salmonis). When particles were held fixed in the surface layer, the horizontal dispersion and the area potentially affected by a source of lice decreased relative to the distribution that was predicted when lice had vertical migration behaviours. The simulations also showed that swimming triggered by both light and temperature may result in a diel migration pattern. If the particles sought out the warmest areas during juvenile stages, development to the infectious stage was reduced by up to 1 d. Better information on the actual response lice have to a set of vertical environmental factors is needed to improve predictions of lice dispersal in fjords.IA JohnsenØ FiksenAD SandvikL AsplinInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 5, Iss 2, Pp 127-141 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 IA Johnsen Ø Fiksen AD Sandvik L Asplin Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
description	The salmon louse Lepeophtheirus salmonis is a major parasite of salmon, and is able to travel between farms during its pelagic phases. We investigated the spatial dispersion of L. salmonis planktonic stages in the Hardangerfjord, Norway, using an individual-based model and a fjord circulation model. The models allowed us to investigate how assumptions about swimming responses to environmental cues affect vertical distribution, development and horizontal transport. The rules governing vertical distributions include passive particles remaining fixed at constant depths, but also prescribed responses of active particles to environmental cues such as ambient light level, salinity and temperature. Horizontal dispersion was affected by the vertical distribution scheme (rules) of the particles (each representing an individual planktonic-stage L. salmonis). When particles were held fixed in the surface layer, the horizontal dispersion and the area potentially affected by a source of lice decreased relative to the distribution that was predicted when lice had vertical migration behaviours. The simulations also showed that swimming triggered by both light and temperature may result in a diel migration pattern. If the particles sought out the warmest areas during juvenile stages, development to the infectious stage was reduced by up to 1 d. Better information on the actual response lice have to a set of vertical environmental factors is needed to improve predictions of lice dispersal in fjords.
format	article
author	IA Johnsen Ø Fiksen AD Sandvik L Asplin
author_facet	IA Johnsen Ø Fiksen AD Sandvik L Asplin
author_sort	IA Johnsen
title	Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
title_short	Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
title_full	Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
title_fullStr	Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
title_full_unstemmed	Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
title_sort	vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/d8f2b05fef4e4230b058e44e558f8f6e
work_keys_str_mv	AT iajohnsen verticalsalmonlicebehaviourasaresponsetoenvironmentalconditionsanditsinfluenceonregionaldispersioninafjordsystem AT øfiksen verticalsalmonlicebehaviourasaresponsetoenvironmentalconditionsanditsinfluenceonregionaldispersioninafjordsystem AT adsandvik verticalsalmonlicebehaviourasaresponsetoenvironmentalconditionsanditsinfluenceonregionaldispersioninafjordsystem AT lasplin verticalsalmonlicebehaviourasaresponsetoenvironmentalconditionsanditsinfluenceonregionaldispersioninafjordsystem
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Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system

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