Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
By I. Johnsen, Ø. Fiksen, A. Sandvik, L. Asplin. 2014
84 citations recorded by the source corpus.
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 trans- port. The rules governing vertical distributions include passive particles remaining fixed at con- stant depths, but also prescribed responses of active particles to environmental cues such as ambi- ent 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 pre- dicted 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 is required on the actual response of lice to a set of verti- cal environmental factors to improve predictions of lice dispersal in fjords.
Subfields: Ecology, Global and Planetary Change, Nature and Landscape Conservation
View Paper: https://www.semanticscholar.org/paper/f91d2a23f46cd0cb9c33a31fa6517a2bd42f8c06
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In Ecology
In Nature and Landscape Conservation
Citations in the corpus
- Production, mortality, and infectivity of planktonic larval sea lice, Lepeophtheirus salmonis (Krøyer, 1837): current knowledge and implications for epidemiological modelling (2018, methodology): “Where models incorporate larval mortality, for instance, they use a constant mortality at each larval stage, which may be kept constant (e.g. Aldrin et al., 2013; Johnsen et al., 2014) or vary according to salinity (e.”