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Dr Magnus Johnson

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Magnus Johnson

Senior Lecturer in Environmental Marine Science


The effects of temporary exclusion of activity due to wind farm construction on a lobster (Homarus gammarus) fishery suggests a potential management approach (2018)
Journal Article
Roach, M., Cohen, M., Forster, R., Revill, A. S., & Johnson, M. (2018). The effects of temporary exclusion of activity due to wind farm construction on a lobster (Homarus gammarus) fishery suggests a potential management approach. ICES journal of marine science : journal du conseil, 75(4), 1416-1426. https://doi.org/10.1093/icesjms/fsy006

Offshore wind farms form an important part of many countries strategy for responding to the threat of climate change but their development can conflict with other offshore activities. Static gear fisheries targeting sedentary benthic species are par... Read More about The effects of temporary exclusion of activity due to wind farm construction on a lobster (Homarus gammarus) fishery suggests a potential management approach.

Stress response according to transport protocol in Norway lobster, Nephrops norvegicus (2017)
Journal Article
Powell, A., Cowing, D. M., Eriksson, S. P., & Johnson, M. L. (2017). Stress response according to transport protocol in Norway lobster, Nephrops norvegicus. Crustacean research, 46, 17-24. https://doi.org/10.18353/crustacea.46.0_17

The Norway lobster, Nephrops norvegicus, is a valuable and commonly exported European decapod crustacean, which experiences stress from point of capture and onward transport. Stressors such as air exposure duration (i.e. emersion period) and air temp... Read More about Stress response according to transport protocol in Norway lobster, Nephrops norvegicus.

Population dynamics of two sympatric intertidal fish species (the shanny, Lipophrys pholis, and long-spined scorpion fish,Taurulus bubalis) of Great Britain (2016)
Journal Article
Barrett, C., Johnson, M., & Hull, S. (2018). Population dynamics of two sympatric intertidal fish species (the shanny, Lipophrys pholis, and long-spined scorpion fish,Taurulus bubalis) of Great Britain. Journal of the Marine Biological Association of the UK, 98(3), 589-595. https://doi.org/10.1017/s0025315416001582

The shanny/common blenny (Lipophrys pholis) and long-spined scorpionfish/bullhead (Taurulus bubalis) are commonly encountered, sympatric species within much of Great Britain’s rocky intertidal zones. Despite being prey items of the cod (Gadus morhua)... Read More about Population dynamics of two sympatric intertidal fish species (the shanny, Lipophrys pholis, and long-spined scorpion fish,Taurulus bubalis) of Great Britain.

Artificial reefs and marine protected areas: a study in willingness to pay to access Folkestone Marine Reserve, Barbados, West Indies (2016)
Journal Article
Kirkbride-Smith, A. E., Wheeler, P. M., & Johnson, M. L. (2016). Artificial reefs and marine protected areas: a study in willingness to pay to access Folkestone Marine Reserve, Barbados, West Indies. PeerJ, 4, https://doi.org/10.7717/peerj.2175

Artificial reefs in marine protected areas provide additional habitat for biodiversity viewing, and therefore may offer an innovative management solution for managing for coral reef recovery and resilience. Marine park user fees can generate revenue... Read More about Artificial reefs and marine protected areas: a study in willingness to pay to access Folkestone Marine Reserve, Barbados, West Indies.

Insights into the morphology of symbiotic shrimp eyes (Crustacea, Decapoda, Palaemonidae); the effects of habitat demands (2016)
Journal Article
Dobson, N. C., Johnson, M. L., & De Grave, S. (2016). Insights into the morphology of symbiotic shrimp eyes (Crustacea, Decapoda, Palaemonidae); the effects of habitat demands. PeerJ, 4, https://doi.org/10.7717/peerj.1926

Morphometric differences in the optical morphology of symbiotic palaemonid shrimps can be observed among species symbiotic with different host organisms. Discriminant functional analysis revealed three distinct groups within the species examined. Of... Read More about Insights into the morphology of symbiotic shrimp eyes (Crustacea, Decapoda, Palaemonidae); the effects of habitat demands.

Diet as a mechanism of coexistence between intertidal fish species of the U.K. (2015)
Journal Article
Barrett, C. J., Johnson, M. L., & Hull, S. L. (2016). Diet as a mechanism of coexistence between intertidal fish species of the U.K. Hydrobiologia, 768(1), 125-135. doi:10.1007/s10750-015-2537-1

While the syntopic nature of many intertidal fish communities suggest that resources such as food are shared, little has been done to assess the importance of diet on the coexistence of intertidal fish of the U.K. In this study, six intertidal fish s... Read More about Diet as a mechanism of coexistence between intertidal fish species of the U.K..

External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations (2015)
Journal Article
Johnson, M. L., Dobson, N., & De Grave, S. (2015). External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations. PeerJ, 3(8), e1176. https://doi.org/10.7717/peerj.1176

Most caridean decapods have compound eyes of the reflecting superposition kind, and additionally some possess an accessory eye-like organ of unknown function, also referred to as the nebenauge.We examined 308 caridean genera to assess the general mor... Read More about External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations.

Preliminary observations on the mandibles of palaemonoid shrimp (Crustacea: Decapoda: Caridea: Palaemonoidea) (2015)
Journal Article
Ashelby, C. W., De Grave, S., & Johnson, M. L. (2015). Preliminary observations on the mandibles of palaemonoid shrimp (Crustacea: Decapoda: Caridea: Palaemonoidea). PeerJ, 2015(3), e846. doi:10.7717/peerj.846

The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology of the group. Within the Palaemonoidea the mandibles reach a high level of structural diversity reflecting the diverse lifestyles within the superfamily... Read More about Preliminary observations on the mandibles of palaemonoid shrimp (Crustacea: Decapoda: Caridea: Palaemonoidea).

Evaluation of different concentration doses of eugenol on the behaviour of Nephrops norvegicus (2015)
Journal Article
Cowing, D., Powell, A., & Johnson, M. (2015). Evaluation of different concentration doses of eugenol on the behaviour of Nephrops norvegicus. Aquaculture, 442, 78-85. doi:10.1016/j.aquaculture.2015.02.039

Eugenol was tested for use as an anaesthetic on Nephrops norvegicus at three different concentrations (300, 600, 900 μL/L). Monitoring included the time taken to reach each sedation stage. Sedation stage was assessed by passive behaviours and reactio... Read More about Evaluation of different concentration doses of eugenol on the behaviour of Nephrops norvegicus.

The first use of Fulton's K for assessing and comparing the conditions of inter-tidal fish populations (2014)
Journal Article
Barrett, C. J., Johnson, M., Hall, N. J., & Hull, S. (2016). The first use of Fulton's K for assessing and comparing the conditions of inter-tidal fish populations. Marine Ecology, 37(1), 42-45. https://doi.org/10.1111/maec.12234

Fulton's K condition factor was applied, for the first time, to inter-tidal specimens of the shanny (Lipophrys pholis) and long-spined scorpion fish (Taurulus bubalis) from two English rocky shore and two Welsh rocky shore sites during summer 2010 an... Read More about The first use of Fulton's K for assessing and comparing the conditions of inter-tidal fish populations.