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Dr Magnus Johnson

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Magnus Johnson

Senior Lecturer in Environmental Marine Science


Diverging strategies to planning an ecologically coherent network of MPAs in the North Sea : The roles of advocacy, evidence and pragmatism in the face of uncertainty (2014)
Journal Article
Caveen, A. J., Fitzsimmons, C., Pieraccini, M., Dunn, E., Sweeting, C. J., Johnson, M. L., …Polunin, N. V. (2014). Diverging strategies to planning an ecologically coherent network of MPAs in the North Sea : The roles of advocacy, evidence and pragmatism in the face of uncertainty. Advances in Marine Biology, 69, 325-370. https://doi.org/10.1016/B978-0-12-800214-8.00009-8

The North Sea is one of the most economically important seas in the world due to productive fisheries, extensive oil and gas fields, busy shipping routes, marine renewable energy development and recreational activity. Unsurprisingly, therefore, the u... Read More about Diverging strategies to planning an ecologically coherent network of MPAs in the North Sea : The roles of advocacy, evidence and pragmatism in the face of uncertainty.

Linking eye design with host symbiont relationships in pontoniine shrimps (crustacea, decapoda, palaemonidae) (2014)
Journal Article
Dobson, N. C., De Grave, S., & Johnson, M. L. (2014). Linking eye design with host symbiont relationships in pontoniine shrimps (crustacea, decapoda, palaemonidae). PloS one, 9(6), e99505. doi:10.1371/journal.pone.0099505

Symbiosis is prevalent in the marine environment with many studies examining the effects of such interactions between host and symbiont. Pontoniine shrimps are a group whose ecology is characterised by symbiotic interactions. This investigation exami... Read More about Linking eye design with host symbiont relationships in pontoniine shrimps (crustacea, decapoda, palaemonidae).

The reniform reflecting superposition compound eyes of Nephrops norvegicus: optics, susceptibility to light-induced damage, electrophysiology and a ray tracing model (2013)
Book Chapter
Gaten, E., Moss, S., & Johnson, M. L. (2013). The reniform reflecting superposition compound eyes of Nephrops norvegicus: optics, susceptibility to light-induced damage, electrophysiology and a ray tracing model. In Advances in Marine Biology; The Ecology and Biology of Nephrops norvegicus, 107-148. Elsevier. https://doi.org/10.1016/b978-0-12-410466-2.00004-2

The large reniform eyes of the reptant, tube-dwelling decapod Nephrops norvegicus are described in detail. Optically these reflecting superposition compound eyes are a little unusual in that they are laterally flattened, a feature that may enhance th... Read More about The reniform reflecting superposition compound eyes of Nephrops norvegicus: optics, susceptibility to light-induced damage, electrophysiology and a ray tracing model.

Regional scale speciation reveals multiple invasions of freshwater in Palaemoninae (Decapoda) (2012)
Journal Article
Ashelby, C. W., Page, T. J., De Grave, S., Johnson, M. L., Hughes, J. M., & Johnson, M. (2012). Regional scale speciation reveals multiple invasions of freshwater in Palaemoninae (Decapoda). Zoologica Scripta, 41(3), 293-306. doi:10.1111/j.1463-6409.2012.00535.x

The generic level, systematic relationship in Palaemoninae was inferred from analyses based on the mitochondrial 16S rDNA and nuclear Histone (H3) genes, primarily focussed on the genera Palaemon and Palaemonetes, as previous morphological and molecu... Read More about Regional scale speciation reveals multiple invasions of freshwater in Palaemoninae (Decapoda).

On the presence of Thorella cobourgi Bruce, 1982 (Decapoda, Hippolytidae) in the Gulf of Aqaba, Red Sea (2011)
Journal Article
Johnson, M. (2011). On the presence of Thorella cobourgi Bruce, 1982 (Decapoda, Hippolytidae) in the Gulf of Aqaba, Red Sea. Crustaceana, 84(9), 1149 - 1151. https://doi.org/10.1163/001121611X584280

The hippolytid genus Thorella Bruce, 1982 was described from specimens collected from Port Essington on the Cobourg Peninsula and a further location in Darwin, both in the Northern Territory (Australia), with Thorella cobourgi Bruce, 1982 as the only... Read More about On the presence of Thorella cobourgi Bruce, 1982 (Decapoda, Hippolytidae) in the Gulf of Aqaba, Red Sea.

Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars) (2010)
Book Chapter
Gaten, E., Wiese, K., & Johnson, M. L. (2010). Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars). In Advances in Marine Biology, 231-253. Elsevier. doi:10.1016/B978-0-12-381308-4.00008-X

The behaviour of planktonic animals remains poorly understood due to the difficulty of observing them in situ without influencing their behaviour. Here we review experiments on the behavioural responses of Northern krill, Meganyctiphanes norvegica (a... Read More about Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars).

Experience matters: Females use smell to select experienced males for paternal care (2009)
Journal Article
Fletcher, N., Storey, E. J., Johnson, M., Reish, D. J., & Hardege, J. D. (2009). Experience matters: Females use smell to select experienced males for paternal care. PloS one, 4(11), e7672. doi:10.1371/journal.pone.0007672

Mate choice and mating preferences often rely on the information content of signals exchanged between potential partners. In species where a female's reproduction is the terminal event in life it is to be expected that females choose high quality mal... Read More about Experience matters: Females use smell to select experienced males for paternal care.

Egg-release behaviour in Antarctic krill (2009)
Journal Article
Tarling, G. A., Cuzin-Roudy, J., Wootton, K., & Johnson, M. (2009). Egg-release behaviour in Antarctic krill. Polar Biology, 32(8), (1187-1194). doi:10.1007/s00300-009-0617-2. ISSN 0722-4060

The process of egg release is a complex and crucial step in the life cycle of euphausiids, especially with regards mortality and recruitment success. We examined this process in Antarctic krill (Euphausia superba) in terms of the functioning of the f... Read More about Egg-release behaviour in Antarctic krill.

Fighting behaviour and the role of urinary signals in dominance assessment of Norway lobsters, Nephrops norvegicus (2008)
Journal Article
Breithaupt, T., Johnson, M., & Katoh, E. (2008). Fighting behaviour and the role of urinary signals in dominance assessment of Norway lobsters, Nephrops norvegicus. Behaviour, 145(10), 1447-1464. doi:10.1163/156853908785765917

Norway lobsters, Nephrops norvegicus, live on the bottom of the continental shelf where they construct and defend burrows. Little is known about their agonistic behaviour and potential mechanisms of dominance. This paper investigates fighting behavio... Read More about Fighting behaviour and the role of urinary signals in dominance assessment of Norway lobsters, Nephrops norvegicus.

Influence of individual state on swimming capacity and behaviour of Antarctic krill Euphausia superba (2008)
Journal Article
Johnson, M. L., & Tarling, G. A. (2008). Influence of individual state on swimming capacity and behaviour of Antarctic krill Euphausia superba. Marine ecology progress series, 366, 99-110. doi:10.3354/meps07533

Swarms of Antarctic krill are frequently biased towards certain body sizes, sexes, maturities and physiological states. However, the mechanisms causing such biases remain unclear, with some speculating on differential responses to chemical or visual... Read More about Influence of individual state on swimming capacity and behaviour of Antarctic krill Euphausia superba.