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Dr Magnus Johnson


Lipophrys pholis is larger, grows faster and is in better condition in protected than in unprotected rocky shores (2024)
Journal Article
Compaire, J. C., Visintini, N., Soriguer, M. C., Johnson, M. L., Hull, S. L., & Barrett, C. J. (2024). Lipophrys pholis is larger, grows faster and is in better condition in protected than in unprotected rocky shores. Aquatic conservation : marine and freshwater ecosystems, 34(2), Article e4083. https://doi.org/10.1002/aqc.4083

Intertidal fish are a key component of littoral food webs, contributing to the diets of birds and commercial fish species. Ascertaining their growth and condition can therefore help understand the health status of local communities. Lipophrys pholis... Read More about Lipophrys pholis is larger, grows faster and is in better condition in protected than in unprotected rocky shores.

DNA metabarcoding reveals the dietary profiles of a benthic marine crustacean, Nephrops norvegicus (2023)
Journal Article
Shum, P., Wäge-Recchioni, J., Sellers, G. S., Johnson, M. L., & Joyce, D. A. (2023). DNA metabarcoding reveals the dietary profiles of a benthic marine crustacean, Nephrops norvegicus. PLoS ONE, 18(11 November), Article e0289221. https://doi.org/10.1371/journal.pone.0289221

Norwegian lobster, Nephrops norvegicus, are a generalist scavenger and predator capable of short foraging excursions but can also suspension feed. Existing knowledge about their diet relies on a combination of methods including morphology-based stoma... Read More about DNA metabarcoding reveals the dietary profiles of a benthic marine crustacean, Nephrops norvegicus.

Carbon and Lipid Contents of the Copepod Calanus finmarchicus Entering Diapause in the Fram Strait and Their Contribution to the Boreal and Arctic Lipid Pump (2022)
Journal Article
Tarling, G. A., Belcher, A., Blackwell, M., Castellani, C., Cook, K. B., Cottier, F. R., …Wootton, M. (2022). Carbon and Lipid Contents of the Copepod Calanus finmarchicus Entering Diapause in the Fram Strait and Their Contribution to the Boreal and Arctic Lipid Pump. Frontiers in Marine Science, 9, Article 926462. https://doi.org/10.3389/fmars.2022.926462

The boreal copepod Calanus finmarchicus sequesters substantial amounts of carbon (C) in the deep layers of the North Atlantic Ocean through their contribution to the “lipid pump.” This pump is driven by these zooplankton descending from the surface l... Read More about Carbon and Lipid Contents of the Copepod Calanus finmarchicus Entering Diapause in the Fram Strait and Their Contribution to the Boreal and Arctic Lipid Pump.

Can a key boreal Calanus copepod species now complete its life-cycle in the Arctic? Evidence and implications for Arctic food-webs (2021)
Journal Article
Tarling, G. A., Freer, J. J., Banas, N. S., Belcher, A., Blackwell, M., Castellani, C., …Wootton, M. (2022). Can a key boreal Calanus copepod species now complete its life-cycle in the Arctic? Evidence and implications for Arctic food-webs. AMBIO: A Journal of the Human Environment, 51(2), 333–344. https://doi.org/10.1007/s13280-021-01667-y

The changing Arctic environment is affecting zooplankton that support its abundant wildlife. We examined how these changes are influencing a key zooplankton species, Calanus finmarchicus, principally found in the North Atlantic but expatriated to the... Read More about Can a key boreal Calanus copepod species now complete its life-cycle in the Arctic? Evidence and implications for Arctic food-webs.

Morphology and reproduction in the Hapalocarcinus marsupialis Stimpson, 1859 species complex (Decapoda: Brachyura: Cryptochiridae) (2021)
Journal Article
Bähr, S., Johnson, M. L., Berumen, M. L., Hardenstine, R. S., Rich, W. A., & Van Der Meij, S. E. T. (2021). Morphology and reproduction in the Hapalocarcinus marsupialis Stimpson, 1859 species complex (Decapoda: Brachyura: Cryptochiridae). Journal of Crustacean Biology, 41(3), Article ruab052. https://doi.org/10.1093/jcbiol/ruab052

Symbiotic relationships contribute considerably to the high biodiversity found on coral reefs. Coral-dwelling gall crabs (Cryptochiridae) represent a prime example of coral-associated invertebrates that exhibit obligate relationships with their host.... Read More about Morphology and reproduction in the Hapalocarcinus marsupialis Stimpson, 1859 species complex (Decapoda: Brachyura: Cryptochiridae).

Moving Toward a Strategy for Addressing Climate Displacement of Marine Resources: A Proof-of-Concept (2020)
Journal Article
Mangano, M. C., Mieszkowska, N., Helmuth, B., Domingos, T., Sousa, T., Baiamonte, G., …Sarà, G. (2020). Moving Toward a Strategy for Addressing Climate Displacement of Marine Resources: A Proof-of-Concept. Frontiers in Marine Science, 7, Article 408. https://doi.org/10.3389/fmars.2020.00408

Realistic predictions of climate change effects on natural resources are central to adaptation policies that try to reduce these impacts. However, most current forecasting approaches do not incorporate species-specific, process-based biological infor... Read More about Moving Toward a Strategy for Addressing Climate Displacement of Marine Resources: A Proof-of-Concept.

Converting SACFOR data for statistical analysis: Validation, demonstration and further possibilities (2020)
Journal Article
Strong, J. A., & Johnson, M. (2020). Converting SACFOR data for statistical analysis: Validation, demonstration and further possibilities. Marine Biodiversity Records, 13(1), Article 2. https://doi.org/10.1186/s41200-020-0184-3

© 2020 The Author(s). Background: the context and purpose of the study: Semi-quantitative scales are often used for the rapid assessment of species composition and abundance during time-limited surveys. The semi-quantitative SACFOR abundance scale wa... Read More about Converting SACFOR data for statistical analysis: Validation, demonstration and further possibilities.

Home-made fish traps reduce the capture of small shannies (Lipophrys pholis) compared to using hand-nets in the UK (2020)
Journal Article
Barrett, C. J., Johnson, M. L., & Hull, S. L. (2020). Home-made fish traps reduce the capture of small shannies (Lipophrys pholis) compared to using hand-nets in the UK. Conservation Evidence Journal, 17, 32-34

A replicated, controlled study in 2011-2012 found that using home-made fish traps reduced the capture of unwanted, small shannies Lipophrys pholis compared to using conventional hand-nets in intertidal habitats.

Uneasy bedfellows: Fisheries and the search for space for marine conservation zones in english waters (2019)
Book Chapter
Rodmell, D., Caveen, A., & Johnson, M. L. (2020). Uneasy bedfellows: Fisheries and the search for space for marine conservation zones in english waters. In J. Humphreys, & R. W. Clark (Eds.), Marine Protected Areas: Science Policy and Management (99-112). Elsevier. https://doi.org/10.1016/B978-0-08-102698-4.00005-8

In contrast to the exclusion of human use considerations in MPA designation processes under the European nature directives, the distinct UK legal framework for Marine Conservation Zones (MCZs) permits social and economic factors in site selection dec... Read More about Uneasy bedfellows: Fisheries and the search for space for marine conservation zones in english waters.