Browsing by Author "Johnson, Mark P."
Now showing items 1-20 of 26
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A modelling approach to explore the critical environmental parameters influencing the growth and establishment of the invasive seaweed undaria pinnatifida in europe
Murphy, James T.; Johnson, Mark P.; Viard, Frédérique (Elsevier BV, 2016-05-01) -
A theoretical examination of environmental effects on the life cycle schedule and range limits of the invasive seaweed undaria pinnatifida
Murphy, James T.; Johnson, Mark P.; Viard, Frédérique (Springer Nature, 2017-01-09)Invasive macroalgae form a substantial component of marine invaders at a global level. However, it is poorly understood how the complex interactions between local environmental conditions and life cycle dynamics contribute ... -
A vertical wall dominated by acesta excavata and neopycnodonte zibrowii, part of an undersampled group of deep-sea habitats
Johnson, Mark P.; White, Martin; Wilson, Annette; Würzberg, Laura; Schwabe, Enrico; Folch, Helka; Allcock, A. Louise (Public Library of Science (PLoS), 2013-11-18)We describe a novel biotope at 633 to 762 m depth on a vertical wall in the Whittard Canyon, an extensive canyon system reaching from the shelf to the deep sea on Ireland's continental margin. We explored this wall with ... -
Algal epiphytes of Zostera marina: variation in assemblage structure from individual leaves to regional scale
Johnson, Mark P. (Elsevier, 2005)Algal epiphytes can be an important component of seagrass ecosystems, but spatial variability in epiphyte assemblages has not often been characterised. Data from a hierarchical study of four Zostera marina beds in Wales ... -
Assessment and characterisation of ireland's green tides (ulva species)
Wan, Alex H. L.; Wilkes, Robert J.; Heesch, Svenja; Bermejo, Ricardo; Johnson, Mark P.; Morrison, Liam (Public Library of Science (PLoS), 2017-01-03)Enrichment of nutrients and metals in seawater associated with anthropogenic activities can threaten aquatic ecosystems. Consequently, nutrient and metal concentrations are parameters used to define water quality. The ... -
Characterising the marine Natura 2000 network for the Atlantic region
Johnson, Mark P. (John Wiley & Sons, Ltd., 2008)1. One of the goals for Natura 2000, a key European Community programme of nature conservation, is to produce a network of protected areas. An analysis of the Natura 2000 marine sites proposed in the most recently agreed ... -
Characterization of polymorphic microsatellites for the rough periwinkle gastropod, littorina saxatilis (olivi, 1792) and their cross-amplification in four congeners
McInerney, Caitríona E.; Louise Allcock, A.; Johnson, Mark P.; Prodöhl, Paulo A. (Springer Nature, 2009-03-10)Eight new microsatellite loci were characterized for Littorina saxatilis (Olivi, 1792) and tested for their cross-hybridization in congeners. All loci were polymorphic in Irish and Celtic Sea samples, with an average number ... -
Coastline configuration disrupts the effects of large-scale climatic forcing, leading to divergent temporal trends in wave exposure
Johnson, Mark P. (Elsevier, 2006)Both climate change and the North Atlantic Oscillation (NAO) may influence coastal systems by altering wave exposure. The effects of such climatic forcing are often coherent over relatively large geographic areas. Temporal ... -
Continental shelf-wide response of a fish assemblage to rapid warming of the sea
Simpson, Stephen D.; Jennings, Simon; Johnson, Mark P.; Blanchard, Julia L.; Schön, Pieter-Jan; Sims, David W.; Genner, Martin J. (Elsevier BV, 2011-09-01)Climate change affects marine biological processes from genetic to ecosystem levels [1-3]. Recent warming in the northeast Atlantic [4, 5] has caused distributional shifts in some fish species along latitudinal and depth ... -
Dispersal mode and assessments of recovery on the shores of Gruinard, the 'anthrax island'.
Johnson, Mark P. (Springer Verlag, 2008)Formaldehyde run-off was an unintended impact of the anthrax decontamination procedure on the island of Gruinard. The death of intertidal organisms was observed where formaldehyde reached the shore during 1986. The extent ... -
Ecosystem services and environmental impacts associated with commercial kelp aquaculture
Walls, Aimée M. (2017-07-11)Wild kelp forests represent one of the most productive habitats on Earth, suppling ecosystem services, including, but not limited to, biodiversity, habitat provision, food web subsidy, nutrient cycling, carbon sequestration ... -
Growth in nephrops norvegicus from a tag-recapture experiment
Haynes, Paula S.; Browne, Patricia; Fullbrook, Liam; Graham, Conor T.; Hancox, Lee; Johnson, Mark P.; Lauria, Valentina; Power, Anne Marie (Springer Nature, 2016-10-11)Nephrops norvegicus is a commercially valuable fishery in the EU but management of stocks is challenging due to difficulties in aging individuals and calculating growth and biomass production. Growth of N. norvegicus was ... -
Impact of kelp cultivation on the Ecological Status of benthic habitats and Zostera marina seagrass biomass
Walls, Aimee W.; Kennedy, Robert; Edwards, Maeve D.; Johnson, Mark P. (Elsevier, 2017-07-25)The Ecological Status of subtidal benthic communities within a commercial kelp farm on the southwest coast of Ireland was not impacted by macroalgal cultivation. Additionally, there was no effect on the biomass of Zostera ... -
Interactions in the deep sea
Allcock, A. Louise; Johnson, Mark P. (Cambridge University Press, 2019-08)The deep–ocean floor extends over two thirds of the world’s surface, and is thus the largest benthic habitat on the planet. The myth of depauperate deep–sea communities was debunked in the 1960s by the pioneering wor ... -
Landscape effects in the intertidal around the coastline of Great Britain
Johnson, Mark P.; Maggs, Christine A.; Allcock, A. Louise; Blight, Andrew J. (Wiley, 2015-12-21)Aim We tested whether the size of habitat patches along the coastline of Great Britain influences molluscan species richness.Location Coastline of Great Britain.Methods Intertidal mollusc data were compiled from the National ... -
Landscape effects in the intertidal around the coastline of great britain
Johnson, Mark P.; Maggs, Christine A.; Allcock, A. Louise; Blight, Andrew J. (Wiley-Blackwell, 2015-09-25)Aim We tested whether the size of habitat patches along the coastline of Great Britain influences molluscan species richness. Location Coastline of Great Britain. Methods Intertidal mollusc data were compiled from the ... -
Like a rolling stone: the mobility of maerl (corallinaceae) and the neutrality of the associated assemblages.
Johnson, Mark P. (Ecological Society of America, 2008)Beds of non-attached coralline algae (maerl or rhodoliths) are widespread and considered relatively species rich. This habitat is generally found in areas where there is chronic physical disturbance such that maerl thalli ... -
Modelling the shoaling behaviour of pelagic fishes to improve acoustic stock assessment methods
Wassermann, Sophia Nell (NUI Galway, 2021-04-21)Creating a model of collective behaviours, such as a fish shoal, requires understanding the movements and interactions of the individuals within. Individual-based models (IBMs), which consist of autonomous agents interacting ... -
The persistent spatial patchiness of limpet grazing
Johnson, Mark P. (Elsevier, 2008)The characteristic variability of grazing has potential consequences for intertidal productivity and community structure, particularly as many of the underlying functional relationships are thought to be non linear. As a ... -
Phlorotannins, current and future implications for the seaweed industry
Quéguineur, Benoît Louis Erwan (2012-09-28)This thesis focuses on phenolic compounds from brown macroalgae, named phlorotannins, and their current and future implication in the seaweed industry. After an examination of the phlorotannins content and in vitro ...