Browsing NIBIO Brage by Author "Roleda, Michael"
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Climate Change Impacts on Seagrass Meadows and Macroalgal Forests: An Integrative Perspective on Acclimation and Adaptation Potential
Duarte, Bernardo; Martins, Irene; Rosa, Rui; Matos, Ana R.; Roleda, Michael; Reusch, Thorsten B. H.; Engelen, Aschwin H.; Serrão, Ester A.; Pearson, Gareth A.; Marques, João C.; Caçador, Isabel; Duarte, Carlos M.; Jüterbock, Alexander Oliver (Journal article; Peer reviewed, 2018-06-04)Marine macrophytes are the foundation of algal forests and seagrass meadows–some of the most productive and diverse coastal marine ecosystems on the planet. These ecosystems provide nursery grounds and food for fish and ... -
Copper pollution exacerbates the effects of ocean acidification and warming on kelp microscopic early life stages
Leal, Pablo P.; Hurd, Catriona L.; Sander, Sylvia G.; Armstrong, Evelyn; Fernández, Pamela A.; Suhrhoff, Tim J.; Roleda, Michael (Journal article; Peer reviewed, 2018-10-03)Ocean warming (OW), ocean acidification (OA) and their interaction with local drivers, e.g., copper pollution, may negatively affect macroalgae and their microscopic life stages. We evaluated meiospore development of the ... -
Enrichment of the protein content of the macroalgae Saccharina latissima and Palmaria palmata
Aasen, Inga Marie; Sandbakken, Ingrid Schafroth; Toldnes, Bendik; Roleda, Michael; Slizyte, Rasa (Peer reviewed; Journal article, 2022-04-30)The large brown seaweeds (kelps) are potential sources of protein for animal feed. They have lower protein contents than most red and green algae, but due to potential for large-scale production, they may represent a ... -
Environmental controls on the elemental composition of a Southern Hemisphere strain of the coccolithophore Emiliania huxleyi
Feng, Yuanyuan; Roleda, Michael; Armstrong, Evelyn; Law, Cliff S.; Boyd, Philip W.; Hurd, Catriona L. (Journal article; Peer reviewed, 2018-01-30)A series of semi-continuous incubation experiments were conducted with the coccolithophore Emiliania huxleyi strain NIWA1108 (Southern Ocean isolate) to examine the effects of five environmental drivers (nitrate and phosphate ... -
In vitro evaluation of utilisable crude protein and methane production for a diet in which grass silage was replaced by different levels and fractions of extracted seaweed proteins
Ramin, Mohammad; Franco, Marcia; Roleda, Michael; Aasen, Inga Marie; Hetta, Mårten; Steinshamn, Håvard (Journal article; Peer reviewed, 2019)Utilisable crude protein (uCP), methane (CH4) production and other fermentation parameters were analysed in vitro for a diet in which grass silage was replaced by different levels of seaweed protein fractions prepared from ... -
Iodine content in bulk biomass of wild-harvested and cultivated edible seaweeds: Inherent variations determine species-specific daily allowable consumption
Roleda, Michael; Skjermo, Jorunn; Marfaing, Hélène; Jonsdottir, Rosa; Rebours, Celine; Gietl, Anna; Stengel, Dagmar; Nitschke, Udo (Journal article; Peer reviewed, 2018-07-15)This study represents a large-scale investigation into iodine contents in three commercially important and edible seaweed species from the North Atlantic: the brown algae Saccharina latissima and Alaria esculenta, and the ... -
Microscopic Stages of North Atlantic Laminaria digitata (Phaeophyceae) Exhibit Trait-Dependent Thermal Adaptation Along Latitudes
Schimpf, Nele M.; Liesner, Daniel; Franke, Kiara; Roleda, Michael; Bartsch, Inka (Peer reviewed; Journal article, 2022-06-17)Kelp forests in the North Atlantic are at risk of decline at their warm temperature distribution margins due to anthropogenic temperature rise and more frequent marine heat waves. To investigate the thermal adaptation of ... -
Occurrence and pathogenicity of Pythium (Oomycota) on Ulvaspecies (Chlorophyta) at different salinities
Herrero, Maria-Luz; Brurberg, May Bente; Alayon, Dario Isidro Ojeda; Roleda, Michael (Peer reviewed; Journal article, 2020-02-25)Pythium species are ubiquitous organisms known to be pathogens to terrestrial plants and marine algae. While several Pythium species (hereafter, Pythium) are described as pathogens to marine red algae, little is known about ... -
Summer Heatwave Impacts on the European Kelp Saccharina latissima Across Its Latitudinal Distribution Gradient
Diehl, Nora; Roleda, Michael; Bartsch, Inka; Karsten, Ulf; Bischof, Kai (Peer reviewed; Journal article, 2021-10-11)Kelps are important foundation species in coastal ecosystems currently experiencing pronounced shifts in their distribution patterns caused by ocean warming. While some populations found at species’ warm distribution edges ... -
Variations in polyphenol and heavy metal contents of wild-harvested and cultivated seaweed bulk biomass: Health risk assessment and implication for food applications
Roleda, Michael; Marfaing, Hélène; Desnica, Natasa; Jónsdóttir, Rósa; Skjermo, Jorunn; Rebours, Celine; Nitschke, Udo (Journal article; Peer reviewed, 2018-07-27)Seaweeds are increasingly used in European cuisines due to their nutritional value. Many algal constituents, such as polyphenols, are important antioxidants and thus considered beneficial to humans. However, many seaweed ...