Michael Y. Roleda, Dr. rer. nat. – Professor


Dr. rer. nat. (Biology), University of Bremen, Germany

Research Interests:
Algal stress physiology; applied phycology; biodiversity; cultivation; ecophysiology; photobiology

Selected Publications:

  • Ramin M, Franco M, Roleda MY, Aasen IM, Hetta M, Steinshamn H. 2019. 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. Anim. Feed Sci. Technol., 255:114225.
  • Roleda MY, Hurd CL (2019) Seaweed nutrient physiology: Application of concepts to aquaculture and bioremediation. Phycologia 58:552-562.
  • de la Moneda A, Carro MD, Weisbjerg MR, Roleda MY, Lind V, Novoa.Garrido M, Molina-Alcaide E (2019) Variability and potential of seaweeds as ingredients of ruminant diets: an in vitro study. Animals 9:851.
  • Ryzhik I, Pugovkin D, Makarov M, Roleda MY, Basova L, Voskoboynikov G (2019) Tolerance of Fucus vesiculosus exposed to diesel water-accommodated fraction (WAF) and degradation of hydrocarbons by the associated bacteria. Environmental Pollution 254 B: UNSP 113072.
  • Roleda MY, Marfaing H, Desnica N, Jónsdóttir R, Skjermo J, Rebours C, Nitschke U (2019) Variations in polyphenol and heavy metal contents of wild-harvested and cultivated seaweed bulk biomass: Health risk assessment and implication for food applications. Food Control 95: 121-134.
  • Leal PP, Hurd CL, Sander SG, Armstrong E, Fernández PA, Suhrhoff TJ, Roleda MY (2018) Copper pollution exacerbates the effects of ocean acidification and warming on kelp microscopic early life stages. Scientific Reports 8:14763. DOI:10.1038/s41598-018-32899-w
  • Fernández PA, Roleda MY, Rautenberger R, Hurd CL (2018) Carbonic anhydrase activity in seaweeds: method overview and recommendations for measuring CA activity with an electrometric method, using Macrocystis pyrifera as model species. Marine Biology 165: 88.
  • Gaillard C, Bhatti HS, Novoa-Garrido M, Lind V, Roleda MY, Weisbjerg MR (2018) Amino acid profiles of different seaweed species and their in situ degradability in dairy cows. Animal Feed Science and Technology 241: 210-222. https://doi.org/10.1016/j.anifeedsci.2018.05.003
  • Roleda MY, Skjermo J, Marfaing, H, Jónsdóttir R, Rebours C, Gietl A, Stengel DB, Nitschke U (2018) Iodine content in bulk biomass of wild-harvested and cultivated edible seaweeds: Inherent variations determine species-specific daily allowable consumption. Food Chemistry 254: 333-33
  • Feng Y, Roleda MY, Boyd PW, Armstrong E, Law CS, Hurd CL (2018) Environmental controls on the elemental composition of a Southern Hemisphere strain of the coccolithopore Emiliania huxleyi. Biogeochemistry 15: 581-595.
  • Stévant P, Indergård E, Ólafsdóttir A, Marfaing H, Larssen WE, Fleurence J, Roleda MY, Rustad T, Slizyte R, Nordvedt TS (2018) Effects of drying on the nutrient content and physico-chemical and sensory characteristics of the edible kelp Saccharina latissima. Journal of Applied Phycology 30: 2587-2599.
  • Bjarnadóttir M, Aðalbjörnssona BV, Nilsson A, Slizyte R, Roleda MY, Hreggviðsson GO, Friðjónsson OH, Jónsdóttir R (2018) Palmaria palmata as an alternative protein source: Enzymatic protein extraction, amino acid composition, and nitrogen-to-protein conversion factor. Journal of Applied Phycology 30: 2061-2070.
  • Duarte B, Martins I, Rosa R, Matos AR, Roleda MY, Reusch T, Engelen AH, Serrão EA, Pearson GA, Marques JC, Caçador I, Duarte CM, Jüterbock A (2018) Climate change impacts on seagrass meadows and macroalgal forests: an integrative perspective on acclimation and adaptation potential. Frontiers in Marine Science 5: 190
  • Feng Y, Roleda MY, Boyd PW, Armstrong E, Hurd CL (2017) Environmental controls on the growth, photosynthetic and calcification rates of a Southern Hemisphere strain of the coccolithopore Emiliania huxleyi. Limnology and Oceanography 62: 519-540. DOI: 10.1002/lno.10442
  • Fernández PA, Roleda MY, Leal PP, Hurd CL (2017) Seawater pH, and not inorganic nitrogen source, affects pH at the blade surface of Macrocystis pyrifera: implications for responses of the giant kelp to future oceanic conditions. Physiologia plantarum 159: 107-119. DOI: 10.1111/ppl.12478
  • Fernández PA, Roleda MY, Leal PP, Hepburn C, Hurd CL (2017) Tissue nitrogen status does not alter the physiological responses of Macrocystis pyrifera to ocean acidification. Marine Biology 164: 177
  • Leal PP, Hurd CL, Fernández PA, Roleda MY (2017) Meiospore development of the kelps Macrocystis pyrifera and Undaria pinnatifida under ocean acidification and ocean warming: independent effects are more important than their interaction. Marine Biology 164: 7.
  • Leal PP, Hurd CL, Fernández PA, Roleda MY (2017) Ocean acidification and kelp development: reduced pH has no negative effects on meiospore germination and gametophytes development of Macrocystis pyrifera and Undaria pinnatifida. Journal of Phycology 53: 557-566. DOI: 10.1111/jpy.12518
  • Liu X, Bogaert K, Engelen A, Leliaert F, Roleda MY, de Clerck O (2017) Seaweed reproductive biology: environmental and genetic controls. Botanica Marina 60: 89-108. DOI: 10.1515/bot-2016-0091
  • Molina-Alcaide E, Carro MD, Roleda MY, Weisbjerg MR, Lind V, Novoa-Garrido M (2017) In vitro ruminal fermentation and methane production of different seaweed species. Animal Feed Science and Technology 228: 1-12. DOI:10.1016/j.anifeedsci.2017.03.012
  • Roleda MY (2016) Stress physiology and reproductive phenology of Arctic endemic kelp Laminaria solidungula J. Agardh. Polar Biology 39: 1967-1977. DOI: 10.1007/s00300-015-1813-x
  • Leal PP, Hurd CL, Sander SG, Armstrong E, Roleda MY (2016) Copper ecotoxicology of marine algae: a methodological appraisal. Chemistry and Ecology 32: 786-800. DOI:10.1080/02757540.2016.1177520
  • Leal PP, Hurd CL, Sander SG, Kortner B, Roleda MY (2016) Exposure to chronic and high dissolved copper concentrations impedes meiospore development of the kelps Macrocystis pyrifera and Undaria pinnatifida (Laminariales, Ochrophyta). Phycologia 55: 12-20. DOI: 10.2216/15-87.1
  • Boyd PW, Dillingham PW, McGraw CM, Armstrong EA, Cornwall CE, Feng Y, Hurd CL, Ringold-Gault M, Roleda MY, Timmins-Schiffman E, Nunn BL (2016) Physiological responses of a Southern Ocean diatom to complex future ocean conditions. Nature Climate Change 6: 207-213. DOI: 10.1038/NCLIMATE2811
  • Tayyab U, Novoa-Garrido M, Roleda MY, Lind V, Weisbjerg MR (2016) Ruminal and intestinal degradability of various seaweed species measured in situ in dairy cows. Animal Feed Science and Technology 213: 44-54. DOI: 10.1016/j.anifeedsci.2016.01.003
  • Bermúdez R, Feng Y, Roleda MY, Tatters AO, Hutchins DA, Larsen T, Boyd PW, Hurd CL, Riebesell U, Winder M (2015) Long-term conditioning to elevated pCO2 and warming influences the fatty and amino acid composition of the diatom Cylindrotheca fusiformis. PlosOne 10(5): e0123945. DOI: 10.1371/journal.pone.0123945
  • Fernández PA, Roleda MY, Hurd CL (2015) Effects of ocean acidification on the photosynthetic performance, carbonic anhydrase activity and growth of the giant kelp Macrocystis pyrifera. Photosynthesis Research 124: 293-304. DOI: 10.1007/s11120-015-0138-5
  • Rautenberger R, Fernández PA, Strittmatter M, Heesch S, Hurd CL, Roleda MY (2015) Saturating irradiance and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta). Ecology and Evolution 5:874-888. DOI: 10.1002/ece3.1382
  • Roleda MY, Cornwall CE, Feng Y, McGraw CM, Smith AM, Hurd CL (2015) Effect of ocean acidification and pH fluctuations on the growth and development of coralline algal recruits, and an associated benthic algal assemblage. PLoS ONE 10(10): e0140394. doi: 10.1371/journal.pone.0140394
  • Fernández PA, Hurd CL, Roleda MY (2014) Bicarbonate uptake via an anion exchange protein is the main mechanism of inorganic carbon acquisition by the giant kelp Macrocystis pyrifera (Laminariales, Phaeophyceae) under variable pH. Journal of Phycology. 50:998-1008. DOI: 10.1111/jpy.12247
  • Leal PP, Hurd CL, Roleda MY (2014) Meiospores produced in sori of nonsporophyllous laminae of Macrocystis pyrifera (Laminariales, Phaeophyceae) may enhance reproductive output. Journal of Phycology 50:400-405. DOI: 10.1111/jpy.12159
  • Pescheck F, Lohbeck KT, Roleda MY, Bilger W (2014) UVB-induced DNA and photosystem II damage in two intertidal green macroalgae: distinct survival strategies in UV-screening and non-screening Chlorophyta. Journal of Photochemistry and Photobiology B: Biology 132: 85-93. DOI: 10.1016/j.jphotobiol.2014.02.006
  • Roleda MY, Slocombe SP, Leakey RJG, Day JG, Bell EM, Stanley MS (2013) Effects of temperature and nutrient regimes on biomass and lipid production by six oleaginous microalgae in batch culture employing a two-phase cultivation strategy. Bioresource Technology 129: 439-449.
  • Tatters AO, Roleda MY, Schnetzer A, Fu F, Hurd CL, Boyd PW, Caron DA, Lie AAY, Hoffmann LJ, Hutchins DA (2013) Short- and long-term conditioning of a temperate marine diatom community to acidification and warming. Philosophical Transactions of the Royal Society B: Biological Sciences 368: art. No. 20120437
  • Roleda MY, Morris JN, McGraw CM, Hurd CL (2012) Ocean acidification and seaweed reproduction: increased CO2 ameliorates the negative effect of lowered pH on meiospore germination in the giant kelp Macrocystis pyrifera (Laminariales, Phaeophyceae). Global Change Biology 18: 854-864.
  • Roleda MY, Boyd PW, Hurd CL (2012) Before ocean acidification: calcifier chemistry lessons. Journal of Phycology 48: 840-843.
  • Roleda MY, Nyberg CD, Wulff A (2012) UVR defense mechanisms in eurytopic and invasive Gracilaria vermiculophylla (Gracilariales, Rhodophyta). Physiologia Plantarum, 146: 205-216.
  • Mohlin M, Roleda MY, Pattanaik B, Tenne SJ, Wulff A (2012) Interspecific resource competition – combined effects of radiation and nutrient limitation on two diazotrophic filamentous cyanobacteria. Microbial Ecology 63:736-750.
  • Holzinger A, Di Piazza L, Lütz C, Roleda MY (2011) Sporogenic and vegetative tissues of Saccharina latissima (Laminariales, Phaeophyceae) exhibit distinctive sensitivity to experimentally enhanced ultraviolet radiation: photosynthetically active radiation ratio. Phycological Research 59: 221-235.
  • Gruber A, Roleda MY, Bartsch I, Hanelt D, Wiencke C (2011) Sporogenesis under UVR in Laminaria digitata (Phaeophyceae) reveals protection of photosensitive meiospores within soral tissue: physiological and anatomical evidence. Journal of Phycology 47:603-614.
  • Roleda MY, Dethleff D (2011) Storm-generated sediment deposition on rocky shores: simulating burial effect on physiology and morphology of Saccharina latissima. Marine Biology Research 7:213-223.
  • Licuanan WY, Medina MLS, Luzon KS, Samson MS, Nañola CL, Rollon RN, Roleda MY (2011) Priority reef areas in the Pacific Coast of the Philippines for marine protected area deployment. Philippine Agricultural Scientist 94:62-78.
  • Roleda MY, Lütz-Meindl U, Wiencke C, Lütz C (2010) Physiological, biochemical and ultrastructural response of the Arctic turf macroalga Urospora penicilliformis (Ulothricales, Chlorophyta) to UV radiation. Protoplasma 243:105-116.
  • Roleda MY, Lüder UH, Wiencke C (2010) UV-susceptibility of zoospores of the brown macroalga Laminaria digitata from Spitsbergen. Polar Biology 33:577-588.
  • Pattanaik B, Wulff A, Roleda MY, Garde K, Mohlin M (2010) Production of cyanotoxin Nodularin- a multifactorial approach. Harmful Algae 10:30-38.
  • Roleda MY (2009) Photosynthetic response of Arctic kelp zoospores exposed to radiation and thermal stress. Photochemical & Photobiological Sciences 8:1302-1312.
  • Gómez I, Wulff A, Roleda MY, Huovinen P, Karsten U, Quartino ML, Dunton K, Wiencke C (2009) Light and temperature demands of benthic marine micro- and macroalgae in polar regions. Botanica Marina 52:593-608.
  • Karsten U, Wulff A, Roleda MY, Müller R, Steinhoff FS, Fredersdorf J, Wiencke C (2009) Physiological responses of polar benthic micro- and macroalgae to ultraviolet radiation. Botanica Marina 52:639-654.
  • Holzinger A, Roleda MY, Lütz C (2009) The vegetative arctic freshwater green alga Zygnema is insensitive to experimental UV exposure. Micron 40:831-838.
  • Roleda MY, Campana G, Wiencke C, Hanelt D, Quartino ML, Wulff A (2009) Sensitivity of Antarctic Urospora penicilliformis (Ulotrichales, Chlorophyta) to ultraviolet radiation is life stage dependent. Journal of Phycology 45:600-609.
  • Hanelt D, Roleda MY (2009) Acclimation to UV-B radiation may induce a reduction in photoinhibitory stress on some Caribbean marine macrophytes. Aquatic Botany 91:6-12.
  • Zacher K, Roleda MY, Wulff A, Hanelt D, Wiencke C (2009) Responses of Antarctic Iridaea cordata (Rhodophyta) tetraspores exposed to ultraviolet radiation. Phycological Research 57:186-193.
  • Roleda MY, Mohlin M, Pattanaik B, Wulff A (2008) Photosynthetic response of Nodularia spumigena to UV and photosynthetically active radiation depends on nutrient (N, P) availability. FEMS Microbiology Ecology 66:230-242.
  • Roleda MY, Dethleff D, Wiencke C (2008) Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis. Polar Biology 31: 765-769.
  • Roleda MY, Zacher K, Wulff A, Hanelt D, Wiencke C (2008) Susceptibility of spores of different ploidy levels from Antarctic Gigartina skottsbergii (Gigartina, Rhodophyta) to ultraviolet radiation. Phycologia 47: 361-370.
  • Bartsch I, Wiencke C, Bischof K, Buchholz CM, Buck BH, Eggert A, Feuerpfeil P, Hanelt D, Jacobson S, Karez R, Karsten U, Molis M, Roleda MY, Schubert H, Schumann R, Valentin K, Weinberger F, Wiese J (2008) The genus Laminaria sensu lato: recent insights and developments. European Journal of Phycology 43: 1-86.
  • Pattanaik B, Roleda MY, Schumann R, Karsten U (2008) Isolate-specific effects of ultraviolet radiation on photosynthesis, growth and mycosporine-like amino acids in the microbial mat-forming cyanobacterium Microcoleus chthonoplastes. Planta 227: 907-916.
  • Wulff A, Roleda MY, Zacher K, Wiencke C (2008) UV radiation effects on pigments, photosynthetic efficiency and DNA of a semi-natural Antarctic marine benthic diatom community. Aquatic Biology 3: 167-177.
  • Wulff A, Roleda MY, Zacher K, Wiencke C (2008) Exposure to sudden light burst after prolonged darkness- a case study on benthic diatoms in Antarctica. Diatom Research 32: 519-532.
  • Roleda MY, Zacher K, Wulff A, Hanelt D, Wiencke C (2007) Photosynthetic performance, DNA damage and repair in gametes of the endemic Antarctic brown alga Ascoseira mirabilis exposed to ultraviolet radiation. Austral Ecology 32: 917-926.
  • Roleda MY, Wiencke C, Hanelt D, Bischof K (2007). Sensitivity of the early life stages of macroalgae from the Northern Hemisphere to ultraviolet radiation. Photochemistry and Photobiology 83: 851-862.
  • Wiencke C, Lüder UH, Roleda MY (2007). Impact of ultraviolet radiation on physiology and development of zoospores of the brown alga Alaria esculenta from Spitzbergen. Physiologia Plantarum 130: 601-612.
  • Zacher K, Roleda MY, Hanelt D, Wiencke C (2007). UV effects on photosynthesis and DNA in propagules of three different Antarctic seaweeds (Adenocystis utricularis, Monostroma hariotii and Porphyra endiviifolium). Planta 225: 1505-1516.
  • Roleda MY, Wiencke C, Lüder UH (2006) Impact of ultraviolet radiation on cell structure, UV-absorbing compounds, photosynthesis, DNA damage and germination in zoospores of Arctic Saccorhiza dermatodea. Journal of Experimental Botany 57: 3847-3856.
  • Roleda MY, Clayton MN, Wiencke C (2006) Screening capacity of UV-absorbing compounds in spores of Arctic Laminariales. Journal of Experimental Marine Biology and Ecology 338:123-133.
  • Roleda MY, Hanelt D, Wiencke C (2006) Exposure to ultraviolet radiation delays photosynthetic recovery in Arctic kelp zoospores. Photosynthesis Research 88: 311-322.
  • Roleda MY, Hanelt D, Wiencke C (2006) Growth and DNA damage in young Laminaria sporophytes exposed to ultraviolet radiation: implication for depth zonation of kelps on Helgoland. Marine Biology 148: 1201-1211.
  • Roleda MY, Wiencke C, Hanelt D (2006) Thallus morphology and optical characteristics affect growth and DNA damage by UV radiation in juvenile Arctic Laminaria sporophytes. Planta 223: 407-417.
  • Wiencke C, Roleda MY, Gruber A, Clayton MN, Bischof K (2006) Susceptibility of zoospores to UV radiation determines upper depth distribution limit of Arctic kelps: evidence through field experiments. Journal of Ecology 94: 455-463.
  • Bischof K, Gomez I, Molis M, Hanelt D, Karsten U, Lüder U, Roleda MY, Zacher K, Wiencke C (2006) Ultraviolet radiation shapes seaweed communities. Reviews in Environmental Science and Bio/technology 5: 141-166.
  • Roleda MY, Wiencke C, Hanelt D, van de Poll WH, Gruber, A (2005) Sensitivity of Laminariales zoospores from Helgoland to ultraviolet and photosynthetically active radiation: implications on depth distribution and seasonal reproduction. Plant, Cell and Environment 28: 466-479.
  • Roleda MY, Hanelt D, Wiencke C (2005) Growth kinetics related to physiological parameters in young Saccorhiza dermatodea and Alaria esculenta sporophytes exposed to UV radiation. Polar Biology 28: 466-479.
  • Roleda MY, van de Poll WH, Hanelt D, Wiencke C (2004) PAR and UVBR effects on photosynthesis, viability, growth and DNA in different life stages of two coexisting Gigartinales: implications on recruitment and zonation pattern. Marine Ecology Progress Series 281: 37-50.
  • Roleda MY, Hanelt D, Kräbs G, Wiencke C (2004). Morphology, growth, photosynthesis and pigments in Laminaria ochroleuca (Laminariales, Phaeophyta) under UV radiation. Phycologia 43: 603-613.
  • Rollon RN, Samson MS, Roleda MY, Araño KG, Vergara MWB, Licuanan WY (2003). Estimating biomass from the cover of Gelidiella acerosa along the coasts of Eastern Philippines. Botanica Marina 46: 497-502.
  • Roleda MY, Ganzon-Fortes ET, Montaño NE (1997). Agar from vegetative and tetrasporic Gelidiella acerosa (Gelidiales, Rhodophyta). Botanica Marina 40: 501-506.
  • Roleda MY, Ganzon-Fortes ET, Montaño NE, de los Reyes FN (1997). Temporal variation in the biomass, quantity and quality of agar from Gelidiella acerosa (Forsskål) Feldmann et Hamel (Rhodophyta: Gelidiales) from Cape Bolinao, NW Philippines. Botanica Marina 40: 487-495.
  • Roleda MY, Montaño NE, Ganzon-Fortes ET, Villanueva RD (1997). Acetic acid pretreatment in agar extraction of Philippine Gelidiella acerosa (Forsskaal) Feldmann et Hamel (Rhodophyta, Gelidiales). Botanica Marina 40: 63-69.
Back to Faculty