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Botanica Marina

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Volume 60, Issue 4


Effects of environmental parameters on chytrid infection prevalence of four marine diatoms: a laboratory case study

Bettina Scholz
  • Corresponding author
  • BioPol ehf., Einbúastig 2, 545 Skagaströnd, Iceland
  • Faculty of Natural Resource Sciences, University of Akureyri, Borgir v. Nordurslod, IS 600 Akureyri, Iceland
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Wim Vyverman
  • Department of Biology, Section of Protistology and Aquatic Ecology, University of Ghent, Krijgslaan 281 S8, 9000 Ghent, Belgium
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Frithjof C. Küpper / Halldór G. Ólafsson / Ulf Karsten
  • Institute of Biological Sciences, Applied Ecology and Phycology, University of Rostock, Albert-Einstein-Strasse 3, 18059 Rostock, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-06-20 | DOI: https://doi.org/10.1515/bot-2016-0105


The influence of environmental factors on the infection susceptibility of four different marine diatom host species to chytrid infection was tested under laboratory conditions, using host and parasite isolates obtained from diverse coastal areas in north-west Iceland in 2015. Specifically, a total of 120 monoclonal marine diatom host cultures of Navicula, Nitzschia, Rhizosolenia and Chaetoceros were exposed to their chytrid parasites Chytridium type I and Rhizophydium type I and II in Hellendahl glass staining jars which were subdivided in two compartments by nylon filters (mesh size 5 μm). Infection densities were assessed at different temperatures (5, 15, 20°C), salinities (0, 5, 10, 20, 40), photon fluence rates (PFR; 10, 50, 100, 200 μmol photons m−2 s−1) and photoperiods (24 h dark, 8:16 h, 16:8 h light:dark and 24 h light) after 168 h exposure, using the one-factor-at-a-time method. In addition, growth rates and proline concentrations of the non-infected monoclonal host cultures were determined. In most cases, decreasing growth rates during the acclimatisation process to abiotic stressors were directly related to increases of proline in the host cells. Significant positive associations of infection densities to cell based proline concentrations were predominantly observed in the high-PFR assays and 24-h daylight treatments. At least for half of the tested host-parasite pairs, positive correlations of proline and parasite prevalence were found. In addition, chytrid abundance was also positively correlated with host densities of Navicula sp., Rhizosolenia sp. and Chaetoceros sp. Only in Nitzschia sp., was parasite density negatively associated with proline and showed no significant relationship to host densities, suggesting that other physiological/biochemical factors related to stress might have an impact on the susceptibility of this peculiar host diatom species.

Keywords: chytrids; marine diatoms; parasite-host dual cultures; proline concentrations; stress physiology


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About the article

Bettina Scholz

Bettina Scholz has been a postdoctoral researcher and project manager at BioPol ehf since 2012 and currently holds the position of an Adjunct Research Professor at the University of Akureyri, Iceland. Her research has focused on algae under varying aspects since 1996. In her thesis, conducted at the Carl von Ossietzky University Oldenburg, Germany, she highlighted the physiological acclimatisation potential of microphytobenthic Wadden Sea diatoms to environmental conditions and their influence on community compositions. Her current research interests comprise the physiology, biochemistry and biodiversity of planktonic and microphytobenthic microalgae (in sensu stricto: Bacillariophyceae or diatoms) in sub-Arctic and Arctic marine environments, especially in the context of defense and stress.

Wim Vyverman

Wim Vyverman has headed the Laboratory of Protistology and Aquatic Ecology, Ghent University since 1996 and is director of the BCCM/DCG culture collection (http://bccm.belspo.be/about-us/bccm-dcg). His research focuses on the biology, biodiversity, ecology and evolution of eukaryote microbes, in particular diatoms. He has worked extensively on tropical and high-latitude lakes as well as in temperate coastal ecosystems. In recent years, he has been using omic approaches to understand the nature of interactions between micro-organisms and their ecological and evolutionary importance in natural environments and algae production systems.

Frithjof C. Küpper

Frithjof C. Küpper has held the Chair in Marine Biodiversity at the University of Aberdeen (Oceanlab) since 2011. Over the past 26 years, he has studied the biodiversity and biochemistry of marine plants/algae – especially abiotic and biotic stress including algal pathologies. He conducted graduate studies at Roscoff and Konstanz for a joint French-German PhD. His research resulted in the finding of iodide serving as an inorganic antioxidant in kelp, the first described from a living system, impacting atmospheric and marine chemistry. As a certified scientific diver, Frithjof has worked extensively in the South Atlantic (Ascension and Falkland Islands), as well as in the Antarctic Peninsula and the Canadian Arctic for algal diversity-related projects.

Halldór G. Ólafsson

Halldór G. Ólafsson has been the Managing Director at BioPol ehf since 2007. He has a degree in Fisheries and worked as a manager in both the Icelandic and Norwegian fish industry. He has participated actively in various marine research projects conducted at BioPol ehf in recent years.

Ulf Karsten

Ulf Karsten has held the Chair in Applied Ecology at the Institute of Biological Sciences, University of Rostock, Germany since 2000. His research expertise comprises the ecology, physiology, biochemistry and molecular biology of marine and terrestrial algae and cyanobacteria.

Received: 2016-09-23

Accepted: 2017-05-16

Published Online: 2017-06-20

Published in Print: 2017-07-26

Citation Information: Botanica Marina, Volume 60, Issue 4, Pages 419–431, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/bot-2016-0105.

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