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Plenary Speakers

Baldi Memorial Lecture

  • NameMichele Burford
  • AffiliationAustralian Rivers Institute, Griffith University, Australia
  • Title of presentationLimnologists have a role in ensuring a better future for the planet and us.
  • Website
    • Michele Burford and her team take a whole-of-catchment approach to linking human impacts, such as nutrient loads, on ecosystem health and functioning. She is particularly interested in nutrient biogeochemistry and algal ecology and physiology, with a focus on harmful species. She has over 150 scientific publications, and works collaboratively with industry, government and researchers in a wide range of disciplines.

      Limnologists have a role in ensuring a better future for us, and more importantly, the planet

      Michele Burford1, Anusuya Willis1,2, Man Xiao1, Hannah Franklin1, Alexandra Garzon-Garcia3, Joanne Burton3, Anthony Carroll4, David Hamilton1

      1 Australian Rivers Institute, Griffith University, Nathan 4111, Australia
      2 National Research Collections Australia, CSIRO National Collections and Marine Infrastructure, Hobart, 7000, Australia
      3 Queensland, Department of Environment and Science, Dutton Park, 4102, Australia
      4 Griffith Research Institute for Drug Discovery, Griffith University, Southport, 4222, Australia

      We are becoming acutely aware of global environmental challenges. The uncertainties of climate change, coupled with eutrophication, growing human populations and exploitation of resources are all issues making the need for research targeted at understanding and solving environmental problems all the more important. Limnologists have an important role to play in helping governments and industries make scientifically robust decisions to ensure the sustainability of freshwater systems. The future relevance of limnology relies on multidisciplinary partnerships, active engagement with industry, government and the community. At its heart, my research my team is focused on understanding of the problems faced by government and industry, then applying approaches and techniques to help tackle these problems. For example, our research showed that toxic cyanobacterial species counts were not well correlated with toxin concentrations, due to a large variability in strain dominance within species. As a result, the water authority has shifted their sampling strategy, saving significant funds and resulting in a faster response time. We have also worked collaboratively with government and industry on nutrient offsetting which is a mechanism where point source polluters, e.g. sewage treatment plants, pay for catchment restoration, and hence reduce nutrient loads from this source, and in return, are able to increase their nutrient discharge by an equivalent amount. A key challenge is that it is difficult to directly compare catchment nutrient runoff with point source discharges. Our research is tackling this by developing a novel algal bioassay, and linked this to the nutrient parameters which best explain the bioassay responses to nutrient sources. We have also found that organic compounds have confounding effects, highlighting the complexity of understanding ecosystem responses to perturbations. In summary, I believe that working in a collaborative and multidisciplinary way has reaped both scientific and environmental benefits to help tackle current and future global challenges.

      Key words: nutrients, cyanobacteria, dissolved organic matter, nutrient offsetting

Kilham Memorial Lecture

  • NameCayelan Carey
  • AffiliationAssistant Professor of Virginia Tech
  • Title of presentation
  • E-mail
  • Website

K-water Plenary Lectures

  • NameIan Donohue
  • AffiliationSchool of Natural Sciences, Department of Zoology, Trinity College Dublin, Ireland
  • Title of presentationGlobal change and the stability of ecosystems
  • Website
    • I am a community ecologist and like to use experimental approaches to test theory and explore how we can best predict and enhance the stability of ecosystems. The overarching aim of my research is to further our understanding of how global change alters ecological functioning and stability. An important goal of my work is to bridge the gaps between theoretical, empirical and applied ecology.

  • NameRodolphe Elie Gozlan
  • AffiliationISEM (Institute of Evolution Sciences of Montpellier), University of Montpellier, CNRS,
    IRD, EPHE, Montpellier
  • Title of presentationFreshwater biodiversity decline: consequences for our societies?
  • Website
    • I am a Research Director at the French national research institute for sustainable development (IRD). My early research focused on identifying the ecological constraints on the endangered fish species, which had abundant resources yet were rare and declining. I established a holistic approach, which revealed the importance of larval niches and habitat quality for endemic species persistence as well as the constraints on adult migrations. I have now expanded my study-systems to include complex í«community modulesí» of interacting species, mainly involving invasive fish and emerging pathogens. These closely-coupled systems are well suited for studying fundamental questions in population, community, functional and evolutionary theory and could be applied to the conservation of typically endangered species.

  • NameSoon-Jin Hwang
  • AffiliationDepartment of Environmental Health Science, Konkuk University
  • Title of presentationGlobal Evaluation of Freshwater Ecosystem Health with Emphasis on
    Korean Stream Health Program
  • Website
    • Dr. Hwang is a professor in Department of Environmental Health Science, Konkuk University, Seoul, Korea. He is an aquatic ecologist, and his research areas are plankton and periphyton dynamics, pelagic-benthic coupling, and ecological restoration. He is particularly interested in how natural and human-related stressors affect the structure and function of aquatic ecosystem. Recently, he has been working on the dynamics of harmful material such as geosmin, 2-MIB, and toxins produced by cyanobacteria, using molecular genetic tools (eDNA and eRNA). He is also working on diatom eDNA to find a way of improving conventional bioassessment method. He contributed to establish National Aquatic Ecological Monitoring Program in Korea, and has been a PI of the national survey of aquatic ecosystem health since 2008.

  • NameBomchul Kim
  • AffiliationDepartment of Environmental Science, Kangwon National University, Korea
  • Title of presentationLimnological conditions of Korea
  • Website
    • Professor in the Department of Environmental Science, Kangwon National University
      former President of the Korean Society of Limnology
      research topics;
      eutrophication of reservoirs
      primary productivity of phytoplankton
      phosphorus cycle in freshwater

      Limnological conditions of Korea

      There are few natural lakes in Korea, because geological formation is old and there was no glacial activity. Due to the monsoon climate and high water demand, 17,500 reservoirs have been built in South Korea. Most of rivers have been changed from lotic habitats into a series of reservoirs or highly regulated channels. In addition, more than 34,000 weirs were built and most of rivers are confined by river banks. Hydrologic and morphologic modifications might be the major adverse factor of stream ecosystem health.

      Summer monsoon is the controlling factor of freshwater habitats. The rainfall pattern shows an extreme concentration in a few episodic rain events exceeding 100 mm/day. Stream beds are disturbed during storms and most benthic animals are washed downstream, a phenomenon considered as a í«reset of ecosystemí».

      Eutrophication imposes additional stress both in lakes and streams. About one half of Korean reservoirs are eutrophic, and cyanobacterial blooms are common. Hypoxia in the hypolimnion and toxic cyanobacterial blooms are major factors that determine the biological diversity in reservoir ecosystems. Phosphorus is the primary limiting nutrient in Korea, and the effect of nitrogen is limited because of high natural background concentration. Major sources of phosphorus are sewage, compost, and fertilizer.

      The monsoon climate exerts different effects on lakes and streams. In large dams turbid storm runoffs in summer bring in most of annual phosphorus loading, causing 'monsoon blooms' of phytoplankton after summer monsoon. Whereas, algal blooms occur in drought periods in riverine reservoirs or rivers. Agricultural runoff is the main cause of eutrophication in large dams, comparable to the effects of municipal sewage in impoundments in the lower reaches of river systems.

      A unique limnological feature of East Asian countries subject to summer monsoons are very dynamic flow rates and nutrient loadings, far from a steady state.

  • NameShinichi Nakano
  • AffiliationCenter for Ecological Research, Kyoto University
  • Title of presentationA Unique Microbial Loop in the Hypolimnion of Lake Biwa
  • Website
    • Shin-ichi is a Professor of Center for Ecological Research (CER), Kyoto University, and an ecologist for microbial loop in freshwater environments. In 1994, he started his research career as a researcher at the Lake Biwa Research Institute, the Prefectural institute for conservation of Lake Biwa, the largest lake in Japan. He conducted several research projects on bloom forming mechanisms of Microcystis in the lake. In 1996, he moved to Ehime University and studied on protistan (protozoan) ecology in eutrophic lake and coastal marine systems. In 2008, he came back to Lake Biwa as a professor of CER and has so far been conducting researches on food web dynamics, with special reference to bacterial, algal and protozoan ecology, in lakes, especially in Lake Biwa. At the present he is interested in microbial loop of hypolimnion in lakes.

      A Unique Microbial Loop in the Hypolimnion of Lake Biwa

      We have been conducting studies on the microbial processes in the oxygenated hypolimnion of Lake Biwa, the largest lake in Japan. In the lakeí»s epilimnion, phytoplankton biomass is produced through primary production, followed by sinking into the hypolimnion. In the hypolimnion, a part of the phytoplankton biomass is converted into and produced as humic-like DOM through decomposition by planktonic bacteria. Fluorescence in situ hybridization (FISH) showed that bacterial clade, CL500-11 (phylum Chloroflexi), predominates in the hypolimnion. We made further analyses on prokaryotic community composition by high throughput 16S rRNA gene amplicon sequencing which showed the dominance by members of Planctomycetes exclusively occurred in the hypolimnion. In addition, FISH on eukaryotes showed that bacterivorous kinetoplastid flagellates are the dominant eukaryotes in the hypolimnion. So, the results indicate the presence of unique microbial food webs in the oxygenated hypolimnion of Lake Biwa: humic-like DOM is produced by the hypolimnion bacterial assemblages, and those bacteria are grazed by the dominant kinetoplastids and other hypolimnion dwelling bacterivorous protists. Our further studies on microbial loops in the oxygenated hypolimnion have demonstrated the dominance of CL500-11 bacterium in other Japanese and European lakes and kinetoplastid flagellates in other Japanese lakes. So, we hypothesize the ubiquitous presence of unique microbial loop consisting of CL500-11 bacterium and kinetoplastid flagellates in the oxygenated hypolimnion of deep lakes.

      Keywords: Dissolved Organic Matter, CL500-11 bacterium, Kinetoplastid flagellates, Microbial loop, Oxygenated hypolimnion

    D-60 22 AUGUST, 2021

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35th Congress of the International Society of Limnology (SIL2021)
426, Gonghang-daero, Gangseo-gu, Seoul, Korea (07654)
Korean Society of Limnology / Registration No. : 204-82-04773 / Representative : Sin Gyeong Hun
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