Articles | Volume 12, issue 6
Ocean Sci., 12, 1237–1247, 2016

Special issue: COSYNA: integrating observations and modeling to understand...

Ocean Sci., 12, 1237–1247, 2016

Research article 22 Nov 2016

Research article | 22 Nov 2016

High-resolution monitoring of marine protists based on an observation strategy integrating automated on-board filtration and molecular analyses

Katja Metfies1, Friedhelm Schroeder2, Johanna Hessel1, Jochen Wollschläger2, Sebastian Micheller1, Christian Wolf1, Estelle Kilias1, Pim Sprong1, Stefan Neuhaus3, Stephan Frickenhaus3, and Wilhelm Petersen2 Katja Metfies et al.
  • 1Helmholtz Young Investigators Group PLANKTOSENS, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
  • 2In-situ Measuring Systems, Helmholtz Zentrum Geesthacht Centre for Materials and Coastal Research, 21502 Geesthacht, Germany
  • 3Scientific Computing, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570 Bremerhaven, Germany

Abstract. Information on recent biomass distribution and biogeography of photosynthetic marine protists with adequate temporal and spatial resolution is urgently needed to better understand the consequences of environmental change for marine ecosystems. Here we introduce and review a molecular-based observation strategy for high-resolution assessment of these protists in space and time. It is the result of extensive technology developments, adaptations and evaluations which are documented in a number of different publications, and the results of the recently completed field testing which are introduced in this paper. The observation strategy is organized at four different levels. At level 1, samples are collected at high spatiotemporal resolution using the remotely controlled automated filtration system AUTOFIM. Resulting samples can either be preserved for later laboratory analyses, or directly subjected to molecular surveillance of key species aboard the ship via an automated biosensor system or quantitative polymerase chain reaction (level 2). Preserved samples are analyzed at the next observational levels in the laboratory (levels 3 and 4). At level 3 this involves molecular fingerprinting methods for a quick and reliable overview of differences in protist community composition. Finally, selected samples can be used to generate a detailed analysis of taxonomic protist composition via the latest next generation sequencing technology (NGS) at level 4. An overall integrated dataset of the results based on the different analyses provides comprehensive information on the diversity and biogeography of protists, including all related size classes. At the same time the cost of the observation is optimized with respect to analysis effort and time.

Short summary
Here we introduce a new molecular-based observation strategy for high-resolution assessment of marine microbes (e.g., microalgae) in space and time. The observation strategy combines automated sampling on board ships or observation platforms with a variety of different molecular genetic methods for refined observation of marine microbes at adaquate scales, in order to better understand the impact of climate change on this group of organisms, which are at the base of marine food webs.