Ciliate grazing on the bloom-forming microalga Gonyostomum semen
type: Dataset
description: Cell count data set from infection experiment containing 8 columns, which are described below. Day: Day of the experiment. Date: Date of the experiment. Code: Unique identifier for each combination of G. semen and ciliate strains. G.semen_strain: Identifier for the G. semen strain used in this treatment. Ciliate_strain: Identifier for the ciliate strain used in this treatment. G. semen mono-cultures (without ciliates) are named "control". Treatment: Distinguishes control and grazing (with ciliates) treaments. Count: Specifies which taxon was counted (G. semen or ciliate). cells/ml: Cell concentration counted under an inverted microscope in cells/mL. The freshwater raphidophyte Gonyostomum semen forms extensive summer blooms in northern European humic lakes. The development of these blooms might be facilitated by a lack of natural top-down control, as few zooplankton species are able to prey on these large algal cells (up to 100µm) that expel trichocysts upon physical stress. In this study, we describe a small ciliate species (<17µm) that preys on G. semen by damaging the cell membrane until cytoplasm and organelles spill out. Sequencing of clonal cultures of the ciliate tentatively identified it as the prostomatid species Urotricha pseudofurcata. Grazing experiments illustrated that feeding by U. cf. pseudofurcata can significantly reduce cell concentrations of the microalga. However, differences in cell size and growth rate between two investigated ciliate strains resulted in noticeably different grazing pressure. Environmental sequencing data from five different lakes supported potential interactions between the two species. Urotricha cf. pseudofurcata might, thus, play an important role in aquatic ecosystems that are regularly dominated by G. semen, reducing the abundance of this bloom-forming microalga and enabling transfer of organic carbon to higher trophic levels. The dataset was originally published in DiVA and moved to SND in 2024.
conditions of access: http://publications.europa.eu/resource/authority/access-right/PUBLIC
conditions of access: info:eu-repo/semantics/openAccess
contributor: Eva Lindström
  type: Person
  family name: Lindström
  given name: Eva
creative work status: completed
  type: DefinedTerm
  in defined term set: http://publications.europa.eu/resource/authority/dataset-status
  term code: COMPLETED
creator: Ingrid Sassenhagen
date modified: 2024-06-20
date published: 2023-09-07
funding: Grant
  funder: Olle Engkvists stiftelse
language: English
is part of: https://doi.org/10.57804/tq7e-n687
keywords: Environmental Sciences
  type: DefinedTerm
  term code: 10502
keywords: Oceanography, Hydrology and Water Resources
  type: DefinedTerm
  term code: 10509
keywords: Microbiology
  type: DefinedTerm
  term code: 10606
keywords: Ecology
  type: DefinedTerm
  description: Including: Biodiversity Conservation
  term code: 10611
keywords: grazing experiment
keywords: Urotricha pseudofurcata
keywords: algal bloom
keywords: Biology with specialization in Limnology
keywords: Predator-prey interaction
publisher: Uppsala University
distribution: data/DATASET01.csv
  type: DataDownload
  additional type: data
  conditions of access: http://publications.europa.eu/resource/authority/access-right/PUBLIC
  conditions of access: info:eu-repo/semantics/openAccess
  content size: 11410
  encoding format: text/csv
version: 1

PropertyValue
property ID: DOI
value: 10.57804/bzkb-3987

PropertyValue
property ID: URN
value: urn:nbn:se:uu:diva-511093

Ingrid Sassenhagen
type: Person
affiliation: Uppsala University
family name: Sassenhagen
given name: Ingrid

Uppsala University
type: Organization
department: Department of Ecology and Genetics, Limnology

English
type: Language
alternate name: eng