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  • 1
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    Maintenance of Intraspecific Diversity in Response to Species Competition and Nutrient Fluctuations (2022)
    MDPI
    Details
    Publication Date: 2024-02-07
    Description: Intraspecific diversity is a substantial part of biodiversity, yet little is known about its maintenance. Understanding mechanisms of intraspecific diversity shifts provides realistic detail about how phytoplankton communities evolve to new environmental conditions, a process especially important in times of climate change. Here, we aimed to identify factors that maintain genotype diversity and link the observed diversity change to measured phytoplankton morpho-functional traits Vmax and cell size of the species and genotypes. In an experimental setup, the two phytoplankton species Emiliania huxleyi and Chaetoceros affinis, each consisting of nine genotypes, were cultivated separately and together under different fluctuation and nutrient regimes. Their genotype composition was assessed after 49 and 91 days, and Shannon’s diversity index was calculated on the genotype level. We found that a higher intraspecific diversity can be maintained in the presence of a competitor, provided it has a substantial proportion to total biovolume. Both fluctuation and nutrient regime showed species-specific effects and especially structured genotype sorting of C. affinis. While we could relate species sorting with the measured traits, genotype diversity shifts could only be partly explained. The observed context dependency of genotype maintenance suggests that the evolutionary potential could be better understood, if studied in more natural settings including fluctuations and competition.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Trait measurements of the phytoplankton species Chaetoceros affinis and Emiliania huxleyi (2022)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Description: Trait measurements for growth, nutrient uptake, and cell volume for nine genotypes each of the phytoplankton species Chaetoceros affinis and Emiliania huxleyi individually during 4 days of cultivation at seven nitrate levels. Nitrate levels for genotypes of C. affinis were 2.5, 5, 7.5, 12.5, 20, 30, and 45 μmol L−1 with 2 μmol L−1 phosphate and 2.5, 5, 7.5, 10, 15, 20, and 25 μmol L−1 with 1.5 μmol L−1 phosphate for genotypes of E. huxleyi.
    Keywords: Autoanalyzer (Thermo Scientific Flash); Bottle number; Cell density; cell size; Chaetoceros affinis; Chaetoceros affinis, length; Chaetoceros affinis, width; Competition; DATE/TIME; Emiliania huxleyi; Emiliania huxleyi, diameter; Experiment; Experiment day; genotype coexistence; Microscopy (Zeiss Axiovert 200); Microscopy (Zeiss Axiovert 200 and Axio Observer A1); Morphotype; Nitrate; nutrient fluctuations; Phosphate; Phytoplankton; Priority Programme 1704 DynaTrait: Flexibility Matters: Interplay between Trait Diversity and Ecological Dynamics Using Aquatic Communities as Model Systems; Silicate; Species; SPP1704; trait variability; Treatment; Vmax
    Type: Dataset
    Format: text/tab-separated-values, 19745 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Long term experiment with the phytoplankton species Chaetoceros affinis and Emiliania huxleyi: genotype abundance (2022)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Description: Genotype abundance present in the cultures of the long term experiment after batch cycles 7 and 13, identified using microsatellites.
    Keywords: Bottle number; cell size; Chaetoceros affinis; Competition; DATE/TIME; Emiliania huxleyi; Experiment; Genotype; genotype coexistence; Genotyping using microsatellites; Number of batch; nutrient fluctuations; Phytoplankton; Priority Programme 1704 DynaTrait: Flexibility Matters: Interplay between Trait Diversity and Ecological Dynamics Using Aquatic Communities as Model Systems; Sample ID; Species; SPP1704; trait variability; Treatment; Treatment: nutrients; Vmax
    Type: Dataset
    Format: text/tab-separated-values, 11267 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Trait measurements and long-term experiment on maintenance of intraspecific diversity using genotypes of phytoplankton species Chaetoceros affinis and Emiliania huxleyi (2022)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Description: Measurements of cell density, nutrient concentration and genotype composition in a long term experiment (91 days) with the marine phytoplankton species Chaetoceros affinis and Emiliania huxleyi, each consisting of nine genotypes. Cultivation of species was done separately in mono-cultures and together in mix-cultures at three different nutrient regimes (10N:1P, 20N:1P, and 30N:1P) with increasing nitrate concentration in a semi-continuous batch cycle system. Transfer of part of the cells into bottles with new nutrients every 7 days at fixed batch cycle length and after 7,4, and 10 days in a recurring fashion at variable batch cycle length. With the information about the genotype abundance we assessed how intraspecific diversity is maintained in response to species competition and nutrient fluctuations. Individual trait measurements for growth, nutrient uptake, and cell volume of the genotypes at seven nitrate levels in a 4-day experiment allowed us to connect traits to the genotype sorting of the long term experiment.
    Keywords: cell size; Chaetoceros affinis; Competition; Emiliania huxleyi; genotype coexistence; nutrient fluctuations; Phytoplankton; Priority Programme 1704 DynaTrait: Flexibility Matters: Interplay between Trait Diversity and Ecological Dynamics Using Aquatic Communities as Model Systems; SPP1704; trait variability; Vmax
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Experiments on coexisting phytoplankton species Chaetoceros affinis and Emiliania huxleyi in response to nutrients (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Description: Measurements of cell size, cell density, nutrient concentration and genotype composition in a long-term experiment (182 days) with the marine phytoplankton species Chaetoceros affinis and Emiliania huxleyi, each consisting of nine genotypes. The species were cultivated together at three different nutrient regimes (10 N, 20 N, 30 N) with increasing nitrate supply in a semi-continuous batch cycle system. The genotype composition of both species was assessed after 49, 91, and 182 days using microsatellites. In a short-term experiment cell size and density of nine Chaetoceros affinis genotypes separately were measured after 7 days growth at seven nitrate levels (2.5, 5, 7.5, 12.5, 20, 30, and 45 μmol L−1 N).
    Keywords: cell size; diatoms; evolution; Genotype Sorting; Laboratory experiment; nutrients; phenotypic plasticity; Phytoplankton; Priority Programme 1704 DynaTrait: Flexibility Matters: Interplay between Trait Diversity and Ecological Dynamics Using Aquatic Communities as Model Systems; Species Sorting; SPP1704; trait variability
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Long term experiment using a semi-continuous batch cycle system with the phytoplankton species Chaetoceros affinis and Emiliania huxleyi (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-22
    Description: Long term experiment using a semi-continuous batch cycle system with the phytoplankton species Chaetoceros affinis and Emiliania huxleyi each consisting of 9 genotypes (http://roscoff-culture-collection.org/; Emiliania huxleyi: GC22: RCC6383, C42: RCC6376, C41: RCC6375, C47: RCC4546, C96: RCC6381, C91: RCC6380, C35: RCC6374, C30: RCC6371, C48: RCC6377, Chaetoceros affinis: B63: RCC6347, B67: RCC6348, B68: RCC6349, B74: RCC6350). Cultivation of species separately in mono-cultures and together in mix-cultures at three different nutrient regimes (10N:1P, 20N:1P, and 30N:1P) with increasing nitrate concentration over 91 days. Nutrient concentrations were 8.60 ± 0.62, 19.08 ± 0.32, and 29.36 ± 0.47 µmol L−1 nitrate and 0.93 ± 0.09 phosphate. Silicate concentrations were aligned to reflect a 4:1 N:Si ratio. Transfer of part of the cells into bottles with new nutrients every 7 days at fixed batch cycle length and after 7,4, and 10 days in a recurring fashion at variable batch cycle length. Measurements of cell density and cell volume at the end of every batch cycle and cell density or fluorescence daily during the third batch cycle. Nitrate, phosphate, and silicate measurements in mix-cultures at variable batch cycle length at the end of the first (7 days), second (4 days), and third (10 days) batch cycle. Daily nutrient measurements in mix-cultures from day 4 to day 7 at batch cycle seven.
    Keywords: Autoanalyzer (Thermo Scientific Flash); Bottle number; cell size; Chaetoceros affinis; Chaetoceros affinis, cell biovolume; Competition; DATE/TIME; Emiliania huxleyi; Emiliania huxleyi, cell biovolume; Experiment; Experiment day; Fluorescence; Fluorometer, Turner Designs, 10-AU; genotype coexistence; Microscopy (Zeiss Axiovert 200 and Axio Observer A1); Nitrate; Number of batch; nutrient fluctuations; Phosphate; Phytoplankton; Priority Programme 1704 DynaTrait: Flexibility Matters: Interplay between Trait Diversity and Ecological Dynamics Using Aquatic Communities as Model Systems; Silicate; SPP1704; trait variability; Treatment; Treatment: nutrients; Vmax
    Type: Dataset
    Format: text/tab-separated-values, 18078 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Comparison of biological and ecological long-term marine trends related to northern hemisphere climate in different marine ecosystems (2019)
    In:  EPIC3Nature Conservation, 34, pp. 311-341
    Details
    Publication Date: 2019-05-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
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