Description: Phytoplankton populations can display high levels of genetic diversity that, when reflected by phenotypic variability, may stabilize a species response to environmental changes. We studied the effects of increased temperature and CO2 availability as predicted consequences of global change, on 16 genetically different isolates of the diatom Skeletonema marinoi from the Adriatic Sea and the Skagerrak (North Sea), and on eight strains of the PST (paralytic shellfish toxin)-producing dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Maximum growth rates were estimated in batch cultures of acclimated isolates grown for five to 10 generations in a factorial design at 20 and 24 °C, and present day and next century applied atmospheric pCO2, respectively. In both species, individual strains were affected in different ways by increased temperature and pCO2. The strongest response variability, buffering overall effects, was detected among Adriatic S. marinoi strains. Skagerrak strains showed a more uniform response, particularly to increased temperature, with an overall positive effect on growth. Increased temperature also caused a general growth stimulation in A. ostenfeldii, despite notable variability in strain-specific response patterns. Our data revealed a significant relationship between strain-specific growth rates and the impact of pCO2 on growth-slow growing cultures were generally positively affected, while fast growing cultures showed no or negative responses to increased pCO2. Toxin composition of A. ostenfeldii was consistently altered by elevated temperature and increased CO2 supply in the tested strains, resulting in overall promotion of saxitoxin production by both treatments. Our findings suggest that phenotypic variability within populations plays an important role in the adaptation of phytoplankton to changing environments, potentially attenuating short-term effects and forming the basis for selection. In particular, A. ostenfeldii blooms may expand and increase in toxicity under increased water temperature and atmospheric pCO2 conditions, with potentially severe consequences for the coastal ecosystem.
Global identifier:
Doi(
"10.1594/PANGAEA.823376",
)
Measurements {
domain: Unspecified,
station: None,
measured_variables: [
"Event label",
"Species",
"Identification",
"LATITUDE",
"LONGITUDE",
"Sample code/label",
"Treatment",
"Growth rate",
"Cellular paralytic shellfish toxin, total",
"Cellular gonyautoxins 2,3",
"Cellular saxitoxin",
"Cellular saxitoxin/cellular total paralytic shellfish toxin ratio",
"Temperature, water",
"Temperature, water, standard error",
"Salinity",
"Alkalinity, total",
"Alkalinity, total, standard error",
"pH, total scale",
"pH, standard error",
"Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)",
"Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error",
"Carbonate system computation flag",
"Carbon dioxide",
"Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)",
"Fugacity of carbon dioxide (water) at sea surface temperature (wet air)",
"Bicarbonate ion",
"Carbonate ion",
"Carbon, inorganic, dissolved",
"Aragonite saturation state",
"Calcite saturation state",
],
methods: [
"High Performance Liquid Chromatography (HPLC)",
"High Performance Liquid Chromatography (HPLC)",
"High Performance Liquid Chromatography (HPLC)",
"High Performance Liquid Chromatography (HPLC)",
"Potentiometric",
"Potentiometric",
"Calculated using CO2SYS",
"Calculated using CO2SYS",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
"Calculated using seacarb after Nisumaa et al. (2010)",
],
}
Dataset
Comment: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2013-11-28.
Origins: /Wissenschaft/PANGAEA
Tags: Meerestemperatur ? Meerwasser ? Phytoplankton ? Wassertemperatur ? Geografische Koordinaten ? Kohlendioxid ? Temperatur ? Toxin ? Salzgehalt ? Daten ? Laborversuch ? Genetische Vielfalt ? Nordatlantik ? Mittelmeer ? Nordsee ? Ostsee ? Alexandrium ostenfeldii ? Bottles or small containers/Aquaria (<20 L) ? Chromista ? Growth/Morphology ? Immunology/Self-protection ? Laboratory strains ? Ochrophyta ? Pelagos ? Single species ? Skeletonema marinoi ?
Bounding boxes: 11.05833° .. 20.51° x 43.925000000000004° .. 60.1°
License: cc-by/3.0
Language: Englisch/English
Modified: 2022-12-15
Time ranges: 2009-03-04 - 2010-04-15
Accessed 2 times.