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  • 577.7  (1)
  • Alkalinity, total; Aragonite saturation state; Baltic Sea; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; DATE/TIME; Day of experiment; Dolichospermum spp., biomass; Entire community; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Mesocosm label; Mesocosm or benthocosm; Nodularia spp., biomass; Nostoc sp., biomass as carbon; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phase; Phosphate; Phosphate, organic, dissolved; Phytoplankton, biomass; Ratio; Salinity; Sample code/label; Silicate; Temperate; Temperature; Temperature, water; Treatment: temperature; Type; δ15N  (1)
  • 2020-2022  (1)
  • 2015-2019  (1)
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  • 2020-2022  (1)
  • 2015-2019  (1)
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  • 1
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    Tackling the jelly web: Trophic ecology of gelatinous zooplankton in oceanic food webs of the eastern tropical Atlantic assessed by stable isotope analysis (2021)
    Details
    Publication Date: 2021-11-03
    Description: Gelatinous zooplankton can be present in high biomass and taxonomic diversity in planktonic oceanic food webs, yet the trophic structuring and importance of this “jelly web” remain incompletely understood. To address this knowledge gap, we provide a holistic trophic characterization of a jelly web in the eastern tropical Atlantic, based on δ13C and δ15N stable isotope analysis of a unique gelatinous zooplankton sample set. The jelly web covered most of the isotopic niche space of the entire planktonic oceanic food web, spanning 〉 3 trophic levels, ranging from herbivores (e.g., pyrosomes) to higher predators (e.g., ctenophores), highlighting the diverse functional roles and broad possible food web relevance of gelatinous zooplankton. Among gelatinous zooplankton taxa, comparisons of isotopic niches pointed to the presence of differentiation and resource partitioning, but also highlighted the potential for competition, e.g., between hydromedusae and siphonophores. Significant differences in spatial (seamount vs. open ocean) and depth-resolved patterns (0–400 m vs. 400–1000 m) pointed to additional complexity, and raise questions about the extent of connectivity between locations and differential patterns in vertical coupling between gelatinous zooplankton groups. Added complexity also resulted from inconsistent patterns in trophic ontogenetic shifts among groups. We conclude that the broad trophic niche covered by the jelly web, patterns in niche differentiation within this web, and substantial complexity at the spatial, depth, and taxon level call for a more careful consideration of gelatinous zooplankton in oceanic food web models. In light of climate change and fishing pressure, the data presented here also provide a valuable baseline against which to measure future trophic observations of gelatinous zooplankton communities in the eastern tropical Atlantic.
    Keywords: 577.7 ; eastern tropical Atlantic ; gelatinous zooplankton ; isotopic pattern ; food web characterization
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
  • 2
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    Seawater carbonate chemistry and phytoplankton biomass during the BIOACID II indoor mesocosm study in the Kiel Fjord (Baltic Sea) (2018)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Nitrogen fixation is a key source of nitrogen in the Baltic Sea which counteracts nitrogen loss processes in the deep anoxic basins. Laboratory and field studies have indicated that single-strain nitrogen-fixing (diazotrophic) cyanobacteria from the Baltic Sea are sensitive to ocean acidification and warming, 2 drivers of marked future change in the marine environment. Here, we enclosed a natural plankton community in 12 indoor mesocosms (volume 1400 l) and manipulated partial pressure of carbon dioxide ( pCO2) in seawater to yield 6 CO2 treatments with 2 different temperature treatments (16.6°C and 22.4°C, pCO2 range = 360-2030 µatm). We followed the filamentous, heterocystous diazotrophic cyanobacteria community (Nostocales, primarily Nodularia spumigena) over 4 wk. Our results indicate that heterocystous diazotrophic cyanobacteria may become less competitive in natural plankton communities under ocean acidification. Elevated CO2 had a negative impact on Nodularia sp. biomass, which was exacerbated by warming. Our results imply that Nodularia sp. may contribute less to new nitrogen inputs in the Baltic Sea in the future.
    Keywords: Alkalinity, total; Aragonite saturation state; Baltic Sea; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; DATE/TIME; Day of experiment; Dolichospermum spp., biomass; Entire community; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Mesocosm label; Mesocosm or benthocosm; Nodularia spp., biomass; Nostoc sp., biomass as carbon; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phase; Phosphate; Phosphate, organic, dissolved; Phytoplankton, biomass; Ratio; Salinity; Sample code/label; Silicate; Temperate; Temperature; Temperature, water; Treatment: temperature; Type; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 6046 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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