GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (4)
  • 2015-2019  (4)
Document type
Source
Publisher
Years
Year
  • 1
    facet.materialart.
    Unknown
    Ocean acidification and global warming: Can we expect effects on microzooplankton communities? (2015)
    In:  EPIC3BIOACID Phase II Final Meeting, GEOMAR Kiel, 2015-10-06-2015-10-07
    Details
    Publication Date: 2016-12-01
    Description: The focus of this project was on the pivotal role of microzooplankton (MZP) as trophic intermediary between the microbial loop and higher trophic levels. At the base of the food web, MZP has a strong impact on phytoplankton standing stocks due to its high growth and grazing rates, leading to dietary competition with larger mesozooplankton. Simultaneously, higher trophic levels use MZP as food source and benefit from its ability to buffer nutritional imbalances especially at times when food quality of phytoplankton is low. Therefore, MZP abundance, biomass and taxonomic composition were investigated during three mesocosm experiments within the BIOACID II framework, using natural plankton communities. The KOSMOS 2013 Gullmar Fjord experiment in the North Sea was a long-term outdoor mesocosm study with an elevated CO2 level as single stressor. Contrastingly, the BIOACID Autumn 2012 and Summer 2013 Baltic Sea indoor mesocosm experiments investigated the combined effects of both high CO2 and warming. In conclusion, warming can be expected to directly affect MZP communities and enhance their growth and grazing pressure. Additionally, more complex responses of MZP to an increase in CO2 can be expected from the results. The present data points at predominately indirect effects on the MZP community via e.g. changes in phytoplankton community composition and/or standing stocks.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Life in the future ocean: effects of end-of-century warming and acidification conditions on microzooplankton (2015)
    In:  EPIC3AWI Science Meeting 2015, Bremerhaven
    Details
    Publication Date: 2016-12-01
    Description: Among the most important stressors for aquatic ecosystems in the future are global warming and ocean acidification. To investigate their direct and indirect effects on a near-natural plankton community, a large-scale approach is needed. Therefore, four mesocosm experiments were conducted within the BIOACID II framework, using plankton communities from the Baltic Sea, North Sea and Atlantic Ocean. The focus of this project was on the pivotal role of microzooplankton (MZP) as trophic intermediary between the microbial loop and higher trophic levels. At the base of the food web, MZP has a strong impact on phytoplankton standing stocks due to high growth and grazing rates, leading to dietary competition with mesozooplankton. Thus, data on MZP abundance, biomass and taxonomic composition was analysed with emphasis on phytoplankton-MZP-mesozooplankton interactions. In conclusion, warming can be expected to directly affect MZP communities and enhance their growth and grazing pressure. In contrast, the results point at more complex responses of MZP to an increase in pCO2. While direct effects on the MZP community could not be observed, the present data points at predominately indirect effects via e.g. changes in phytoplankton community composition and/or standing stocks. Such indirect alterations might, however, be compensated on an ecosystem level.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Some like it hot: the protozooplankton – copepod link in a warming ocean (2015)
    INTER-RESEARCH
    In:  EPIC3Marine Ecology-Progress Series, INTER-RESEARCH, 519, pp. 103-113, ISSN: 0171-8630
    Details
    Publication Date: 2015-02-25
    Description: The combined effects of warming and overwintering copepod densities on the spring succession of Baltic Sea plankton were investigated using indoor mesocosms. Three zooplankton (1.5, 4 and 10 copepods L-1) and two temperature levels called ∆0°C and ∆6°C (0°C and 6°C above the present day temperature scenario for Kiel Bight) were chosen. Both, the timing and the duration of the protozooplankton (PZP) bloom were significantly affected by temperature, but not by copepod density. In contrast, the bloom intensity of PZP was highly affected by the factors temperature and copepod density and its interaction. This suggests that at elevated temperature conditions PZP grows faster but, at the same time, are subject to higher top-down control by copepods. At low temperatures and low copepod densities, PZP in turn fully escaped from copepod predation. Further changes in the overwintering copepod densities resulted in a strong ciliate suppression of which small-sized ciliates (〈30 µm) were especially vulnerable to copepod predation while other PZP size classes remained unaffected. In conclusion, the results presented point at a pivotal regulating role of overwintering copepods under future warming condition. Further, warming was shown to cause a distinct match between phytoplankton and PZP thus strengthening trophic pathways through PZP. Our findings are discussed in the context of the ‘trophic link-sink’ debate by considering potential alterations in the flux of matter and energy up the food web.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 4
    facet.materialart.
    Unknown
    Effects of high CO2 and warming on a Baltic Sea microzooplankton community (2016)
    Oxford University Press
    In:  EPIC3ICES Journal of Marine Science, Oxford University Press, 73, pp. 772-782, ISSN: 1054-3139
    Details
    Publication Date: 2016-11-30
    Description: Global warming and ocean acidification are among the most important stressors for aquatic ecosystems in the future. To investigate their direct and indirect effects on a near-natural plankton community, a multiple-stressor approach is needed. Hence, we set up mesocosms in a full-factorial design to study the effects of both warming and high CO2 on a Baltic Sea autumn plankton community, concentrating on the impacts on microzooplankton (MZP). MZP abundance, biomass, and species composition were analysed over the course of the experiment. We observed that warming led to a reduced time-lag between the phytoplankton bloom and an MZP biomass maximum. MZP showed a significantly higher growth rate and an earlier biomass peak in the warm treatments while the biomass maximum was not affected. Increased pCO2 did not result in any significant effects on MZP biomass, growth rate, or species composition irrespective of the temperature, nor did we observe any significant interactions between CO2 and temperature. We attribute this to the high tolerance of this estuarine plankton community to fluctuations in pCO2, often resulting in CO2 concentrations higher than the predicted end-of-century concentration for open oceans. In contrast, warming can be expected to directly affect MZP and strengthen its coupling with phytoplankton by enhancing its grazing pressure.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...