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  • 1
    Electronic Resource
    Electronic Resource
    Photosynthesis, respiration and calcification of a zooxanthellate scleractinian coral under submerged and exposed conditions (1997)
    Springer
    Marine biology 129 (1997), S. 175-182 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An experimental set-up was designed to investigate photosynthesis, respiration and calcification of zooxanthellate scleractinian corals under submerged and exposed conditions. The results of experiments to determine the effect of exposure to air on the metabolism of Stylophora pistillata (Esper, 1797) revealed that: (1) maximum gross photosynthesis ( p g max) is 3.6 times higher in water than in air; (2) an indicator of photoadaptation (I k ) does not reveal any difference between water and air; (3) the difference between submerged and aerial respiration is not statistically significant; (4) aerial photosynthesis–irradiance (P–I) curves display lower initial slopes (α) than aquatic P–I curves; (5) there is no calcification in air.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050158
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An improved 45Ca protocol for investigating physiological mechanisms in coral calcification (1995)
    Springer
    Marine biology 122 (1995), S. 453-459 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A sensitive experimental protocol using cloned corals (hereafter “microcolonies”) of the branching scleractinian coral Stylophora pistillata and 45Ca has been developed to enable reproducible measurements of physiological and biochemical mechanisms involved in calcium transport and compartmentalization during coral calcification. Cloned S. pistillata microcolonies were propagated in the laboratory from small fragments of parent colonies collected in 1990 in the Gulf of Aqaba, Jordan. Cloned microcolonies have several intrinsic properties that help to reduce unwanted biological variability: (1) same genotype; (2) similar sizes and shapes; and (3) absence of macroscopic boring organisms. Errors specifically associated with long-standing problems to do with isotopic exchange were further reduced by producing microcolonies with no skeletal surfaces exposed to the radioisotope-labelled incubation medium. The value of the technique resides principally in its superior ability to elucidate transportation pathways and processes and not in its ability to quantitatively estimate calcium deposition by corals in nature. We describe here a rapidly exchangeable calcium pool in which up to 90% of the radioactive label taken up during incubations is located. This pool (72.9±1.4 nmol Ca mg-1 protein) is presumably located within the coelenteric cavity as suggested by the following: (1) it has 4-min half-time saturation kinetics; (2) the accumulation of calcium is linearly correlated with the calcium concentration of sea-water; and (3) its insensitivity to metabolic and ion transport inhibitors indicate that membranes do not isolate this compartment. Washout of this large extracellular pool greatly improved estimates of calcium deposition as evidenced by 10 to 40% reduction in coefficients of variation when compared with previous 45Ca2+ methods described in the literature. Comparisons of calcification measurements simultaneously carried out using the alkalinity anomaly technique and the 45Ca protocol described here show that the correlation coefficient of both techniques is close to 1. Unlike previous reports, our 45Ca2+-derived measurements are slightly lower than those computed from the alkalinity depletion technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350879
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Biomass, Production and Grazing Rates of Pico- and Nanoplankton in Coral Reef Waters (Miyako Island, Japan) (1998)
    Springer
    Microbial ecology 35 (1998), S. 46-57 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Concentrations of phytoplankton (cyanobacteria, autotrophic flagellates, and microphytoplankton) and planktonic microorganisms (bacteria, heterotrophic flagellates, and ciliates) were measured in the water over a fringing coral reef at Miyako Island (Japan). Their in situ growth and production rates, as well as their grazing rates, were estimated using diffusion chambers. Bacteria dominated the heterotrophic biomass (37–73% of total C), whereas nanoflagellates dominated the autotrophic biomass (65–75% of total autotropic C). Growth and production rates showed that these microbial populations over the reef were in a very dynamic state: growth rates ranged between 2 and 4 doublings day−1 for the bacteria, and between 1.5 and 3 doublings day−1 for the auto- and heterotrophic pico- and nanoplankton. This led to high production rates (10–25 μg C liter−1 day−1 for bacteria and flagellates). The microbial biomass was removed rapidly, since 60–70% of the bacterial production and 30–50% of the autotrophic production were grazed by the heterotrophic flagellates and ciliates, which themselves were grazed (50–70% of the production) by the higher trophic levels. These results suggest that dissolved organic matter was continuously channeled through the microbial loop to the higher trophic levels and the microbes had an important trophic role in terms of nutrient for the benthic organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    CARBON AND CARBONATE METABOLISM IN COASTAL AQUATIC ECOSYSTEMS (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 29 (1998), S. 405-434 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The coastal zone is where land, ocean, and atmosphere interact. It exhibits a wide diversity of geomorphological types and ecosystems, each one displaying great variability in terms of physical and biogeochemical forcings. Despite its relatively modest surface area, the coastal zone plays a considerable role in the biogeochemical cycles because it receives massive inputs of terrestrial organic matter and nutrients, is among the most geochemically and biologically active areas of the biosphere, and exchanges large amounts of matter and energy with the open ocean. Coastal ecosystems have therefore attracted much attention recently and are the focus of several current national and international research programs (e.g. LOICZ, ELOISE). The primary production, respiration, calcification, carbon burial and exchange with adjacent systems, including the atmosphere, are reviewed for the major coastal ecosystems (estuaries, macrophyte communities, mangroves, coral reefs, and the remaining continental shelf). All ecosystems examined, except estuaries, are net autotrophic. The contribution of the coastal zone to the global carbon cycle both during pristine times and at present is difficult to assess due to the limited metabolic data available as well as because of major uncertainties concerning the magnitude of processes such as respiration, exchanges at the open ocean boundary, and air-sea fluxes of biogases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ecolsys.29.1.405
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of nutrient enrichment on growth and photosynthesis of the zooxanthellate coral Stylophora pistillata (2000)
    Springer
    Coral reefs 19 (2000), S. 103-113 
    Details
    ISSN: 1432-0975
    Keywords: Keywords Coral ; Nitrogen ; Phosphorus ; Eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract  The effect of prolonged (9 week) nutrient enrichment on the growth and photosynthetic rates of the zooxanthellate coral Stylophora pistillata was investigated. The main questions were: (1) what is the exposure time needed to induce measurable change in growth rate? (2) which are the concentrations of nitrogen and phosphorus required to cause changes in these rates? (3) what is the recovery potential of the corals after the nutrient stress? For this purpose, three tanks (N, P, NP) were enriched with ammonium (N), phosphorus (P) or both nutrients (NP), respectively. A fourth tank (C) served as a control. The growth of 40 nubbins (10 in each tank) was monitored during four periods: period 1 (nutrient-poor conditions), period 2 (10 μm NH4 and/or 2 μm PO4 enrichment), period 3 (20 μm NH4 and/or 2 μm PO4) and period 4 (nutrient-poor conditions). Period 4 was performed to study the recovery potential of corals after a nutrient stress. During period 1, growth rates remained constant in all tanks. In the P tank, growth rates declined during the two enrichment periods, with a total decrease of 60% by the end of period 3. In the N tank, growth rates remained nearly constant during period 2 but decreased in period 3 (60% decrease). In the NP tank, 50% and 25% decreases were observed during periods 2 and 3. At the end of the recovery period, a regain in growth rate was observed in the N and NP tanks (35 and 30% increase, respectively, compared with the rates measured at the end of period 3) and growth rates returned to 60% of the initial rates. By contrast, in the P tank, there was no regain in growth and a further decrease of 5% was observed. Rates of photosynthesis were often higher during the enriched than the nutrient-poor period (up to 150% increase). Corals with the highest percent increases in maximal gross photosynthetic rate (P g max ) had the smallest decreases in growth rate due to nutrient enrichment. In conclusion, high ammonium (20 μm) and relatively low phosphorus concentrations (2 μm) are required to induce a significant decrease in coral growth rate. The largest reduction was observed with both ammonium and phosphorus enrichment. The decrease in growth rate was rapid following nutrient enrichment, since a 10% decrease or more could be observed after the first week of treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003380000078
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Physiology and taxonomy of scleractinian corals: a case study in the genus Stylophora (1991)
    Springer
    Coral reefs 9 (1991), S. 173-182 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The morphology and skeletal characteristics of colonies of the coral genus Stylophora living on the reef edge at 1 m depth on the Jordanian coast of the Gulf of Aqaba (Red Sea) are those of S. mordax (Dana 1846) which has not been reported previously from that area. These colonies were considered earlier as ecomorphs of S. pistillata (Esper 1797) which lives down to at least 67 m on the reef slopes. Growth, organic content and metabolism were compared in colonies living at different depths (1,5,10 and 30 m). The trends of twelve parameters between 1 and 5 m were different from the variation observed between 5 and 30 m. Colonies living at 1 m have a higher chlorophyll content but a lower metabolic activity and growth rate than colonies living at 5 m. Most of these pecularities cannot be explained by the influence of environmental factors. It is therefore suggested that S. mordax is a valid taxon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290419
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  • 7
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    Sink and swim: a status review of thecosome pteropod culture techniques (2014)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 36 (2). pp. 299-315.
    Details
    Publication Date: 2019-09-24
    Description: The widespread distribution of pteropods, their role in ocean food webs and their sensitivity to ocean acidification and warming has renewed scientific interest in this group of zooplankton. Unfortunately, their fragile shell, sensitivity to handling, unknowns surrounding buoyancy regulation and poorly described feeding mechanisms make thecosome pteropods notoriously difficult to maintain in the laboratory. The resultant high mortality rates and unnatural behaviours may confound experimental findings. The high mortality rate also discourages the use of periods of acclimation to experimental conditions and precludes vital long-term studies. Here we summarize the current status of culture methodology to provide a comprehensive basis for future experimental work and culture system development
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1093/plankt/fbu002
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Taking action against ocean acidification: A review of management and policy options (2013)
    Springer
    In:  Environmental Management, 52 (4). pp. 761-779.
    Details
    Publication Date: 2018-09-12
    Description: Ocean acidification has emerged over the last two decades as one of the largest threats to marine organisms and ecosystems. However, most research efforts on ocean acidification have so far neglected management and related policy issues to focus instead on understanding its ecological and biogeochemical implications. This shortfall is addressed here with a systematic, international and critical review of management and policy options. In particular, we investigate the assumption that fighting acidification is mainly, but not only, about reducing CO2 emissions, and explore the leeway that this emerging problem may open in old environmental issues. We review nine types of management responses, initially grouped under four categories: preventing ocean acidification; strengthening ecosystem resilience; adapting human activities; and repairing damages. Connecting and comparing options leads to classifying them, in a qualitative way, according to their potential and feasibility. While reducing CO2 emissions is confirmed as the key action that must be taken against acidification, some of the other options appear to have the potential to buy time, e.g. by relieving the pressure of other stressors, and help marine life face unavoidable acidification. Although the existing legal basis to take action shows few gaps, policy challenges are significant: tackling them will mean succeeding in various areas of environmental management where we failed to a large extent so far.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1007/s00267-013-0132-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Preface "Arctic ocean acidification: pelagic ecosystem and biogeochemical responses during a mesocosm study" (2013)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 10 (8). pp. 5619-5626.
    Details
    Publication Date: 2019-09-23
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/bg-10-5619-2013
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Effect of increased pCO2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord (2013)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 10 (1). pp. 315-325.
    Details
    Publication Date: 2019-09-23
    Description: The effect of ocean acidification on the balance between gross community production (GCP) and community respiration (CR) (i.e., net community production, NCP) of plankton communities was investigated in summer 2010 in Kongsfjorden, west of Svalbard. Surface water, which was characterized by low concentrations of dissolved inorganic nutrients and chlorophyll a (a proxy of phytoplankton biomass), was enclosed in nine mesocosms and subjected to eight pCO2 levels (two replicated controls and seven enhanced pCO2 treatments) for one month. Nutrients were added to all mesocosms on day 13 of the experiment, and thereafter increase of chlorophyll a was provoked in all mesocosms. No clear trend in response to increasing pCO2 was found in the daily values of NCP, CR, and GCP. For further analysis, these parameters were cumulated for the following three periods: phase 1 – end of CO2 manipulation until nutrient addition (t4 to t13); phase 2 – nutrient addition until the second chlorophyll a minimum (t14 to t21); phase 3 – the second chlorophyll a minimum until the end of this study (t22 to t28). A significant response was detected as a decrease of NCP with increasing pCO2 during phase 3. CR was relatively stable throughout the experiment in all mesocosms. As a result, the cumulative GCP significantly decreased with increasing pCO2 during phase 3. After the nutrient addition, the ratios of cumulative NCP to cumulative consumption of NO3 and PO4 showed a significant decrease during phase 3 with increasing pCO2. The results suggest that elevated pCO2 influenced cumulative NCP and stoichiometric C and nutrient coupling of the plankton community in a high-latitude fjord only for a limited period. However provided that there were some differences or weak correlations between NCP data based on different methods in the same experiment, this conclusion should be taken with caution.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/bg-10-315-2013
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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