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
  • 1
    Online Resource
    Online Resource
    The combined effect of variable food supply and elevated CO2 partial pressure on feeding and calcification rates of the mediterranean cold-water coral Madrepora oculata (2011)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (111 Seiten = 4 MB) , Illustrationen, Graphen, Karten
    Edition: 2021
    URL: https://oceanrep.geomar.de/12980/
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 2
    facet.materialart.
    Unknown
    The combined effect of variable food supply and elevated CO2 partial pressure on feeding and calcification rates of the Mediterranean cold-water coral (2011)
    In:  (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 104 pp
    Details
    Publication Date: 2021-12-15
    Description: Only 50 % of today's anthropogenic C02 emissions stay in the atmosphere, while 25 % are absorbed by the world's oceans. The complex reactions of seawater with C02 cause fundamental changes to seawater carbonate chemistry, which already led to a decline in seawater pH by 0.1 units since pre-industrial times. Another consequence of the so-called "ocean acidification" (OA) is a decreasing seawater saturation state with respect to aragonite (Qar)- the material from which skeletons of scleractinian corals are built. Twenty-six individuals of the Mediterranean cold-water coral Madrepora oculata were incubated under two different feeding regimes, with the high (HF), respectively low feeding (LF) corals receiving freshly hatched Artemia nauplii five, respectively two times a week. To investigate the effects of OA on the corals, the animals were subsequently exposed to pC02 regimes of 380 (ambient pC02), 1600, 800, 2000 and 380 ppm for two weeks each. After each exposure, the corals were incubated in a closed system for 18 hours, followed by the measurement of the coral calcification rates (G) with the total alkalinity anomaly technique (G-TA). Additionally, G was determined with the buoyant weighing technique (G-bw). Every second week, POC and PON ingestion of the corals was measured. Feeding rates on POC were PON significantly affected by high pC02 conditions, with the lowest ingestion rates found at 2000 ppm for both feeding groups. Average G-TA was negative for 1600 and 2000 ppm and positive for ambient pC02 and 800 ppm, whether or not feeding regime was considered in the analyses. As seawater was under-saturated with respect to aragonite (Qar 〈 1) in the two highest pC02 treatments, this suggests a strong dependence of coral calcification on nar· The effect of pC02 on G-T A was highly significant (repeated measures ANOVA, p 〈〈 0.001), while G-bw was not significantly affected by pC02. A significant effect of the feeding regimes on G was not detected, either. However, the lowest, respectively highest feeding and calcification (G-TA) rates were found at 2000, respectively 800 ppm. This might indicate that Madrepora oculata exposed to medium pC02 ("medium" defined as 800 ppm in this study) is able to compensate for the effects of OA by an additional energy supply obtained from heterotrophic feeding. Another explanation might be a general insensitivity of Madrepora oculata to medium pC02. In either case, the corals most likely could still endangered by OA, as food concentrations in the oligotrophic Mediterranean Sea are low and pC02 could further rise to 1900 ppm by the end of the 23rd century.
    Type: Thesis , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Thesis - not published by a publisher
  • 3
    facet.materialart.
    Unknown
    Effects of elevated pCO2 and feeding on net calcification and energy budget of the Mediterranean cold-water coral Madrepora oculata (2016)
    PANGAEA
    In:  Supplement to: Maier, Cornelia; Popp, Pauline; Sollfrank, Nicole; Weinbauer, Markus G; Wild, Christian; Gattuso, Jean-Pierre (2016): Effects of elevated pCO2 and feeding on net calcification and energy budget of the Mediterranean cold-water coral Madrepora oculata. Journal of Experimental Biology, 219(20), 3208-3217, https://doi.org/10.1242/jeb.127159
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification is a major threat to calcifying marine organisms such as deep-sea cold-water corals (CWC), but related knowledge is scarce. The aragonite saturation threshold (Omega a) for calcification, respiration, and organic matter fluxes was investigated experimentally in the Mediterranean Madrepora oculata (Linnaeus 1758). Over 10 weeks, colonies were maintained under two feeding regimes (uptake of 36.75 and 7.46 µmol C/polyp/week) and exposed in 2 week intervals to a consecutively changing air-CO2 mix (pCO2) of 400, 1600, 800, 2000 and 400 ppm. There was a significant effect of feeding on calcification at initial ambient pCO2, while at consecutive pCO2 treatments feeding had no effect on calcification. Respiration was not significantly affected by feeding or pCO2 levels. Coral skeletons started to dissolve at an average Omega a threshold of 0.92, but recovered and started to calcify again at Omega a〉 or =1. The surplus energy required to counteract dissolution at elevated pCO2 (〉 or =1600µatm) was twice that at ambient pCO2. Yet, feeding had no mitigating effect at increasing pCO2 levels. This could be due to the fact that the energy required for calcification is a small fraction (1 to 3%) of the total metabolic energy demand and corals even under low food conditions might therefore still be able to allocate this small portion of energy to calcification. The response and resistance to ocean acidification is consequently not controlled by feeding in this species, but more likely by chemical reaction at the site of calcification and exchange processes between the calicoblastic layer and ambient seawater.
    Keywords: Alkalinity, total; Animalia; Aragonite saturation state; Area; Bari_Canyon_OA; Benthic animals; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate; Calcification rate of calcium carbonate; Calcite saturation state; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, total, change rate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cnidaria; Coral; Deep-sea; Dry mass; EXP; Experiment; Feeding mode; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gas, flux; Growth/Morphology; Incubation duration; Laboratory experiment; Madrepora oculata; Mediterranean Sea; OA-ICC; Ocean Acidification International Coordination Centre; Other; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon uptake rate; Percentage; pH; Polyp number; Pressure; Registration number of species; Respiration; Respiration rate, oxygen; Respiratory quotient; Salinity; Sample code/label; Sample type; Sampling date; Single species; Species; Temperate; Temperature, water; Treatment; Type; Uniform resource locator/link to reference; Volume
    Type: Dataset
    Format: text/tab-separated-values, 11229 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...