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Blog Profile / Ocean Acidification

Filed Under:Biology / Marine Biology
Posts on Regator:4431
Posts / Week:21.2
Archived Since:July 23, 2010

Blog Post Archive

Lecture: Sensitivity of coral trout (Plectropomus) to increasing temperature, ocean acidification and habitat degradation

Presented by: Prof Morgan Pratchett, ARC CoE Coral Reef Studies, Townsville When: Thursday, 24th of July 2014; 12:00 to 13:00 hrs Where: Building 19 (Kevin Stark Research Building), Room #106 (upstairs), JCU, Townsville. Video-linked to the University of Queensland (GCI Boardroom, Level 7, Gehrmann Building 60. Show More Summary

Processes determining the marine alkalinity and carbonate saturation distributions

We introduce a composite tracer, Alk, that has a global distribution primarily determined by CaCO3 precipitation and dissolution. Alk also highlights riverine alkalinity plumes that are due to dissolved calcium carbonate from land. We estimate the Arctic receives approximately twice the riverine alkalinity per unit area as the Atlantic, and 8 times that of the […]

The Thing You Can’t Measure: Ocean Acidification Threatens Culture and Identity in New Zealand

These last two weeks, I have shared stories of how ocean acidification could affect economies around the world. These tangible impacts can be measured by changes in jobs, access to resources and overall economic condition. But what about the impacts you can’t measure? What will those changes be, and how will they affect people? Throughout […]

Race on to save endangered Cayman corals

Local and international marine experts are joining forces in the ocean around Little Cayman on an important conservation project to try and understand and then save endangered local coral species. The plight of the now critically endangered staghorn coral, which was once one of the most abundant corals on Caribbean reefs, is at the top […]

Coping with climate change? Copepods experience drastic variations in their physicochemical environment on a diurnal basis

Migratory zooplankton, such as copepods experience widely varying conditions in their physicochemical environment on a diurnal basis. The amplitude of the fluctuations may affect the copepods’ ability to respond to climate change. The...Show More Summary

Effects of different salinities and pH on the growth and proximate composition of Nannochloropsis sp. and Tetraselmis sp. isolated from South China Sea cultured under control and natural condition

Nannochloropsis sp. and Tetraselmis sp. are widely used in aquaculture as a source of protein, lipid and carbohydrate. The growth and proximate composition of microalgae could be affected by different culture conditions especially salinity, temperature and light. Show More Summary

Laboratory experiment investigating the impact of ocean acidification on calcareous organisms

The increase in ocean acidity since preindustrial times may have deleterious consequences for marine organisms, particularly those with calcareous structures. We present a laboratory experiment to investigate this impact with general, introductory, environmental, and nonmajors chemistry students. Show More Summary

Acid in the ocean? FL reefs swallow bitter pill of carbon pollution

MIAMI – This weekend, thousands of people will enjoy Florida’s beaches, but many may not realize the saltwater they’re swimming in is becoming increasingly acidic. Another unpleasant side effect of global warming, ocean acidification is a steady decrease in the pH levels of ocean water, and scientists say it’s caused by an increase of carbon […]

Ocean acidification increases copper toxicity to the early life-history stages of the polychaete Arenicola marina in artificial seawater

The speciation and therefore bioavailability of the common pollutant copper is predicted to increase within the pH range anticipated under near-future ocean acidification (OA), hence the potential exists for copper toxicity to marine organisms to also increase. We investigated the impact of OA (seawater pH values of 7.77 (pCO2 1400 µatm) and 7.47 (pCO2 3000 […]

NOAA grant opportunity: OA in the context of eutrophication, hypoxia and other stresses in coastal environments

The NOAA Ocean Acidification Program and the NOAA National Centers for Coastal Ocean Science have announced a new availability for grant funds for the fiscal year 2015. The funding opportunity, titled “Regional Ecosystem Prediction Program;...Show More Summary

Millennial-scale ocean acidification and late Quaternary decline of cryptic bacterial crusts in tropical reefs

Ocean acidification by atmospheric carbon dioxide has increased almost continuously since the last glacial maximum (LGM), 21 000 years ago. It is expected to impair tropical reef development, but effects on reefs at the present day and in the recent past have proved difficult to evaluate. We present evidence that acidification has already significantly reduced […]

Acclimation potential to a future ocean acidification scenario in the key copepod species Calanus finmarchicus

Ocean acidification, as a result of the increased concentration of carbon dioxide in the ocean, poses a threat towards marine ecosystems through lowered pH and altered seawater chemistry. The marine copepod Calanus finmarchicus is an ecologically and socioeconomically important species. Show More Summary

Interaction effects of ocean acidification and warming on the marine copepod Calanus finmarchicus (MSc thesis)

Ocean acidification and concurring warming of the oceans poses an ongoing threat to marine organisms, but little is known about their combined effects. The boreal calanoid copepod Calanus finmarchicus is a key stone species in North Atlantic Ocean and adverse effects of concurring OA and warming could have major impacts for ecosystem structure and function. […]

Underwater meadows might serve as antacid for acid seas (text & audio)

The world’s oceans are changing — chemically changing. As people put more carbon dioxide into the atmosphere, the oceans absorb more of it, and that’s making the water more acidic. The effects are subtle in most places, but scientists say that if this continues, it could be a disaster for marine life. In fact, some […]

Increasing coccolith calcification during CO2 rise of the penultimate deglaciation (Termination II)

Glacial to interglacial environmental changes have a strong impact on coccolithophore assemblage composition. At the same time, glacial terminations are characterised by an increase in atmospheric CO2 concentration. In order to determine...Show More Summary

Effects of ocean acidification and warming on the mitochondrial physiology of Atlantic cod

The Atlantic cod (Gadus morhua) is an economically important marine fish species exploited by both fishery and aquaculture, especially in the North Atlantic and Arctic oceans. Ongoing climate changes are happening faster in the high latitude oceans with a higher increase of temperature and a steeper decrease in water pH due to anthropogenic CO2 than […]

Elevated CO2 alleviates high PAR and UV stress in the unicellular Chlorophyte Dunaliella tertiolecta

The effects of increased CO2 and irradiance on the physiological performance of the chlorophyte Dunaliella tertiolecta were studied at different PAR and UVR (UVA+UVB) irradiances, simulating the solar radiation at different depths, under present (390 ppmv, LC) and predicted CO2 levels for the year 2100 (1000 ppmv, HC). Elevated CO2 resulted in higher optimum and […]

iMarNet: an ocean biogeochemistry model inter-comparison project within a common physical ocean modelling framework

Ocean biogeochemistry (OBGC) models span a wide range of complexities from highly simplified, nutrient-restoring schemes, through nutrient-phytoplankton-zooplanktondetritus (NPZD) models that crudely represent the marine biota, through...Show More Summary

Scaling up experimental ocean acidification and warming research: from individuals to the ecosystem

Understanding long-term, ecosystem-level impacts of climate change is challenging because experimental research frequently focuses on short-term, individual-level impacts in isolation. We address this shortcoming first through an inter-disciplinary...Show More Summary

The future of coral reef algae: how ocean acidification, elevated temperatures and nutrient enrichment affect algae

Benthic algae are an important part of coral reef ecosystems, providing food and shelter for many organisms. However, algae are also powerful competitors for space. Their interactions with reef-building corals are of particular interest, as coral reef health is influenced by both herbivores and the dynamics of coral-algal interactions. Show More Summary

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