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New peer-reviewed papers

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Nov 26, 2014 7:48 AM
Physiological and biochemical responses of diatoms to projected ocean changes
With progressive future global change, marine phytoplankton in surface oceans will be subjected to ocean acidification, as well as to increased solar exposures and decreased vertical transport of nutrients from depth due to increasing stratification. We employed a simultaneous multivariate treatment approach to investigate the physiological and biochemical responses of the diatoms Thalassiosira pseudonana and […]

Nov 26, 2014 7:38 AM
How good are we at assessing the impact of ocean acidification in coastal systems? Limitations, omissions and strengths of commonly used experimental approaches with a special emphasis on the neglected role of fluctuations
Much of our past research on ocean acidification has focussed on direct responses to pCO2 increase at the (sub-) organism level, but does not produce findings that can be projected into the natural context. Based on a review of about 350 recent articles mainly on ocean acidification effects, we highlight major limitations of commonly used […]

Nov 25, 2014 2:29 AM
Uncertainties in measurements of ocean carbon dioxide levels
Carbon dioxide (CO2) emissions are not affecting only the atmosphere: 30% of anthropogenic CO2 emissions were absorbed by the oceans in the past few decades, recent estimates show. However, Kouketsu and Murata note that these estimates are based entirely on research that was conducted in the 1990s and that more recent measurements of oceanic CO2 […]

Nov 25, 2014 2:13 AM
Coccolithophore calcification response to past ocean acidification and climate change
Anthropogenic carbon dioxide emissions are forcing rapid ocean chemistry changes and causing ocean acidification (OA), which is of particular significance for calcifying organisms, including planktonic coccolithophores. Detailed analysis of coccolithophore skeletons enables comparison of calcite production in modern and fossil cells in order to investigate biomineralization response of ancient coccolithophores to climate change. Here we […]

Nov 24, 2014 5:49 AM
Ocean acidification rapidly reduces dinitrogen fixation associated with the hermatypic coral Seriatopora hystrix
Since productivity and growth of coral-associated dinoflagellate algae is nitrogen (N)-limited, dinitrogen (N2) fixation by coral-associated microbes is likely crucial for maintaining the coral-dinoflagellate symbiosis. It is thus essential to understand the effects future climate change will have on N2 fixation by the coral holobiont. This laboratory study is the first to investigate short-term effects […]

Nov 24, 2014 5:24 AM
New maps show Bering Sea holds world’s most acidic ocean waters
The world’s most acidic ocean waters are found in the winter in the Bering Sea, according to studies by scientists at Columbia University’s Lamont-Doherty Earth Observatory who have released a series of maps tracking changes in global marine acidity. With its broad continental shelf, shallow waters, ocean currents that deposit nutrients from around the world, and […]

Nov 24, 2014 5:09 AM
Corallina and Ellisolandia (Corallinales, Rhodophyta) photophysiology over daylight tidal emersion: interactions with irradiance, temperature and carbonate chemistry
The photophysiology of three geniculate coralline algal species (Corallina officinalis, C. caespitosa and Ellisolandia elongata) was determined in intertidal rock pools in the south-west UK at Combe Martin (51°12′31N 4°2′19W) and Heybrook Bay (50°31′66N 4°11′41W), at the start, middle and end of summer (September 1 and 2) and winter (February 9 and 10) daylight tidal […]

Nov 24, 2014 4:57 AM
Ocean acidification and warming alter photosynthesis and calcification of the symbiont-bearing foraminifera Marginopora vertebralis
The impact of elevated CO2 and temperature on photosynthesis and calcification in the symbiont-bearing benthic foraminifer Marginopora vertebralis was studied. Individual specimens of M. vertebralis were collected from Heron Island on the southern Great Barrier Reef (Australia). They were maintained for 5 weeks at different temperatures (28, 32 °C) and pCO2 (400, 1,000 µatm) levels […]

Nov 24, 2014 4:15 AM
Prolonged SDA and reduced digestive efficiency under elevated CO2 may explain reduced growth in Atlantic cod (Gadus morhua)
Land-based aquaculture systems expose fish to elevated dissolved CO2 levels, a factor that is correlated with reduced growth, feed conversion efficiency and body condition index. The physiological basis underlying the pathological effects of environmental hypercapnia is poorly understood, in particular for marine fish species. We investigated whether changes in energy expenditure and the specific dynamic […]

Nov 24, 2014 4:03 AM
Long-term mesocosms study of the effects of ocean acidification on growth and physiology of the sea urchin Echinometra mathaei
Recent research on the impact of ocean acidification (OA) has highlighted that it is important to conduct long-term experiments including ecosystem interactions in order to better predict the possible effects of elevated pCO2. The goal of the present study was to assess the long-term impact of OA on a suite of physiological parameters of the […]