Marine calcifiers exhibit mixed responses to CO2-induced ocean acidification

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

Eighteen marine species exposed to ocean acidification conditions for 60 days exhibited a wide range of responses. Ten of the 18 species were affected negatively with lower rates of net calcification and, in some cases, net loss of shell. Those species included temperate corals, pencil urchins, hard clams, conchs, serpulid ...

Volcanic carbon dioxide vents show ecosystem effects of ocean acidification

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

This study showed the effects of ocean acidification on ecosystems at coastal sites where volcanic CO2 vents lower the pH of the water. Along gradients of normal pH (8.1–8.2) to lowered pH (mean 7.8–7.9, minimum 7.4–7.5), typical rocky shore communities with abundant calcareous organisms shifted to communities lacking scleractinian corals ...

Elevated CO2 levels affect the activity of nitrate reductase and carbonic anhydrase in the calcifying rhodophyte Corallina officinalis

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

A coralline alga took up and used carbon and nutrients differently when living under ocean acidification conditions for 12 weeks, and the changes affected its ability to compete with other macroalgae (seaweed). (Laboratory study)

Coralline algal structure is more sensitive to rate, rather than magnitude, of ocean acidification.

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

When exposed to ocean acidification conditions (pH 7.7) for 80 days, coralline algae survived by increasing their calcification rates. However, those algae for which the pH had been dropped rapidly, rather than slowly and gradually, exhibited weaknesses in their calcite skeletons. (Laboratory study)

Early reproductive stages in the crustose coralline alga Phymatolithon lenormandii are strongly affected by mild acidification

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

In the early life stages of a coralline alga, mortality and growth abnormalities increased with small changes in pH. However, rate of growth remained similar, potentially by re-directing energy from other life processes. (Laboratory study)

Calcification of the Arctic coralline red algae Lithothamnion glaciale in response to elevated CO2

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

The calcium carbonate skeleton of a coralline red alga was estimated to become highly vulnerable to dissolving at an aragonite saturation state between 1.1 and 0.9, which is projected to occur in some parts of the Arctic between 2030 and 2050 if carbon emissions follow "business as usual" scenarios. (Laboratory ...

The effect of chronic and acute low pH on the intracellular DMSP production and epithelial cell morphology of red coralline algae

  • Posted on: Mon, 06/13/2016 - 05:56
  • By: Anonymous

The release of dimethylsulphoniopropionate (DMSP) by marine algae has major impacts on the global sulphur cycle and may influence local climate through the formation of dimethylsulphide (DMS). However, the effect of global change on DMSP/DMS (DMS(P)) production by algae is not well understood. This study examined the effect of low pH ...

Pages