Calcifying invertebrates succeed in a naturally CO2-rich coastal habitat but are threatened by high levels of future acidification

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

Blue mussels from the Kiel Fjord (Baltic Sea), where seawater pH tends to be low, were able to maintain growth rates when exposed to ocean acidification conditions (pH 7.7). in addition, juvenile mussels in the fjord settle mostly in summer when pH is lowest. The findings suggest that mussels may ...

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 ...

Deep-water prawn Pandalus borealis displays a relatively high pH regulatory capacity in response to CO2-induced acidosis

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

Deep-water prawns (Pandalus borealis) exposed to severely acidified seawater (pH 6.86) for 16 days were able to compensate by accumulate buffering bicarbonate ions at levels comparable to those reported for shallow-living decapod crustaceans. (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)

Interactive effects of ocean acidification and warming on subtidal mussels and sea stars from Atlantic Canada

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

Sea stars collected in Nova Scotia, Canada, grew more slowly under ocean acidification conditions, and their growth rate decreased further with a warmer temperature. In contrast, blue mussel grew more quickly with no response to temperature within the tested range. Predation of sea stars on mussels, measured as per-capita consumption ...

Sub-lethal effects of elevated concentration of CO2 on planktonic copepods and sea urchins

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

Under extreme ocean acidification conditions (pH 6.8), the egg production rates of copepods decreased significantly. For two species of sea urchins, fertilization rate of eggs decreased with increasing ocean acidification conditions. Furthermore, the size of urchin larvae decreased and deformities increased. These effects on marine life could lead to changes ...

Acidification and warming affect both a calcifying predator and prey, but not their interaction

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

Muscle length and claw strength of green crabs decreased after the crabs had been in ocean acidification conditions (pH 7.7) for 5 months. Periwinkles tended to have weaker shells in response to acidification. Predation by green crabs on periwinkles did not appear to change under ocean acidification conditions. (Laboratory study) ...

Species-specific responses to calcifying algae to changing seawater carbonate chemistry

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

Two species of phytoplankton (coccolithophores) had higher rates of deformities when pH of seawater in the laboratory was different from present-day ocean pH. Examination of geological samples of coccolithophores did not reveal higher levels of deformities, suggesting that coccolithophores have adapted to changes in ocean pH over geological time. ...

Sensitivity to ocean acidification parallels natural pCO2 gradients experienced by Arctic copepods under winter sea ice

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

Some copepods (Calanus species) in the Arctic routinely encounter a range of seawater pH levels each day as they migrate vertically in the ocean; they were not severely affected when exposed to ocean acidification conditions in the laboratory. In contrast, a copepod species (Oithona similis) that does not vertically migrate, ...

Skeletal alterations and polymorphism in a Mediterranean bryozan at natural CO2 vents.

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

Bryozoan colonies were grown at a site in the Tyrrhenian Sea (Italy) where natural emissions of carbon dioxide associated with volcanic activity lower seawater pH to 7.76, simulating levels of ocean acidification predicted for the end of the 21st century. The colonies showed impaired growth and had fewer defensive polymorphs. ...

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