Reference Library: pH

Economic impact of ocean acidification on shellfish production in Europe

  • Posted on: Wed, 02/22/2017 - 15:51
  • By: jackie

Ocean acidification (OA) is increasingly recognized as a major global problem. Despite the scientific evidence, economic assessments of its effects are few. This analysis is an attempt to perform a national and sub-national assessment of the economic impact of OA on mollusc production in Europe. We focus on mollusc production ...

Chemical and biological impacts of ocean acidification along the west coast of North America

  • Posted on: Fri, 12/16/2016 - 10:17
  • By: jackie

The continental shelf region off the west coast of North America is seasonally exposed to water with a low aragonite saturation state by coastal upwelling of CO2-rich waters. To date, the spatial and temporal distribution of anthropogenic CO2 (Canth) within the CO2-rich waters is largely unknown. Here we adapt the multiple ...

Water quality criteria for an acidifying ocean: Challenges and opportunities for improvement

  • Posted on: Tue, 11/01/2016 - 11:50
  • By: jackie

Acidification has sparked discussion about whether regulatory agencies should place coastal waters on the Clean Water Act 303(d) impaired water bodies list. Here we describe scientific challenges in assessing impairment with existing data, exploring use of both pH and biological criteria. Application of pH criteria is challenging because present coastal ...

Spectrophotometric measurement of freshwater pH with purified meta-cresol purple and phenol red

  • Posted on: Fri, 10/07/2016 - 15:52
  • By: jackie

Impurities in indicator salts can significantly bias spectrophotometric pH determinations. In this work, two purified sulfonephthalein indicators, meta-cresol purple (mCP) and phenol red (PR), were tested for analysis of freshwater pH on the free hydrogen ion concentration scale. The work presented here is the first parallel comparison with two purified indicators used to ...

Biocalcification in the eastern oyster (Crassostrea virginica) in relation to long-term trends in Chesapeake Bay pH

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

Estuarine waters are more susceptible to acidification because they are subject to multiple acid sources and are less buffered than marine waters. Consequently, estuarine shell-forming species may experience acidification sooner than marine species although, the tolerance of estuarine calcifiers to pH changes is poorly understood. This study analyzed 23 years ...

Size-dependent pH effect on calcification in post-larval hard clam Mercenaria spp.

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

The shell calcification rates of small hard clams in five size classes (0.39, 0.56, 0.78, 0.98, and 2.90 mm shell height) decreased with increasingly severe ocean acidification conditions (pH 8.02, 7.64, and 7.41). Clams in the larger sizes were able to deposit new shell material even under corrosive conditions. However, ...

Oyster shell dissolution rates in estuarine waters: Effects of pH and shell legacy

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

The shells of eastern oysters from the Chesapeake Bay dissolved at faster rates when exposed to increasingly severe ocean acidification conditions. Oysters with fresh shells dissolved at the fastest rate, followed by oysters with weathered shells and those with dredged shells. (Laboratory study)

Some like it hot: Temperature and pH modulate larval development and settlement of the sea urchin Arbacia lixula

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

Sea urchin larvae from the Mediterranean Sea survived at higher rates under ocean acidification conditions, but they grew smaller. Warmer temperatures increased survival and growth rates of the larvae. The results suggest that ocean acidification and warming could boost populations of the sea urchin, increasing its impact on shallow Mediterranean ...

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