scholarly journals Ocean acidification but not warming alters sex determination in the Sydney rock oyster, Saccostrea glomerata

2018 ◽  
Vol 285 (1872) ◽  
pp. 20172869 ◽  
Author(s):  
Laura M. Parker ◽  
Wayne A. O'Connor ◽  
Maria Byrne ◽  
Michael Dove ◽  
Ross A. Coleman ◽  
...  
Keyword(s):  
Sex Determination ◽  
Ocean Acidification ◽  
Sex Ratios ◽  
Marine Organisms ◽  
Reproductive Capacity ◽  
Larval Supply ◽  
Rock Oyster ◽  
Saccostrea Glomerata ◽  
The Impact

Whether sex determination of marine organisms can be altered by ocean acidification and warming during this century remains a significant, unanswered question. Here, we show that exposure of the protandric hermaphrodite oyster, Saccostrea glomerata to ocean acidification, but not warming, alters sex determination resulting in changes in sex ratios. After just one reproductive cycle there were 16% more females than males. The rate of gametogenesis, gonad area, fecundity, shell length, extracellular pH and survival decreased in response to ocean acidification. Warming as a sole stressor slightly increased the rate of gametogenesis, gonad area and fecundity, but this increase was masked by the impact of ocean acidification at a level predicted for this century. Alterations to sex determination, sex ratios and reproductive capacity will have flow on effects to reduce larval supply and population size of oysters and potentially other marine organisms.

Populations of the Sydney rock oyster, Saccostrea glomerata, vary in response to ocean acidification

2010 ◽  
Vol 158 (3) ◽  
pp. 689-697 ◽  
Author(s):  
L. M. Parker ◽  
Pauline M. Ross ◽  
Wayne A. O’Connor
Keyword(s):  
Ocean Acidification ◽  
Rock Oyster ◽  
Saccostrea Glomerata

Electrochemical Characteristics of BIS 2062 Carbon Steel Under Simulated Ocean Acidification Scenario

2020 ◽  
Author(s):  
K R DEVIKA ◽  
P MUHAMED ASHRAF
Keyword(s):  
Climate Change ◽  
Carbon Steel ◽  
Ocean Acidification ◽  
Marine Environment ◽  
Research Paper ◽  
Marine Organisms ◽  
Natural Seawater ◽  
Electrochemical Characteristics ◽  
Boat Building ◽  
The Impact

Dear Professor,<div><p>I am herewith enclosing a research paper entitled “<b>Electrochemical characteristics of BIS 2062 carbon steel under simulated ocean acidification scenario.</b>” authored by Devika KR, and me. </p> <p>The research paper highlights the behavior of carbon steel in acidified natural seawater. Ocean acidification is a burning issue under climate change. Several studies have undertaken to understand the behavior marine organisms and marine environment. No studies have initiated regarding the deterioration of materials due to ocean acidification. Large number of materials were deployed in the ocean with different objectives. These materials are under risk as the ocean acidification continues. We believe this is the first attempt to study the impact of ocean acidification on carbon steel. </p> <p>The study conducted to evaluate the impact of ocean acidification on BIS 2062 boat building steel. The results showed that the carbon steel will deteriorate 2 to 3 times higher when pH was changed from 8.05 to 7.90. The data highlights the immediate need to redesign the marine materials within 1-2 decade. The paper also highlights the possible mechanism of deterioration under different pH scenario.</p><p>Thanking you</p><p>Sincerely</p><p>ashrafp</p><br></div>

scholarly journals The Impact of Ocean Acidification on Reproduction, Early Development and Settlement of Marine Organisms

Water ◽  
2011 ◽  
Vol 3 (4) ◽  
pp. 1005-1030 ◽  
Author(s):  
Pauline M. Ross ◽  
Laura Parker ◽  
Wayne A. O’Connor ◽  
Elizabeth A. Bailey
Keyword(s):  
Ocean Acidification ◽  
Early Development ◽  
Marine Organisms ◽  
The Impact

Copper and ocean acidification interact to lower maternal investment, but have little effect on adult physiology of the Sydney rock oyster Saccostrea glomerata

2018 ◽  
Vol 203 ◽  
pp. 51-60 ◽  
Author(s):  
Elliot Scanes ◽  
Laura M. Parker ◽  
Wayne A. O’Connor ◽  
Mitchell C. Gibbs ◽  
Pauline M. Ross
Keyword(s):  
Ocean Acidification ◽  
Maternal Investment ◽  
Rock Oyster ◽  
Saccostrea Glomerata

scholarly journals Continuous Monitoring and Future Projection of Ocean Warming, Acidification, and Deoxygenation on the Subarctic Coast of Hokkaido, Japan

2021 ◽  
Vol 8 ◽  
Author(s):  
Masahiko Fujii ◽  
Shintaro Takao ◽  
Takuto Yamaka ◽  
Tomoo Akamatsu ◽  
Yamato Fujita ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Ocean Acidification ◽  
Continuous Monitoring ◽  
Critical Level ◽  
Marine Organisms ◽  
Ocean Warming ◽  
Future Projection ◽  
Do Concentration ◽  
Biogeochemical Parameters ◽  
The Impact

As the ocean absorbs excessive anthropogenic CO2 and ocean acidification proceeds, it is thought to be harder for marine calcifying organisms, such as shellfish, to form their skeletons and shells made of calcium carbonate. Recent studies have suggested that various marine organisms, both calcifiers and non-calcifiers, will be affected adversely by ocean warming and deoxygenation. However, regardless of their effects on calcifiers, the spatiotemporal variability of parameters affecting ocean acidification and deoxygenation has not been elucidated in the subarctic coasts of Japan. This study conducted the first continuous monitoring and future projection of physical and biogeochemical parameters of the subarctic coast of Hokkaido, Japan. Our results show that the seasonal change in biogeochemical parameters, with higher pH and dissolved oxygen (DO) concentration in winter than in summer, was primarily regulated by water temperature. The daily fluctuations, which were higher in the daytime than at night, were mainly affected by daytime photosynthesis by primary producers and respiration by marine organisms at night. Our projected results suggest that, without ambitious commitment to reducing CO2 and other greenhouse gas emissions, such as by following the Paris Agreement, the impact of ocean warming and acidification on calcifiers along subarctic coasts will become serious, exceeding the critical level of high temperature for 3 months in summer and being close to the critical level of low saturation state of calcium carbonate for 2 months in mid-winter, respectively, by the end of this century. The impact of deoxygenation might often be prominent assuming that the daily fluctuation in DO concentration in the future is similar to that at present. The results also suggest the importance of adaptation strategies by local coastal industries, especially fisheries, such as modifying aquaculture styles.

scholarly journals Electrochemical Characteristics of BIS 2062 Carbon Steel Under Simulated Ocean Acidification Scenario

2020 ◽  
Author(s):  
K R DEVIKA ◽  
P MUHAMED ASHRAF
Keyword(s):  
Climate Change ◽  
Carbon Steel ◽  
Ocean Acidification ◽  
Marine Environment ◽  
Research Paper ◽  
Marine Organisms ◽  
Natural Seawater ◽  
Electrochemical Characteristics ◽  
Boat Building ◽  
The Impact

Dear Professor,<div><p>I am herewith enclosing a research paper entitled “<b>Electrochemical characteristics of BIS 2062 carbon steel under simulated ocean acidification scenario.</b>” authored by Devika KR, and me. </p> <p>The research paper highlights the behavior of carbon steel in acidified natural seawater. Ocean acidification is a burning issue under climate change. Several studies have undertaken to understand the behavior marine organisms and marine environment. No studies have initiated regarding the deterioration of materials due to ocean acidification. Large number of materials were deployed in the ocean with different objectives. These materials are under risk as the ocean acidification continues. We believe this is the first attempt to study the impact of ocean acidification on carbon steel. </p> <p>The study conducted to evaluate the impact of ocean acidification on BIS 2062 boat building steel. The results showed that the carbon steel will deteriorate 2 to 3 times higher when pH was changed from 8.05 to 7.90. The data highlights the immediate need to redesign the marine materials within 1-2 decade. The paper also highlights the possible mechanism of deterioration under different pH scenario.</p><p>Thanking you</p><p>Sincerely</p><p>ashrafp</p><br></div>

Ocean acidification narrows the acute thermal and salinity tolerance of the Sydney rock oyster Saccostrea glomerata

2017 ◽  
Vol 122 (1-2) ◽  
pp. 263-271 ◽  
Author(s):  
Laura M. Parker ◽  
Elliot Scanes ◽  
Wayne A. O'Connor ◽  
Ross A. Coleman ◽  
Maria Byrne ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Salinity Tolerance ◽  
Rock Oyster ◽  
Saccostrea Glomerata

scholarly journals Calcification responses of symbiotic and aposymbiotic corals to near-future levels of ocean acidification

2013 ◽  
Vol 10 (11) ◽  
pp. 6807-6814 ◽  
Author(s):  
S. Ohki ◽  
T. Irie ◽  
M. Inoue ◽  
K. Shinmen ◽  
H. Kawahata ◽  
...  
Keyword(s):  
Control System ◽  
Ocean Acidification ◽  
Industrial Revolution ◽  
Scleractinian Corals ◽  
Marine Organisms ◽  
Calcification Rate ◽  
Precise Control ◽  
Acropora Digitifera ◽  
The Impact ◽  
Near Future

Abstract. Increasing the acidity of ocean waters will directly threaten calcifying marine organisms such as reef-building scleractinian corals, and the myriad of species that rely on corals for protection and sustenance. Ocean pH has already decreased by around 0.1 pH units since the beginning of the industrial revolution, and is expected to decrease by another 0.2–0.4 pH units by 2100. This study mimicked the pre-industrial, present, and near-future levels of pCO2 using a precise control system (± 5% pCO2), to assess the impact of ocean acidification on the calcification of recently settled primary polyps of Acropora digitifera, both with and without symbionts, and adult fragments with symbionts. The increase in pCO2 of ~100 μatm between the pre-industrial period and the present had more effect on the calcification rate of adult A. digitifera than the anticipated future increases of several hundreds of micro-atmospheres of pCO2. The primary polyps with symbionts showed higher calcification rates than primary polyps without symbionts, suggesting that: (i) primary polyps housing symbionts are more tolerant to near-future ocean acidification than organisms without symbionts, and (ii) corals acquiring symbionts from the environment (i.e., broadcasting species) will be more vulnerable to ocean acidification than corals that maternally acquire symbionts.

scholarly journals Symbiosis increases coral tolerance to ocean acidification

2013 ◽  
Vol 10 (4) ◽  
pp. 7013-7030 ◽  
Author(s):  
S. Ohki ◽  
T. Irie ◽  
M. Inoue ◽  
K. Shinmen ◽  
H. Kawahata ◽  
...  
Keyword(s):  
Control System ◽  
Ocean Acidification ◽  
Industrial Revolution ◽  
Scleractinian Corals ◽  
Marine Organisms ◽  
Calcification Rate ◽  
Precise Control ◽  
Acropora Digitifera ◽  
The Impact ◽  
Near Future

Abstract. Increasing the acidity of ocean waters will directly threaten calcifying marine organisms such as reef-building scleractinian corals, and the myriad of species that rely on corals for protection and sustenance. Ocean pH has already decreased by around 0.1 pH units since the beginning of the industrial revolution, and is expected to decrease by another 0.2–0.4 pH units by 2100. This study mimicked the pre-industrial, present, and near-future levels of pCO2 using a precise control system (&amp;pm;5% pCO2), to assess the impact of ocean acidification on the calcification of recently-settled primary polyps of Acropora digitifera, both with and without symbionts, and adult fragments with symbionts. The increase in pCO2 of 100 μatm between the pre-industrial period and the present had more effect on the calcification rate of adult A. digitifera than the anticipated future increases of several hundreds of micro-atmospheres of pCO2. The primary polyps with symbionts showed higher calcification rates than primary polyps without symbionts, suggesting that (i) primary polyps housing symbionts are more tolerant to near-future ocean acidification than organisms without symbionts, and (ii) corals acquiring symbionts from the environment (i.e. broadcasting species) will be more vulnerable to ocean acidification than corals that maternally acquire symbionts.

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