Does seawater acidification affect zooxanthellae density and health in the invasive upside‐down jellyfish, Cassiopea spp.?

2019 ◽  
Vol 138 (3) ◽  
Author(s):  
Chelsea Weeks ◽  
Shawn Meagher ◽  
Philip Willink ◽  
Kenneth W. McCravy
Keyword(s):  
Seawater Acidification ◽  
Zooxanthellae Density

Seawater acidification affects the immune enzyme activities of the Manila clam Ruditapes philippinarum

2018 ◽  
Vol 36 (5) ◽  
pp. 1688-1696 ◽  
Author(s):  
Zhongming Huo ◽  
Xiangyu Meng ◽  
Rbbani Md.Golam ◽  
Weinan Cao ◽  
Qidi Wu ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Ruditapes Philippinarum ◽  
Manila Clam ◽  
Seawater Acidification

scholarly journals Does ocean acidification induce an upward flux of marine aggregates?

2008 ◽  
Vol 5 (4) ◽  
pp. 1023-1031 ◽  
Author(s):  
X. Mari
Keyword(s):  
Ocean Acidification ◽  
Atmospheric Carbon Dioxide ◽  
New Caledonia ◽  
Seawater Acidification ◽  
Seawater Ph ◽  
Biogenic Carbon ◽  
Marine Aggregates ◽  
Atmospheric Carbon ◽  
Carbon Dioxide Co2 ◽  
Sedimentation Processes

Abstract. The absorption of anthropogenic atmospheric carbon dioxide (CO2) by the ocean provokes its acidification. This acidification may alter several oceanic processes, including the export of biogenic carbon from the upper layer of the ocean, hence providing a feedback on rising atmospheric carbon concentrations. The effect of seawater acidification on transparent exopolymeric particles (TEP) driven aggregation and sedimentation processes were investigated by studying the interactions between latex beads and TEP precursors collected in the lagoon of New Caledonia. A suspension of TEP and beads was prepared and the formation of mixed aggregates was monitored as a function of pH under increasing turbulence intensities. The pH was controlled by addition of sulfuric acid. Aggregation and sedimentation processes driven by TEP were drastically reduced when the pH of seawater decreases within the expected limits imposed by increased anthropogenic CO2 emissions. In addition to the diminution of TEP sticking properties, the diminution of seawater pH led to a significant increase of the TEP pool, most likely due to swollen structures. A diminution of seawater pH by 0.2 units or more led to a stop or a reversal of the downward flux of particles. If applicable to oceanic conditions, the sedimentation of marine aggregates may slow down or even stop as the pH decreases, and the vertical flux of organic carbon may reverse. This would enhance both rising atmospheric carbon and ocean acidification.

Will temperature and salinity changes exacerbate the effects of seawater acidification on the marine microalga Phaeodactylum tricornutum?

2018 ◽  
Vol 634 ◽  
pp. 87-94 ◽  
Author(s):  
Esther Bautista-Chamizo ◽  
Marta Sendra ◽  
Ángeles Cid ◽  
Marta Seoane ◽  
Manoela Romano de Orte ◽  
...  
Keyword(s):  
Phaeodactylum Tricornutum ◽  
Seawater Acidification ◽  
Salinity Changes ◽  
Marine Microalga

scholarly journals Paracellular transport to the coral calcifying medium: effects of environmental parameters

2020 ◽  
Vol 223 (17) ◽  
pp. jeb227074 ◽  
Author(s):  
Alexander A. Venn ◽  
Coralie Bernardet ◽  
Apolline Chabenat ◽  
Eric Tambutté ◽  
Sylvie Tambutté
Keyword(s):  
Environmental Parameters ◽  
Intercellular Junctions ◽  
Paracellular Permeability ◽  
Paracellular Transport ◽  
Medium Effects ◽  
Stylophora Pistillata ◽  
Seawater Acidification ◽  
Imaging Approach ◽  
Transport Of Ions

ABSTRACTCoral calcification relies on the transport of ions and molecules to the extracellular calcifying medium (ECM). Little is known about paracellular transport (via intercellular junctions) in corals and other marine calcifiers. Here, we investigated whether the permeability of the paracellular pathway varied in different environmental conditions in the coral Stylophora pistillata. Using the fluorescent dye calcein, we characterised the dynamics of calcein influx from seawater to the ECM and showed that increases in paracellular permeability (leakiness) induced by hyperosmotic treatment could be detected by changes in calcein influx rates. We then used the calcein-imaging approach to investigate the effects of two environmental stressors on paracellular permeability: seawater acidification and temperature change. Under conditions of seawater acidification (pH 7.2) known to depress pH in the ECM and the calcifying cells of S. pistillata, we observed a decrease in half-times of calcein influx, indicating increased paracellular permeability. By contrast, high temperature (31°C) had no effect, whereas low temperature (20°C) caused decreases in paracellular permeability. Overall, our study establishes an approach to conduct further in vivo investigation of paracellular transport and suggests that changes in paracellular permeability could form an uncharacterised aspect of the physiological response of S. pistillata to seawater acidification.

Physiological and biochemical responses of Thalassiosira weissflogii (diatom) to seawater acidification and alkalization

2019 ◽  
Vol 76 (6) ◽  
pp. 1850-1859 ◽  
Author(s):  
Futian Li ◽  
Jiale Fan ◽  
Lili Hu ◽  
John Beardall ◽  
Juntian Xu
Keyword(s):  
Biogenic Silica ◽  
Dark Respiration ◽  
Silica Content ◽  
Thalassiosira Weissflogii ◽  
Carbon Export ◽  
Seawater Acidification ◽  
Carbon Pump ◽  
Potential Impact ◽  
Metabolic Activities ◽  
And Function

AbstractIncreasing atmospheric pCO2 leads to seawater acidification, which has attracted considerable attention due to its potential impact on the marine biological carbon pump and function of marine ecosystems. Alternatively, phytoplankton cells living in coastal waters might experience increased pH/decreased pCO2 (seawater alkalization) caused by metabolic activities of other photoautotrophs, or after microalgal blooms. Here we grew Thalassiosira weissflogii (diatom) at seven pCO2 levels, including habitat-related lowered levels (25, 50, 100, and 200 µatm) as well as present-day (400 µatm) and elevated (800 and 1600 µatm) levels. Effects of seawater acidification and alkalization on growth, photosynthesis, dark respiration, cell geometry, and biogenic silica content of T. weissflogii were investigated. Elevated pCO2 and associated seawater acidification had no detectable effects. However, the lowered pCO2 levels (25 ∼ 100 µatm), which might be experienced by coastal diatoms in post-bloom scenarios, significantly limited growth and photosynthesis of this species. In addition, seawater alkalization resulted in more silicified cells with higher dark respiration rates. Thus, a negative correlation of biogenic silica content and growth rate was evident over the pCO2 range tested here. Taken together, seawater alkalization, rather than acidification, could have stronger effects on the ballasting efficiency and carbon export of T. weissflogii.

scholarly journals Transcriptomic responses to seawater acidification among sea urchin populations inhabiting a natural pH mosaic

2017 ◽  
Vol 26 (8) ◽  
pp. 2257-2275 ◽  
Author(s):  
Tyler G. Evans ◽  
Melissa H. Pespeni ◽  
Gretchen E. Hofmann ◽  
Stephen R. Palumbi ◽  
Eric Sanford
Keyword(s):  
Sea Urchin ◽  
Seawater Acidification ◽  
Transcriptomic Responses
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