News

Sensitivities to global change drivers may correlate positively or negatively in a foundational marine macroalga

Abstract.

"Ecological impact of global change is generated by multiple synchronous or asynchronous drivers which interact with each other and with intraspecific variability of sensitivities. In three near-natural experiments, we explored response correlations of full-sibling germling families of the seaweed Fucus vesiculosus towards four global change drivers: elevated CO2 (ocean acidification, OA), ocean warming (OW), combined OA and warming (OAW), nutrient enrichment and hypoxic upwelling. [...]"

Source: Scientific Reports
Authors: Balsam Al-Janabi et al.
DOI: 10.1038/s41598-019-51099-8

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The Dynamics and Impact of Ocean Acidification and Hypoxia:

Insights from Sustained Investigations in the Northern California Current Large Marine Ecosystem

Abstract.

"Coastal upwelling ecosystems around the world are defined by wind-generated currents that bring deep, nutrient-rich waters to the surface ocean where they fuel exceptionally productive food webs. These ecosystems are also now understood to share a common vulnerability to ocean acidification and hypoxia (OAH). In the California Current Large Marine Ecosystem (CCLME), reports of marine life die-offs by fishers and resource managers triggered research that led to an understanding of the risks posed by hypoxia. Similarly, unprecedented losses from shellfish hatcheries led to novel insights into the coastal expression of ocean acidification. [...]"

Source: Oceanography
Authors: Francis Chan et al.
DOI: 10.5670/oceanog.2019.312

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Flow-driven micro-scale pH variability affects the physiology of corals and coralline algae under ocean acidification

Abstract.

"Natural variability in pH in the diffusive boundary layer (DBL), the discrete layer of seawater between bulk seawater and the outer surface of organisms, could be an important factor determining the response of corals and coralline algae to ocean acidification (OA). Here, two corals with different morphologies and one coralline alga were maintained under two different regimes of flow velocities, pH, and light intensities in a 12 flumes experimental system for a period of 27 weeks. [...]"

Source: Scientific Reports
Authors: S. Comeau et al.
DOI: 10.1038/s41598-019-49044-w

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Combined effects of ocean acidification and temperature on larval and juvenile growth, development and swimming performance of European sea bass

Abstract.

"Ocean acidification and ocean warming (OAW) are simultaneously occurring and could pose ecological challenges to marine life, particularly early life stages of fish that, although they are internal calcifiers, may have poorly developed acid-base regulation. This study assessed the effect of projected OAW on key fitness traits (growth, development and swimming ability) in European sea bass (Dicentrarchus labrax) larvae and juveniles. [...]"

Source: PLoS One
Authors: Louise Cominassi etal.
DOI: 10.1371/journal.pone.0221283

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Ferry in Alaska monitors ocean acidification

"The last two years MV Columbia records the ocean’s vitals every three minutes, along a 1,600-kilometer route through the Inside Passage. This includes the coastal region from Puget Sound to the Alaska Panhandle. The ship measures the sea's temperature, salinity, dissolved oxygen content, and carbon dioxide concentration, aiming to monitor ocean acidification. [...]"

Source: Safety4Sea

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High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site

Abstract.

"Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and discrete sampling govern the distribution of dissolved CH4 in oceans and lakes. [...]"

Source: Ocean Science
Authors: Pär Jansson et al. 
DOI: 10.5194/os-15-1055-2019

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Climate change could shrink oyster habitat in California

"Ocean acidification is bad news for shellfish, as it makes it harder for them to form their calcium-based shells. But climate change could also have multiple other impacts that make California bays less hospitable to shelled organisms like oysters, which are a key part of the food web.

Changes to water temperature and chemistry resulting from human-caused climate change could shrink the prime habitat and farming locations for oysters in California bays, according to a new study from the University of California, Davis. [...]"

Source: Science Daily

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Building the Knowledge-to-Action Pipeline in North America: Connecting Ocean Acidification Research and Actionable Decision Support

Abstract.

"Ocean acidification (OA) describes the progressive decrease in the pH of seawater and other cascading chemical changes resulting from oceanic uptake of atmospheric carbon. These changes can have important implications for marine ecosystems, creating risk for commercial industries, subsistence communities, cultural practices, and recreation. [...]"

Source: Frontiers in Marine Science
Authors: Jessica N. Cross et al.
DOI: 10.3389/fmars.2019.00356

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Effects of ocean acidification on the respiration and feeding of juvenile red and blue king crabs (Paralithodes camtschaticus and P. platypus)

Abstract.

"Ocean acidification is a decrease in pH resulting from dissolution of anthropogenic CO2 in the oceans that has physiological effects on many marine organisms. Juvenile red and blue king crabs (Paralithodes camtschaticus and P. platypus) exhibit both increased mortality and decreased growth in acidified waters. In this study, we determined how ocean acidification affects oxygen consumption, feeding rates, and growth in both species. [...]"

Source: ICES Journal of Marine Science
Authors: William Christopher Long et al.
DOI: 10.1093/icesjms/fsz090

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Carbon cycling in the North American coastal ocean: a synthesis

Abstract.

"A quantification of carbon fluxes in the coastal ocean and across its boundaries with the atmosphere, land, and the open ocean is important for assessing the current state and projecting future trends in ocean carbon uptake and coastal ocean acidification, but this is currently a missing component of global carbon budgeting. This synthesis reviews recent progress in characterizing these carbon fluxes for the North American coastal ocean. [...]"

Source: Biogeosciences
Authors: Katja Fennel et al.
DOI: 10.5194/bg-16-1281-2019

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