Saturation-state sensitivity of marine bivalve larvae to ocean acidification

  • Posted on: Wed, 03/30/2016 - 15:50
  • By: petert

Ocean acidification results in co-varying inorganic carbon system variables. Of these, an explicit focus on pH and organismal acid–base regulation has failed to distinguish the mechanism of failure in highly sensitive bivalve larvae. With unique chemical manipulations of seawater we show definitively that larval shell development and growth are dependent ...

Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic

  • Posted on: Wed, 03/30/2016 - 15:41
  • By: petert

The seasonal variability of inorganic carbon in the surface waters of the Scotian Shelf region of the Canadian northwestern Atlantic Ocean was investigated. Seasonal variability was assessed using hourly measurements, covering a full annual cycle, of the partial pressure of CO2, (pCO2), and hydrographic variables obtained by an autonomous moored ...

Episodic riverine influence on surface DIC in the coastal Gulf of Maine

  • Posted on: Wed, 03/30/2016 - 15:39
  • By: petert

Anomalously high precipitation and river discharge during the spring of 2005 caused considerable freshening and depletion of dissolved inorganic carbon (DIC) in surface waters along the coastal Gulf of Maine. Surface pCO2 and total alkalinity (TA) were monitored by repeated underway sampling of a cross-shelf transect in the western Gulf of ...

The swimming kinematics of larval Atlantic cod, Gadus morhua L., are resilient to elevated seawater pCO2

  • Posted on: Wed, 03/30/2016 - 15:29
  • By: petert

Kinematics of swimming behavior of larval Atlantic cod, aged 12 and 27 days post-hatch (dph) and cultured under three pCO2 conditions (control-370, medium-1800, and high-4200 μatm) from March to May 2010, were extracted from swim path recordings obtained using silhouette video photography. The swim paths were analyzed for swim duration, distance and speed, ...

Egg and early larval stages of Baltic cod, Gadus morhua, are robust to high levels of ocean acidification

  • Posted on: Wed, 03/30/2016 - 15:23
  • By: petert

The accumulation of carbon dioxide in the atmosphere will lower the pH in ocean waters, a process termed ocean acidification (OA). Despite its potentially detrimental effects on calcifying organisms, experimental studies on the possible impacts on fish remain scarce. While adults will most likely remain relatively unaffected by changes in ...

Severe tissue damage in Atlantic cod larvae under increasing ocean acidification

  • Posted on: Wed, 03/30/2016 - 15:21
  • By: petert

Ocean acidification, caused by increasing atmospheric concentrations of CO2, is one of the most critical anthropogenicthreats to marine life. Changes in seawater carbonate chemistry have the potential to disturb calcification, acid–base regulation, blood circulation and respiration, as well as the nervous system of marine organisms, leading to long-term effects such ...

Vulnerability and adaptation of US shellfisheries to ocean acidification

  • Posted on: Wed, 03/30/2016 - 15:16
  • By: petert

Ocean acidification is a global, long-term problem whose ultimate solution requires carbon dioxide reduction at a scope and scale that will take decades to accomplish successfully. Until that is achieved, feasible and locally relevant adaptation and mitigation measures are needed. To help to prioritize societal responses to ocean acidification, we ...

Long-term and trans-life-cycle impacts of exposure to ocean acidification in the green sea urchin Strongylocentrotus droebachiensis

  • Posted on: Wed, 03/30/2016 - 15:13
  • By: petert

Anthropogenic CO2 emissions are acidifying the world’s oceans. A growing body of evidence demonstrates that ocean acidification can impact survival, growth, development and physiology of marine invertebrates. Here, we tested the impact of long-term (up to 16 months) and trans-life-cycle (adult, embryo/larvae and juvenile) exposure to elevated pCO2 (1,200 μatm, compared to control 400 μatm) on ...

Impact of CO2-induced seawater acidification on the burrowing activity of Nereis virens and sediment nutrient flux

  • Posted on: Wed, 03/30/2016 - 14:25
  • By: petert

A mesocosm experiment was conducted to quantify the effects of medium term (5 wk) exposure to acidified seawater on the structure of Nereis virens (Polychaeta) burrows and sediment nutrient fluxes. Worms were exposed to seawater acidified to a pH of 7.3, 6.5 or 5.6 using carbon dioxide (CO2) gas. These treatments mimicked ...

Elevated pCO2 exposure during fertilization of the bay scallop Argopecten irradians reduces larval survival but not subsequent shell size

  • Posted on: Wed, 03/30/2016 - 14:03
  • By: petert

Ocean acidification, characterized by elevated partial pressure of CO2 (pCO2), generally has negative effects on early life stages of invertebrates. We tested the idea that fertilization is a critical CO2 exposure stage for the bay scallopArgopecten irradians by determining the effects on bay scallops of exposure to high CO2 (pCO2 ~2600 ppm, pH ~7.30) from ...

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