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Tag: "phytoplankton" at biology news

Growth in the sea comes down to a struggle for iron

..., oceanographers puzzled over the low abundance of phytoplankton in some ocean waters that seemed to hold all the b...reas have a persistent excess of nutrients because phytoplankton growth is reduced." Many scientists from around the world are now studying iron effects in these re...

NASA study finds snow melt causes large ocean plant blooms

...used satellite observations of ocean color to show phytoplankton concentrations in the Western Arabian Sea have inc...nutrient-rich water, creating ideal conditions for phytoplankton to bloom every year during summer. Since 1997, a reduction in snow has led to wider temperature dif...

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...jor source of food for larger organisms. But some phytoplankton species produce harmful blooms, known as red or br...e nitrogen is low relative to other nutrients that phytoplankton need to grow, and the Gulf of California is one of those regions. Our study is the first to show tha...

Currents could disrupt ocean food chain

... In a worst case scenario, global productivity of phytoplankton could decrease by as much as 20 percent and in som...ing of waters constantly replenishes the supply of phytoplankton at the surface, forming a rich nutrient source at the bottom of the marine food web. There is growi...

Oceans turning to acid from rise in CO2

...atively impact other calcifying organisms, such as phytoplankton and zooplankton, some of the most important players at the base of the planet's food chain. "We can predict the magnitude of the acidification based on the evidence that has been collected from the ocean's surface, the geological and historical reco...

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

...ese nutrients trigger the growth of huge algae and phytoplankton blooms. As these blooms die, they sink to the ocean floor where they are decomposed by bacteria and other microorganisms. Decomposition depletes most of the oxygen in the surrounding water, making it difficult for marine life to survive. Although s...

The diversity of marine life in the Gulf of Maine region is much greater than previously thought

... teaspoon of seawater can hold more than a million phytoplankton (tiny plants that float with currents). Phytoplankton also are the species that give otherwise blue oceans (reflecting the color of the sky) their varying colors. Two of the microscopic plant species are of the genus Alexandrium and are the source...

'Dead zone' summer killed billions of ocean state mussels

... so many mussels, which filter minute algae called phytoplankton from the water, might affect the bay's ecosystem. So Altieri calculated the filtering capacity of mussels in the reefs, before and after the hypoxic event. They found that the healthy mussels could filter the equivalent of the entire volume of Narra...

NASA study solves ocean plant mystery

... respond to climate change. The study focused on phytoplankton in the tropical Pacific Ocean. It is an area of th...sity, Corvallis, Ore. Scientists determined when phytoplankton is stressed from lack of iron; it appears greener, or healthier than they really are. Normally, gree...

Iron critical to ocean productivity, carbon uptake

...ific Ocean lack sufficient iron to trigger healthy phytoplankton growth and the absence of the mineral stresses the... journal Nature. When stressed by a lack of iron, phytoplankton create additional pigments that fluoresce, or light up, unlike normal pigments, according to lead au...

Marine 'dead zone' off Oregon is spreading

...th oxygen-rich water near the surface, causes some phytoplankton growth and provides the basis for a thriving fishery and healthy marine food chain. During dead zone periods, some of the normal processes ?including wind and current conditions ?can change. This allows huge masses of plant growth to die, decay and i...

Sandia research to focus on early detection of harmful algal blooms

...e to simultaneously analyze multiple HAB toxins in phytoplankton and/or shellfish in the field. Lane and his colleagues will aim to optimize the micro-separations process for a sub-set of relevant toxins, and establish the laboratory-based protocols for sample preparation. The long-term goal, should the initial ...

Climate experts search for answers in the oceans

...rimary production. While individually microscopic, phytoplankton chlorophyll collectively tints the surrounding oce... with dedicated ocean colour sensors. "Because phytoplankton are a major influence on the amount of carbon in the atmosphere and are sensitive to environmental c...

Researchers link ocean organisms with increased cloud cover and potential climate change

...t mechanism by which chemical emissions from ocean phytoplankton may influence the formation of clouds that reflect... area of the Southern Ocean where a large bloom of phytoplankton was occurring. Based on satellite data, the researchers hypothesized that airborne particles produc...

MIT's ocean model precisely mimics microbes' life cycles

...paper and creator of the model. "The fact that the phytoplankton that emerge in our model are analogous to the real phytoplankton gives us confidence in the value of our approach." One of Follows' collaborators, Penny Chisholm,...

Satellites shed light on global warming

...therefore they are believed to have some effect on phytoplankton ?the tiny chlorophyll-pigmented algal cells that populate the oceans in huge numbers and play a leading role in the global carbon cycle and the primary production of nutrients. Current research is investigating these relationships by exploiting t...

Scientists uncover link between ocean's chemical processes and microscopic floating plants

... "greenhouse gases." "Pronounced changes in some phytoplankton have been observed during previous experiments," s...l sulfide (DMS) and chloroiodomethane, produced by phytoplankton in ocean water, were measured. "In the atmosphere, DMS is rapidly oxidized to sulfur dioxide, whic...

MIT's ocean model captures diversity of underwater forests

...paper and creator of the model. "The fact that the phytoplankton that emerge in our model are analogous to the real phytoplankton gives us confidence in the value of our approach." One of Follows' collaborators, Penny Chisholm,...

Puzzling plankton yield secrets to role in evolution/global photosynthesis

...tional Academy of Sciences (PNAS). Ocean-dwelling phytoplankton from the genus Ostreococcus emerge at the primitiv...ts." "Assimilation of atmospheric CO2 by marine phytoplankton is a global-scale process that is responsible for about half of the biosphere net primary production...

Antarctic icebergs -- Hotspots of ocean life

...preferred food for krill, we expect the changes in phytoplankton community composition to favor grazing as a key biological process involved in carbon sequestration around free-floating icebergs,” said oceanographer Maria Vernet from Scripps Institution of Oceanography at UC San Diego, one of the members of the re...

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