Sentences with phrase «marine food webs»

Since phytoplankton form the base of marine food webs, the world's most productive fisheries are located in areas of coastal upwelling that bring cold nutrient rich waters to the surface (especially in the eastern boundary regions of the subtropical gyres); about half the world's total fish catch comes from upwelling zones.

At the same time, acidification will hurt species with calcium carbonate shells, including the plankton which form the entire basis for marine food webs.

In addition to altering marine food webs, iron fertilization could produce greenhouse gases more potent than carbon dioxide, such as nitrous oxide and methane, or block sunlight needed by deep coral reefs.

«Earth system models» include all that and much more: forests that can shrink or spread as conditions change; marine food webs that react as the oceans grow more acidic with carbon dioxide; and aerosol particles in the atmosphere that interact with greenhouse gases, enhancing or sapping their warming power.

Identification of abundant groups in bacterial communities is important in assessing roles in carbon cycling and ocean biogeochemical processes, and as a component of some marine food webs.

As warming starts to shake up marine food webs, ecologists say it may give an unexpected boost to some fisheries — but also make them more precarious.

Scientists are concerned that ocean acidification — a gradual acidification of seawater — could have negative consequences for marine organisms, marine food webs, and entire ecosystems.

It provides oxygen, supports marine food webs, and influences global biogeochemical cycles.

This «kelp highway hypothesis» suggested that highly productive kelp forests supported rich and diverse marine food webs in nearshore waters, including many types of fish, shellfish, birds, marine mammals, and seaweeds that were similar from Japan to California, Erlandson and his colleagues also argued that coastal kelp forests reduced wave energy and provided a linear dispersal corridor entirely at sea level, with few obstacles to maritime peoples.

Plus this toxic soup disturbs marine food webs and ecosystems.

About BIOACID: Since 2009, more than 250 BIOACID scientists from 20 German research institutes have investigated how different marine organisms respond to ocean acidification and increasing carbon dioxide concentrations in seawater, how their performance is affected during their various life stages, how these reactions impact marine food webs and elemental cycles and whether they can be mitigated by evolutionary adaptation.

Also of concern is that a large class of plankton, floating in the open oceans and forming a vital component of marine food webs, appears equally vulnerable to acidification.

Oceanic uptake of anthropogenic carbon dioxide (CO2) causes pronounced shifts in marine carbonate chemistry and a decrease in seawater pH. Increasing evidence indicates that these changes — summarized by the term ocean acidification (OA)-- can significantly affect marine food webs and biogeochemical cycles.

Fate, kinetics and metabolism of phycotoxins of human health concern in marine food webs.

Applications are invited to the following two postdoctoral positions based at the University of British Columbia within the Marine Food Webs Working Group of the Hakai Coastal Initiative.

But in the world of marine microbial ecology, there are very few model systems and associated tools that enable scientists to deeply explore the physiology, biochemistry, and ecology of marine microbes, which drive the ocean's elemental cycles, influence greenhouse gas levels, and support marine food webs.

Unicellular photosynthetic microbes — phytoplankton — are responsible for virtually all oceanic primary production, which fuels marine food webs and plays a fundamental role in the global carbon cycle.

«This can help us determine mechanisms that influence species composition in planktonic communities exposed to red tides, and suggests that these chemical cues could alter large - scale ecosystem phenomena, such as the funneling of material and energy through marine food webs.»

That's the conclusion of a new study, which finds that rebounding populations of baleen and sperm whales may be boosting marine food webs around the world.

But that doesn't mean that the consequences don't exist, from changes in marine food webs to shifts in oceanic and atmospheric chemical composition.

Global warming is increasing ocean temperatures and harming marine food webs.

Determining how such departures and arrivals influence complicated marine food webs will be difficult work, she says, involving laborious field surveys and careful counts of jellyfish stomach contents.

The researchers looked specifically at the average fishing revenue in 106 Alaskan communities for 10 years before and after 1989, a year when the North Pacific Ocean experienced a significant shift in productivity and abrupt changes in the composition of marine food webs, while at the same time the global price for salmon dropped because of competition from farm - raised fish.

«So the contamination of long - lived radionuclides in different organisms in the local marine food webs needs to be monitored continually.»

Haddock thinks the importance of jellyfish in marine food webs has been unappreciated and underestimated.

As the oceans become more acidic thanks to greenhouse gas emissions, box jellyfish will eat far more copepods — the foundations of marine food webs

Scientists in B.C. and the U.S. have several questions they are pursuing - the pyrosome's feeding behavior, the environmental variables the affect their numbers and the impact on the marine food web.

Their return tells a bigger environmental success story: federal and state regulations stretching back 40 years have curtailed pollution and repaired the marine food web that includes white sharks (formerly called great white sharks).

The goal is a better appreciation of the huge role that jellies play in the marine food web, as well as a more complete inventory of how carbon (fundamental to both life and climate) is distributed in the ocean.

The polar bear is a semi-aquatic marine mammal that depends mainly upon the pack ice and the marine food web for survival.

Researchers find trouble among phytoplankton, the base of the food chain, which has implications for the marine food web and the world's carbon cycle

Thus, past and future increases in atmospheric nitrogen deposition have the potential to alter the base of the marine food web; and, in the long term, the structure of the ecosystem.

Plankton species, the foundation of the marine food web, have shifted back slightly toward fat - rich, cool - water species that improve the growth and survival of salmon and other fish.

The shells of marine snails known as pteropods, an important link in the marine food web, are already dissolving.

«While the changing seascape has dramatically altered and increased the diversity and number of small creatures at the base of the marine food web, we still don't know how these changes in the ecosystem will propagate through the entire chain.

Phytoplankton and bacteria form the base of the marine food web.

The marine food web is not just defined by the immediate «eat and be eaten» — the exchange of organic nutrients and vital functions is equally crucial.

Pauly has documented a persistent pattern of fishing down the marine food web: after prized top predators are hunted out, fishermen turn to increasingly smaller prey, depleting coastlines of marine life.

The newly revealed information about the growth of phytoplankton in polynyas could provide scientists with improved insights into how the marine food web in the Antarctic works and how this could be impacted by climate change.

Such debris doesn't really dissolve, but persists for many years, breaking down into micro-particles that further absorb toxic pollutants and enter the marine food web with unknown consequences for marine life.

Phytoplankton, which live close enough to the water's surface to perform photosynthesis — critical to maintaining oxygen in Earth's atmosphere — form the base of the marine food web.4 Although phytoplankton are microscopic, they can be seen from satellites when they grow in a concentrated area (bloom) on the ocean's surface.5 Zooplankton, which feed on phytoplankton, and bacterioplankton, which recycle nutrients in the water, make up the next levels of the web.4

Phytoplankton are the dominant plants in the sea, and are the basis of the entire marine food web.

Scientists across NOAA Fisheries are watching a persistent expanse of exceptionally warm water spanning the Gulf of Alaska that could send reverberations through the marine food web.

24: Oceans).135 Acidifying changes in ocean chemistry have potentially widespread impacts on the marine food web, including commercially important species.

These organisms form a crucial component of the marine food web that sustains life in the rich waters off Alaska's coasts.

With climate change, these waters will warm and acidify, potentially altering the marine food web.

At 3.5 C above baseline, we'll lose all or nearly all the phytoplankton, the base of the marine food web.

Despite low biomass, phytoplankton carries out almost half of global primary production, and is the basis of the marine food web (Field et al., 1998).

Not exact matches

THE food webs of ocean species are so varied that predicting the effect of climate change on marine ecology has seemed nigh - on impossible.

Now, the robot's first findings are already helping scientists piece together more of this previously hidden under - ice food web, including more evidence of the under - ice algae, as well as tiny copepods, ctenophores (jellyfish), predatory marine worms called arrow worms, and abundant amounts of large floating slime balls, known to scientists as larvaceans.