Sentences with phrase «used diatoms»

Updated, 10:41 p.m. At the asterisk above, I originally used diatoms as a synonym for coccolithophores.

As part of the study, Bloom, now an assistant professor at Illinois State University, developed a mathematical model to reconstruct drought over thousands of years using diatoms.

His position: • No evidence of increasing lake clarity as a result of secchi measurements since 1946 • The interplay of stratification and plankton productivity are not «straightforward» • Challenges O'Reilly's assumption on the correlation of wind and productivity - the highest production is on the end of the lake with the lowest winds • A strong caution using diatoms as the productivity proxy (it is one of two different lake modes) • No ability to link climate change to productivity changes • More productivity from river than allowed for in Nature Geopscience article • Externally derived nutrients control productivity for a quarter of the year • Strong indications of overfishing • No evidence of a climate and fishery production link • The current productivity of the lake is within the expected range • Doesn't challenge recent temp increase but cites temperature records do not show a temperature rise in the last century • Phytoplankton chlorophylla seems to have not materially changed from the 1970s to 1990s • Disputes O'Reilly's and Verbug's claims of increased warming and decreased productivity • Rejects Verburgs contention that changes in phytoplankton biomass (biovolume), in dissolved silica and in transparency support the idea of declining productivity.

Not exact matches

As an IIE - SRF fellow at the University of Gothenburg, Al - Handal is again able to use his expertise in taxonomy of marine diatoms, a type of microalgae, with the added advantage of direct access to a scanning electron microscope, which he didn't have in Iraq.

The aim of my PhD is to use the distribution of diatom species preserved in sediment cores across the Scotia Sea to reconstruct the position of major ocean boundaries and water masses through time.

The quality of our rivers is determined using the Swiss diatom index (DI - CH), whose value defines the ecological status.

One key to the whole experiment's success turns out to be the specific diatoms involved, which use silicon to make their shells and tend to form long strands of cellular slime after their demise that falls quickly to the seafloor.

Scientific analysis of diatom oil has shown that it is very suitable for use as biofuel, says T. V. Ramachandra, a professor of ecological sciences at the Indian Institute of Science (IISc) here who is working on this project with IISc researchers Durga Mahapatra and Karthick Balasubramanian, along with Richard Gordon, a radiology professor at the University of Manitoba in Winnepeg.

«It appears the diatoms aren't using all of the iron for photosynthesis,» he said.

Investigation has shown that diatom oil can be used as biofuel without further processing, says Ramachandra — another advantage.

Pico - and Nanophytoplankton grow more strongly under these conditions — consuming nutrients that larger photosynthesizing plankton such as about diatoms would have used.

(Though, since that first episode covered primarily the oxygen cycle, diatoms and algae blooms were just mentioned as the source of half of the oxygen we breathe, as opposed to rainforests, which are important for the rain cycle that gets nutrients from the mountains into the oceans but which are using up all the oxygen they produce.

A Yale team has looked to nature to help solve a design problem, using tiny fossilized creatures called diatoms to improve the light absorption of organic solar cells.

Shortly after that meeting, Crutzen learned that Eugene F. Stoermer, an admired analyst of tiny lakebed diatom fossils, had used the word in the 1980s.

We incubated a natural diatom community from coastal New Zealand waters in a short - term incubation experiment using a factorial matrix of temperature and CO2, and measured effects on community structure.

Our results support the use of short - term manipulative experiments spanning weeks as proxies to understand the potential effects of global change forcing on diatom community structure over longer timescales such as years.

We assess atmospheric versus oceanic influences on glacial discharge at this location, using analyses of diatom geochemistry to reconstruct atmospherically forced glacial ice discharge and diatom assemblage ecology to investigate the oceanic environment.

In the linked comment, and its links, there's a discussion of the balance between diatoms, which incorporate silica (tes) in their shells, and coccolithophores, which use calcium carbonate.

Multi-centennial-scale changes in East Asian typhoon frequency during the mid-Holocene This study reconstructs a record of typhoon frequency over the Korean Peninsula during the mid-Holocene using mineral components and diatom assemblages in deposits of Lagoon Hyangho, located on the east coast of the peninsula.

Fig. 2: Cryophilic Fragilariopsis such as F. obliquecotate are used in the diatom transfer functions used to reconstruct sea ice.

(Though, since that first episode covered primarily the oxygen cycle, diatoms and algae blooms were just mentioned as the source of half of the oxygen we breathe, as opposed to rainforests, which are important for the rain cycle that gets nutrients from the mountains into the oceans but which are using up all the oxygen they produce.

Once the silicate in the water is used up, the population of diatoms will drop and you will no longer have the same distribution of phytoplankton species.

Foraminifera, also known as forams, and diatoms are commonly used climate proxies.

Researchers may also use foram and diatom population dynamics to infer past climate.

Inter-specific competition was found to be similar in both the unconditioned natural and the conditioned artificial community, suggesting that for diatom communities, short - term manipulative experiments may be used to predict the effects of long - term environmental forcing on community structure.