Sentences with phrase «more diatoms»

That creates more acidification, which kills off more diatoms?

Not exact matches

In a presentation at a recent ocean acidification conference, Tatters reported that the more CO2 and the less silicate, the higher the diatom's toxin production — more than doubling at the level of dissolved CO2 scientists expect the oceans to reach by 2100.

Then in 1997 and 1998, they and their colleagues sampled copepods in the Adriatic Sea during diatom blooms in winter, when the copepods feast primarily on diatoms, and during the summer, when diatom numbers are down and copepods eat a more mixed diet that includes other algae.

According to Ingall, removal of iron by diatom - dominated phytoplankton communities may dampen the intended outcome of enhanced carbon uptake through iron fertilization by reducing the productivity of other phytoplankton, which take up carbon dioxide more efficiently.

Georgia Tech research published online Monday in Nature Communications indicates that diatoms stuff more iron into their silica shells than they actually need.

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

If there is plenty of silicate, marine organisms called diatoms will grow more happily.

If there is very little silicate available, organisms called coccolithophores grow more readily than diatoms.

As discussed in Natural Cycles of Ocean Acidification, diatoms are large, produce siliceous shells, and more rapidly shuttle CO2 from the surface to ocean depths.

Between AD 500 and 700 and the Little Ice Age phase 2 (LIA 2 — AD 1630 — 1850), the frequent typhoons were inferred by coarse sediments and planktonic diatoms, which represented more dynamical climate conditions than in the LIA 1.

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.

As evolving diatom populations expanded, a more efficient biological pump buried more CO2 at depth that is now detected as siliceous ooze or as biogenic opal deposits.

report that ocean sediment cores containing an «undisturbed history of the past» have been analyzed for variations in PP over timescales that include the Little Ice Age... they determined that during the LIA the ocean off Peru had «low PP, diatoms and fish,» but that «at the end of the LIA, this condition changed abruptly to the low subsurface oxygen, eutrophic upwelling ecosystem that today produces more fish than any region of the world's oceans... write that «in coastal environments, PP, diatoms and fish and their associated predators are predicted to decrease and the microbial food web to increase under global warming scenarios,» citing Ito et al..

More locally, Moros et al. (2006) record substantial environmental changes in Disko Bugt sediments at w4 ka based on diatoms and sediment physical proxies.

Although this upwelling deceases surface pH and provides more CO2, diatoms still rely on bicarbonate transporters and carbonic anhydrase to ensure an adequate supply of CO2 for photosynthesis.