Sentences with phrase «when diatoms»

The lake remained nearly barren until around 1960, when the diatoms began to return.

When diatoms bloom, they can impede copepod reproduction and may even disrupt the marine food chain, the study suggests.

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.

Not exact matches

Scherer would later find dozens of crushed diatom shells in his samples — possible remnants of microscopic aquatic organisms from when the site of Lake Whillans was a shallow seafloor.

When the weather warms and no ice sits upon the seas, the sediment on the ocean floor is mainly organic: remains of plankton and diatoms.

He spotted the glassy shards of ancient diatom shells — the remains of microscopic phytoplankton that lived here at warmer times in the past, when a shallow sea covered much of West Antarctica.

A new study shows that at least two diatom species make compounds that reduce hatching rates when eaten by tiny shrimplike animals called copepods.

High - speed video revealed that the fish feed quite differently than other gobies when they scrape diatoms from the rocks, extending their top jaw way out and not pulling the lower jaw back as much as other species do.

When they examined the water column for silica - the compound that makes up the hard supporting structure of diatoms — they didn't find much.

New diatom species Diatoms may have other advantages when it comes to oil production.

Diatoms would float about in a nutrient - rich water solution and produce oil when exposed to sunlight.

The first took place from June to August 2011, when large numbers of diatoms (a type of microscopic alga) bloomed near the surface, then sank rapidly to the seafloor.

When a flea, ant, spider, etc. comes into contact with the remaining sharp edges of the diatoms, they lacerate the waxy exoskeleton of the bug and the powder absorbs the body fluids causing death by dehydration.

Phaeocystis antarctica, a non-siliceous prymnesiophyte, dominates some Southern Ocean phytoplankton communities, but loses out to diatoms when bioavailable iron is low.

At any rate, when «normal» rain containing natural carbonic acid falls upon silicon - containing sedimentary rocks formed over eons from the shells of tiny marine creatures — radiolarians, diatoms and some sponges — this «siliceous» rock combines with the carbonic acid to form ions of bicarbonate.

Declining Arctic sea ice reached a milestone in the summer of 1998 when the ice pulled back completely from the Arctic coasts of Alaska and Canada, opening up the Northwest passage through which the diatom may have passed, Reid and colleagues write in their report of the diatom's return published in the journal Global Change Biology in 2007.

Noteworthy is the significantly lower variance (p = 0.02) in the diatom index during the MCA when compared to that of the LIA.

That said, the continuous diatom record from El Junco in the Galápagos Islands similarly shows enhanced ENSO variability during the LIA when compared to the past millennium (not shown).

When hard - shelled algae called diatoms fossilize, they create a sedimentary rock that is easy to crumble called diatomaceous earth.