Sentences with phrase «calcareous rhizolith»

But because it is a calcareous stone, marble is softer and more porous than granite.

Ability to clean calcareous deposits and stains from teeth and gum margins.

PROFILE: Energetic professional with hands - on experience in cleaning accretions and calcareous deposits from teeth and under gum margins.

Finally, post-depositional diagenesis of calcareous bedding may enhance and / or distort orbital - scale variations.

These and other ecosystems where calcareous organisms (e.g., pteropods, see Glossary) play an important role will become vulnerable this century (reviewed by Raven et al., 2005; Haugan et al., 2006; Table 4.1).

Ocean acidification is often considered in terms of its direct negative effects on the growth and calcification of organisms with calcareous shells or skeletons.

These responses include impacts on calcification rates [18,19], immune function [20], reproduction and carryover effects in larval and juvenile stages of invertebrates [21], enhanced productivity in phytobenthos [22 — 25] but reduced calcification and growth in calcareous algae [26 — 28].

Much of his recent research efforts are focused on using boron isotopes in the calcareous shells of foraminifera to reconstruct the state of the oceanic carbonate system in the geological past.

Perhaps there are mechanisms as well for bringing the calcareous ooze back to the surface.

«Calcareous ooze is ooze that is composed of at least 30 % of the calcareous microscopic shells — also known as tests — of foraminifera, coccolithophores, and pteropods.

Freshman geology teaches students that CO2 solubility in water to create carbonic acid, a major process in dissolution of calcareous material, is strongly tied to temperature.

During the early Miocene, calcareous biogenic sediments began to be displaced northward by siliceous biogenic sediments with higher rates of sedimentation reflecting the beginning of circulation related to the development of the Antarctic Convergence.

With very inaccurate estimates, how can you be certain that some of the light atmospheric C is not coming from termites, reduced calcareous phytoplankton pull down, increased imbalance between sea and air caused by reduced mixing?

The main carbon sink is ocean calcareous phytoplankton like coccolithophores, and diatoms.

Without knowing if, for example, industrialised agriculture has tipped the oceans from calcareous phyto production to silicaceous diatoms, and thus reduced light C pulldown, I can not understand how we can assign the increase just to what is coming out of our chimneys.

That additional acidity gained from carbon dioxide in sea water is affecting many species with calcareous shells and having the most significant effect on hard corals, which also use calcium carbonate to build their home

The marine biota also redistribute carbon: marine organisms grow organic tissue and calcareous shells in surface waters, which, after their death, sink to deeper waters, where they are returned to the dissolved inorganic carbon reservoir by dissolution and microbial decomposition.

On the other hand, some shelled organisms, including oysters, clams, sea urchins, corals, and calcareous plankton could be at risk if a more acid environment interferes with the calcification process.

This is the first study to document the response of calcareous phytoplankton to surface water warming occurring in SBB since 1970.»

«Calcareous phytoplankton response to the half century of interannual climatic variability in Santa Barbara Basin (California)-- Bianca De Bernardi, 1 Patrizia Ziveri, 2,3 Elisabetta Erba, 1 and Robert C. Thunell4

We have investigated the response of a coral reef community dominated by scleractinian corals, but also including other calcifying organisms such as calcareous algae, crustaceans, gastropods and echinoderms, and kept in an open - top mesocosm.

We have investigated the response of a coral reef community dominated by scleractinian corals, but also including other calcifying organisms such as calcareous algae, crustaceans, gastropods and echinoderms, and kept in an open - top mesocosm [note: a «mesocosm» is an aquarium].

«Acidification actually threatens all marine animals and plants with calcareous skeletons, including corals, snails, clams and crabs.

The latter is also supported by the presence of calcareous algae (coccolithophoridae) in the Eemian sediments of Core PS2200 - 5 (Supplementary Fig. 2) 56.

Along gradients of normal pH (8.1 — 8.2) to lowered pH (mean 7.8 — 7.9, minimum 7.4 — 7.5), typical rocky shore communities with abundant calcareous organisms shifted to communities lacking scleractinian corals with significant reductions in sea urchin and coralline algal abundance.

The closest they come to saying this is «in four of the 18 species (limpets, purple urchins, coralline red algae, calcareous green algae), net calcification increased relative to the control under intermediate CO2 levels (605 and 903 ppm), and then declined at the highest CO2 level (2856 ppm)».

Calcareous nannofossils from approximately the past 7000 yr of the Holocene and from oxygen isotope stage 5 are present at 39 analyzed sites in the central Arctic Ocean.

We show that the onset of the PETM coincided with a prominent increase in the origination and extinction of calcareous phytoplankton.

[29] Interestingly, no change in the distribution of calcareous nanoplankton such as the coccolithophores can be attributed to acidification during the PETM.

The first data series — from calcareous shells of marine organisms that live 50 to 200 metres below the sea surface in the northern Atlantic — shows the temperature conditions there.

Not just corals, but benthic foraminifera and calcareous algae may be affected.

I think some research shows corals expelling their symbiotic algae at higher temperatures, which will make growing more difficult, leading to greater difficulties in keeping the productive population at the proper depth, and they've got decreased ability to build their calcareous skeletons (due to the dissolving CO2) on top of all that.

The area boasts hotels, a casino, great nightlife and many restaurants, but it is also steeped in legend and home to a beautiful calcareous island.

Main visitor attraction of the park is the calcareous formations of the limestone caverns.

These are called the Toledo Beds and consist mainly of thin bedded shales and mudstones, with some blue calcareous (calcium derived) sandstones and patches of limestone.

Modern sediments around the site include sandy - muds in inland lagoons (composed mainly of peneroplid foraminifera) and on the windward side, a 3.3 yard raised beach 44 - 98 yards wide, of calcareous sand.

Goniolithion species: A red algae that has a calcareous internal skeleton and looks like a small, fragile branching coral.

Most soil is limestone in origin, generally shallow and stony, though there are areas of slightly deeper and more fertile calcareous soil.

Ragged Point Inn has a wine bar on site that serves local Paso Robles and Edna Valley favorites like Eberle, Calcareous, Baileyana and J. Lohr.

Pink Beach — locally called Pantai Merah — has a mixture of white and red sand formed from pieces of foraminifera, a marine protozoan with calcareous shells, and is one of only seven of its kind in the entire world.

As the calcareous shells of crustaceans that lived in the sea were discarded, they built up on the floor, and eventually became calcium carbonate — limestone.

Raised CO2 in aquatic systems can also lead to physiological stress, difficulty in building calcareous shells etc. (as will happen if atmospheric CO2 continues to build up beyond around 700ppm - the so called ocean acidification effect).

Geodes in sedimentary rocks are usually found in limestones, dolomites, and calcareous shale.

The testis occur as white regions along the body of the animal which is here removed from its calcareous shelter (middle image).

They collect corals of sediments, they take samples of the various calcareous organisms in them and do measurements for instance of the isotopic composition of the shells.

One of the most likely consequences is the slower growth of organisms forming calcareous skeletons or shells, such as corals and mollusks.

The team said the eggshells were pliable with hard calcareous exteriors and soft inner membranes, similar to the eggs of some snakes.

coccoliths: Microscopic structures of varying shape and size that are made of calcite, are secreted by calcareous nannoplankton, and are found in marine deposits from the Triassic period to the Recent.

Pre-bomb radiocarbon and the reservoir orrection for calcareous marine species in the Southern Ocean.

An exceptionally porous form of travertine is known as calcareous tufa.