Sentences with phrase «planktonic unicells»

Changes to planktonic and benthic community composition and productivity have been observed in the North Sea since 1955 (Clark and Frid, 2001) and since the mid-1980s may have reduced the survival of young cod (Beaugrand et al., 2003).

This may impact a wide range of organisms and ecosystems (e.g., coral reefs, Box 4.4, reviewed by Raven et al., 2005), including juvenile planktonic, as well as adult, forms of benthic calcifying organisms (e.g., echinoderms, gastropods and shellfish), and will affect their recruitment (reviewed by Turley et al., 2006).

This will require long - term rearing in multi-stressor conditions, from fertilization through planktonic development to maturation into adults, which are then used to generate F1 progeny for new generations.

He is interested in palaeoclimate proxies, biotic evolution and stratigraphy, with particular emphasis on the fossil record of planktonic foraminifera from deep sea cores.

Schmidt, G.A., 1999: Forward modeling of carbonate proxy data from planktonic foraminifera using oxygen isotope tracers in a global ocean model.

Proxy trees that are several hundred years old or proxy [insect (chironomids) or planktonic] sediments would have patterns that could be compared to the ice cores.

Algae - Photosynthetic, often microscopic and planktonic, organisms occurring in marine and freshwater ecosystems.

He also studies the impact of changes in sea ice on marine planktonic ecosystems by developing biophysical models such as the coupled Biology - Ice - Ocean Modeling and Assimilation System (BIOMAS).

Experimental evidence suggests that this decreasing pH will reduce the calcium carbonate concentration, compromising the calcification of the skeletons of marine organisms, such as corals and planktonic mollusks (pteropods).

They focus on two maritime sources of proxy data: coral and individual planktonic foraminifera (monocellular organisms that float in seawater at various depths).

The increase in planktonic diatoms is significant as a harbinger of weaker nutrient flow throughout the lake.

Sea butterflies, which are an odd planktonic mollusc, have just been found to be profoundly affected.

There are both planktonic, or floating in the water column, and benthic, or bottom dwelling, forms.

Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera

Measurements of stable isotopes of planktonic and benthic foram and diatom shells have been taken from hundreds of deep - sea cores around the world to map past surface and bottom water temperatures.

Given the inconsistent SST reconstructions obtained using existing paleotemperature equations and the recently identified parameters controlling shell d18O values, there is a clear need to reexamine the temperature: d18O relationships for planktonic foraminifera.»

''... worked with two sediment cores they extracted from the seabed of the eastern Norwegian Sea, developing a 1000 - year proxy temperature record «based on measurements of δ18O in Neogloboquadrina pachyderma, a planktonic foraminifer that calcifies at relatively shallow depths within the Atlantic waters of the eastern Norwegian Sea during late summer,» which they compared with the temporal histories of various proxies of concomitant solar activity... This work revealed, as the seven scientists describe it, that «the lowest isotope values (highest temperatures) of the last millennium are seen ~ 1100 - 1300 A.D., during the Medieval Climate Anomaly, and again after ~ 1950 A.D.» In between these two warm intervals, of course, were the colder temperatures of the Little Ice Age, when oscillatory thermal minima occurred at the times of the Dalton, Maunder, Sporer and Wolf solar minima, such that the δ18O proxy record of near - surface water temperature was found to be «robustly and near - synchronously correlated with various proxies of solar variability spanning the last millennium,» with decade - to century - scale temperature variability of 1 to 2 °C magnitude.»

Next paper: Bemis, B. E., H. J. Spero, J. Bijma, and D. W. Lea (1998), Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations, Paleoceanography, 13 (2), 150 — 160.

The whole oceanic set of ecosystems globally will be able to benefit from that important flow of nutrients and the planktonic and other organisms that utilise them.

S1; Table S1): alkenone (n = 31), planktonic foraminifera Mg / Ca 24 (n = 19), TEX86 (n = 4), fossil chironomid transfer function (n = 4), fossil pollenmodern analog 25 technique (MAT)(n = 4), ice - core stable isotopes (n = 5), other microfossil assemblages (MAT and 26 Transfer Function)(n = 5), and Methylation index of Branched Tetraethers (MBT)(n = 1).

Bemis, et al., discuss this problem on page 152: «Non-equilibrium d18O values in planktonic foraminifera have never been adequately explained.

«These planktonic organisms are the life support system of the planet.»

The TEX86 will be further analysed in well - dated cores from the Holocene and Pleistocene and compared with other, previously determined, SST proxies such as the UK37 ′ and the d18O of planktonic foraminifera.

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.

Contrarily, planktonic foraminifera diversified, and dinoflagellates bloomed.

The annual average SST proxy used δ18O in planktonic foraminifera in a radiocarbon - dated 1990 Bermuda Rise box core.

This is also true for planktonic CaCO3 - secreters such as coccolithophorids and foraminifera.

But that was the time that the forefathers of the current sea species (mainly planktonic coccoliths) made the white cliffs of Dover and thick carbonate deposits in many places.

Using Mg / Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool, we estimate the tropical Pacific climate sensitivity parameter (λ) to be 0.94 — 1.06 °C (W m − 2) − 1, higher than that predicted by model simulations of the Last Glacial Maximum or by models of doubled greenhouse gas concentration forcing.

We report variations in planktonic foraminifera from varved sediments off southern California spanning the past 1400 years.

Azumi Kuroyanagi, Régine E. da Rocha, Jelle Bijma, Howard J. Spero, Ann D. Russell, Stephen M. Eggins, Hodaka Kawahata, Effect of dissolved oxygen concentration on planktonic foraminifera through laboratory culture experiments and implications for oceanic anoxic events, Marine Micropaleontology, Volume 101, May 2013, Pages 28 - 32, ISSN 0377 - 8398, http://dx.doi.org/10.1016/j.marmicro.2013.04.005.

Zachos measured individual foram shells from the deep sea, and found that for the planktonic ones, they were either heavy or light, never transitional.

Or you may simply watch, mesmerised as your torch beams draw thousands of planktonic organisms to swarm over your lights.

Further south lies the rocky outcrop of Koh Bon Island with regular manta ray sightings especially between February and April when upwelling currents concentrate planktonic food near the surface.

When unsuspecting planktonic animals get ensnared in the tentacles of the Ctenophore, the tasty morsel is drawn into the body of the animal for consumption.

shallow seismic stratigraphy and radiocarbon dating of planktonic foraminifera.

Quave, C. L., Plano, L. R., Pantuso, T., and Bennett, B. C. Effects of extracts from Italian medicinal plants on planktonic growth, biofilm formation and adherence of methicillin - resistant Staphylococcus aureus.

Not to be confused with an itchy, stinging rash caused by jellyfish larvae, these sea lice are planktonic marine parasites which feed on many types of fish.

We now realize that bacteria are hardly ever found individually (in what is referred to as a planktonic state), but instead frequently join communities.

Comparison of genomic features shared between C. symbiosum and planktonic marine Crenarchaeota reveals several emergent themes.

This event had eliminated dinosaurs, pterosaurs, ammonites and belemnites, as well as many groups of birds, bivalves, brachiopods, marine reptiles, plants and planktonic organisms.

Planktonic foraminifera are typically less than 0.1 mm in diameter.

His areas of expertise are paleoceanography of surface and deep - ocean circulation using micropaleontological and geochemical tracers; planktonic foraminiferal ecology and paleoecology; and paleoclimatology from cave deposits.

Psudeo - nitzschia «Pseudo-nitzschia is a marine planktonic diatom genus containing some species capable of producing the neurotoxin domoic acid (DA), which is responsible for the neurological disorder known as amnesic shellfish poisoning (ASP).»

Using Mg / Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool, we estimate the tropical Pacific climate sensitivity parameter (λ) to be 0.94 — 1.06 °C (W m − 2) − 1, higher than that predicted by model simulations of the Last Glacial Maximum or by models of doubled greenhouse gas concentration forcing.

doi: 10.1016 / j.palaeo.2011.08.014 The effect of sea surface properties on shell morphology and size of the planktonic foraminifer Neogloboquadrina pachyderma in the North Atlantic

Surface and sub-surface seawater temperature reconstruction using Mg / Ca microanalysis of planktonic foraminifera Globigerinoides ruber, Globigerinoides sacculifer and Pulleniatina obliquiloculata.

This release of Ensembl Metazoa includes two new species, the planktonic crustacean Daphnia magna and the stalk - eyed fly Teleopsis dalmanni.

Tube worms release eggs and sperm, typical of most marine invertebrates, which form a planktonic larvae.

Early Earth also was hotter than today, the sea contained great amounts of dissolved silica due to a lack of planktonic organisms like today that use it for their shells.