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Topic: Polycystine

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The distribution of polycystine radiolarians in the world ocean is affected by a special set of ecological conditions, which characterize the water masses they live in.
The distribution patterns of polycystine radiolarians in the surface sediments of the world ocean may therefore be severely altered by intensive and even complete dissolution of the biogenic opal microfossils.
Polycystine radiolarians have therefore to be separated from the remaining plankton material by using a strong oxydizing agent or a low temperature asher where the organic material is being burned off.
www.radiolaria.org /quaternary.htm   (1792 words)

 Chapter 10.htm
The famous Polycystine marl of Barbados in the Antilles, which Robert Schomburgk discovered forty years ago, belongs to the Miocene formation, and is the richest and best known of all the important Radiolarian deposits (see L. 16, pp.
The Cainozoic Polycystine tripoli or marl of the Mediterranean coast, which is probably always of Miocene origin, forms very extensive mountain ranges both in the south of Europe (Sicily, Calabria, Greece) and in the north of Africa (from Oran to Tripoli) (§ 246).
To this category belong the pure Miocene Polycystine marls of Barbados (§ 246), the Tertiary Polycystine clay of the Nicobar Islands (§ 247), and the Polycystine quartz of the Jura (§ 248).
caliban.mpiz-koeln.mpg.de /~stueber/haeckel/challenger/Chap10.htm   (4587 words)

 Amazon.com: Polycystine: Books   (Site not responding. Last check: 2007-11-04)
An annotated and indexed bibliography of polycystine Radiolaria, principally from a taxonomic and stratigraphic viewpoint by William R Riedel (Unknown Binding - 1967)
Polycystines, phaeodarians, and acantharians are all planktonic; they are found exclusively...
(1988), Orbulina Caron and Swanberg (1990) Globigerinella Globorotalia Globoquadrina POLYCYSTINE RADIOLARIA 7halassicolla Anderson (...
www.amazon.com /s?ie=UTF8&keywords=Polycystine&tag=httpexplaguid-20&index=books&link_code=qs&page=1   (732 words)

 NHM - Geologisk seksjon
Polycystine Radiolarians in the Greenland-Iceland-Norwegian (GIN) Seas: Species and assemblage distribution.
Polycystine radiolarians in the Nordic Seas: Factor Analysis, Cluster Analysis and Paleotemperatures.
Polycystine radiolarians as paleotemperature proxy during the Late Pleistocene-Holocene in the Norwegian Sea.
www.toyen.uio.no /geomus/homepages/CV-engelsk_JKD_nov_2005.html   (719 words)

Boltovskoy, D., Riedel, W.R. Polycystine Radiolaria from the Southwestern Atlantic ocean plankton.
Boltovskoy, D., Riedel, W.R. Polycystine Radiolaria of the California Current region: seasonal and geographic patterns.
Boltovskoy, D., Uliana, E., Wefer, G. Seasonal variations in the flux of microplankton and radiolarian assemblage compositions in the northeastern tropical Atlantic at 2195 m.
biolo.bg.fcen.uba.ar /boltovs.htm   (1510 words)

 Biogeographic and ecologic perspective on polycystine radiolarian evolution -- Casey et al. 9 (4): 363 -- Paleobiology
Biogeographic and ecologic perspective on polycystine radiolarian evolution -- Casey et al.
Biogeographic and ecologic perspective on polycystine radiolarian evolution
Ecological pressure from diatoms and planktonic foraminiferans appears to have been related to macroevolutionary events bounding the Cretaceous-Tertiary transition.
paleobiol.geoscienceworld.org /cgi/content/abstract/9/4/363   (214 words)

The radiolarian assemblage is very diverse and dominated by the counting-group Arachnocorallium, an indicator of eutrophication.
Paleoecological evaluation of the fauna indicates that polycystin radiolarians occupied various ecological niches.
Radiolarian taxa, known to be abundant in association with a subsurface layer of chlorophyll-a maxima are much better represented in the sapropel S5 than above it, suggesting that this deep layer of primary productivity was much stronger and better developed during accumulation of the sapropel.
www-odp.tamu.edu /publications/160_SR/ABSTRACT/11.HTM   (318 words)

Abelmann, A., and Gowing, M. Spatial distribution of living polycystine radiolarian taxa - baseline study for paleoenvironmental reconstructions in the Southern Ocean (Atlantic sector).
Boltovskoy, D., and Riedel, W. Polycystine Radiolaria from the Southwestern Atlantic ocean plankton.
Boltovskoy, D., and Riedel, W. Polycystine Radiolaria of the California Current region: seasonal and geographic patterns.
palaeo-electronica.org /1998_2/boltovskoy/refer.htm   (2015 words)

 NHM - Geologisk seksjon
Research area: Taxonomy of living and fossil polycystine radiolarians in the northern Atlantic Ocean, the Nordic Seas and the Arctic Ocean.
The polycystine radiolarians in the Arctic Ocean and its marginal seas are studied for their species and fauna assemblage distribution.
The grouping of radiolarians into higher rank taxa is tested as a new tool in paleoecological reconstructions (sea surface temperatures and ocean current systems).
www.toyen.uio.no /geomus/homepages/bjorklund.html   (154 words)

 [No title]
The Santa Barbara Basin contains a sedimentary record ideal for high-resolution paleoclimate studies because of the annual varves and regional- to global-scale climate signals preserved in the sediments [Lange et al., 1990; Kennett and Ingram, 1995], even though it does not lie directly in the path of the California Current.
A nearly 100-year annual time series (1909-1991) of polycystine radiolarian assemblages from Santa Barbara Basin sediments was analyzed to the species level.
Counts on a replicate Santa Barbara Basin core, dated 1870-1987, indicate that these results are reproducible and that the flux of a few representative species can be extrapolated to estimate fluxes of environmentally sensitive groups.
www.agu.org /pubs/abs/pa/97PA00986/97PA00986.html   (311 words)

 Life History and Ecology of the Radiolaria
The symbiotic relationship that radiolarians share with dinoflagellates enable them to use a jelly-like layer to trap their prey.
Observations show that polycystine Radiolaria have their greatest density and diversity in the eutrophic, nutrient rich, waters of the California Current, with decreasing densities in the Gulf Stream and Gulf of Mexico.
Radiolaria populations are very low in the eutrophic shallow waters, which tend to lack symbiotic algae.
www.ucmp.berkeley.edu /protista/radiolaria/radlh.html   (499 words)

 Departamento de
Vertical flux and sedimentation rates of fossilizable microzooplankton on the basis of sediment trap materials (easter tropical Atlantic); plankton-sediment traps-surface sediments similarities in species assemblages.
Holocene - latest Pleistocene pelagic paleoecology on the basis of species-specific radiolarian (polycystine) assemblages.
The groups most intensively covered in these studies are polycystine radiolarians and tintinnids; heterotrophic dinoflagellates, naked ciliates, phaeodarians, cysts, silicoflagellates, pteropod molluscs, etc. are also covered in ecologically oriented surveys.
biolo.bg.fcen.uba.ar /planing.htm   (1784 words)

 AWI: Research - Marine Geology - Publications
Abelmann A and Gowing MM (1997) Spatial distribution pattern of living polycystine radiolarian tax - baseline study fpr paleoenvironmental reconstructions in the Southern Ocean (Atlantic sector).
Brey T and Mackensen A (1997) Stable isotopes prove shell growth bands in the Antarctic bivalve Laternula elliptica to be formed annually.
Zielinski U and Gersonde R (1997) Diatom distribution in Southern Ocean surface sediments: Implications for paleoenvironmental reconstructions.
www.awi-bremerhaven.de /GEO/Publ/RevArt1997.html   (321 words)

Classification and distribution of South Atlantic Recent Polycystine Radiolaria - published in Palaeontologica Electronica.
The web page contains information about radiolarians and a link to the Ehrenberg collection.
Mike Samworth shows here an old slide of polycystine radiolarians from the rocks of Barbados.
www.radiolaria.org /links.htm   (1067 words)

 Cambrian Explosion   (Site not responding. Last check: 2007-11-04)
The preservational bias favoring skeletons is well known, and applies to protists as surely as it does to animals.
Organisms that precipitate robust skeletons composed of diagenetically stable minerals are likely to be well represented in the fossil record – for example, the polycystine radiolaria and planktonic foraminifera.
In contrast, protists that form delicate biomineralized scales (e.g.
bill.srnr.arizona.edu /classes/182/CamExp.html   (4854 words)

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