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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Arctic Ocean
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Mendeleyev Ridge (3)
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Norwegian Sea (1)
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Atlantic Ocean
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biogeography (1)
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Canada
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upper Pleistocene (2)
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Europe
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Mollusca
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Bivalvia
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Mytilus
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Mytilus edulis (1)
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Protista
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Foraminifera
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Miliolina
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Miliolacea
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Quinqueloculina (2)
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Rotaliina
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Buliminacea
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Bolivinitidae
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Bolivina (1)
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Rotaliacea
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Textulariina
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isotopes
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Mesozoic
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Cretaceous
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Ocean Drilling Program
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Leg 113
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ODP Site 690 (2)
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Leg 207
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oxygen (1)
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Plantae
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sediments
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Southern Ocean
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Weddell Sea
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Maud Rise (2)
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United States
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Atlantic Coastal Plain (1)
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Florida
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Everglades (1)
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Indian River County Florida (1)
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Miami-Dade County Florida (1)
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Monroe County Florida (1)
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Saint Lucie County Florida (2)
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Maryland
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Calvert County Maryland (3)
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Texas
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Refugio County Texas (1)
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sediments
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sediments
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marine sediments (5)
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Benthic Foraminiferal Community Changes Across the Miocene Climatic Optimum Identified by Shebi Analysis (She Analysis for Biozone Identification), Calvert Cliffs, Maryland, USA
Oceanic-Scale Species Diversity of Living Benthic Foraminifera: Insights into Neogene Diversity, Community Structure, Species Duration, and Biogeography
The Later Holocene Foraminifera of Liverpool Bay (Bae Lerpwl), British Isles: Morphospecies and Community Level Patterns
Foraminifera Associated With Swirled Spartina Patens Beds on Perched Marshes Along the Rocky Coastline of Lunenburg County, Nova Scotia
On Replicates for Comparing Species Densities in Space and Time
The Ecological Balance of Nature: Identifying Stasis and Growth in Late Cretaceous Planktonic Foraminifera from ODP Hole 690C (Weddell Sea)
Identifying disruptions to the ecological balance of nature: a foraminiferal example across the initiation of the Paleocene–Eocene thermal maximum
Abstract: This study investigated the extent to which deep-dwelling, infaunal foraminifera bias modern and fossil distributions in the subtropical mangroves of the Everglades (southwest Florida), and which sediment interval should be used as a modern analog for paleoenvironmental studies in this area. Typically, these studies are based on modern analogs from the upper 1 to 2 cm of sediments, as most benthic foraminifera live in the surface 1 cm, but in tropical mangrove environments, deep-dwelling infaunal foraminifera may be more common. The vertical distributions of live assemblages in cores from a mudflat and three mangrove sites were investigated. To examine the preservation potential of dead tests, distributions of wall types and inner test linings were recorded. The living depths of benthic foraminifera showed a landward deepening from 1 to 3 cm in mudflats and low mangroves and from 7 to 10 cm in middle and high mangroves, possibly due to a landward increase in oxygenation of the subsurface sediments. Modern assemblages from the top 2 cm included species common in the deep infauna and contained, on average, 36% of the total standing crop. Additions to total assemblages at greater depths by subsurface production were negligible. Thus, the upper 2 cm of the sediment column would be sufficient as a modern analog for paleoenvironmental studies in the southwestern Everglades. Preservation of dead tests is influenced by a landward increase in the degradation of agglutinated taxa through oxidation/bacterial breakdown of organic cements. Fortuitously, calcareous taxa preserve well in the carbonate-buffered sediments of the Everglades.
ABSTRACT The distribution and taxonomy of modern benthic foraminifera are described for the western Sunda Shelf, southern South China Sea off northeast peninsular Malaysia. This study provides baseline foraminiferal data that can be utilized in paleoenvironmental reconstructions of Neogene sediments from the Sunda Shelf and elsewhere in the Indo-Pacific. The uppermost centimeter of 60 surface sediment samples (> 150 µm) from nearshore (8 m) to inner shelf (60 m) water depths yielded 125 species. The distribution of these species is described and 120 species are illustrated with color light microscope digital images and scanning electron microscope imagery. Five sample assemblages, CGT1-CGT5 are interpreted from the results of the cluster analysis of total (live plus dead) foraminiferal relative abundance data. Discriminant analysis demonstrates that these five groups are statistically distinguishable at the 95% confidence level. The distribution of groups is related to variations in depth and substrate grain-size. This relationship is reaffirmed by canonical correspondence analysis. Closest to shore (8–14 m water depth), the high diversity (49 species) assemblage (CGT1), characterized by Amphistegina radiata and Amphistegina lessonii , occurs in medium to coarse quartz sand substrates, likely derived from the nearby Terengganu River. In slightly deeper water (21–22 m) and in gravelly quartz sand substrates, the lower diversity (33 species) assemblage of CGT2 is strongly dominated by Amphistegina radiata and Amphistegina lessonii . CGT3 occurs in shelly muddy quartz sand substrates (32–41 m), has a high diversity assemblage (46 species), and is characterized by Assilina ammonoides , Amphistegina radiata and Discorbinella bertheloti . Berthierine internal molds of Amphistegina lessonii and Amphistegina radiata are common in CGT1, CGT2 and CGT3, possibly indicating reworking from Pleistocene deposits in the region. High diversity (51 species) assemblage CGT4 occurs in mud substrates (44–59 m) and is characterized by Heterolepa dutemplei and Asterorotalia milletti ; the nearshore, sandy substrate taxa Amphistegina radiata and Amphistegina lessonii are absent. CGT5, located farthest from shore at 60 m water depth and in shelly sandy mud and shelly muddy sand, has a high diversity assemblage (46 species) characterized by Heterolepa dutemplei and Assilina ammonoides , with rare Asterorotalia milletti . This assemblage may be, in part, a lag deposit associated with modern bottom currents. The results of this study were combined with previously published research to identify nine foraminifera-based environmental subdivisions in the southern South China Sea: mangrove swamps in Terengganu and Sabah, Malaysia; high salinity lagoonal and inlet assemblages in Terengganu, Malaysia; low salinity estuarine assemblages in Terengganu, Malaysia; Mekong Delta assemblages; nearshore areas in the northern Gulf of Thailand off the mouths of rivers; inner shelf environments off the Mekong delta and off Johore, Malaysia dominated by Asterorotalia pulchella ; shallow inner shelf (<40 m water depth) environments from Terengganu and Johore, Malaysia; inner shelf environments (40–100 m water depth) off Terengganu, Malaysia and on the east-central Sunda Shelf; outer shelf environments (100–200 m water depth) on the east-central Sunda Shelf. The subdivisions are related mainly to salinity in marginal marine environments and substrate type and depth/distance from shore in shelf environments.