Why did some larger benthic foraminifers become so large and flat?

Sedimentology ◽  
2020 ◽  
Author(s):  
Pamela Hallock ◽  
Mona Seddighi
Keyword(s):  
Benthic Foraminifers

THE COMPOSITION AND DISTRIBUTION OF BENTHIC FORAMINIFERA AT CORAL REEF ECOSYSTEM IN THOUSANDS ISLAND

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Lumban Nauli Lumban Toruan ◽  
Dedi Soedharma ◽  
Kresna Tri Dewi
Keyword(s):  
Coral Reef ◽  
Human Activities ◽  
Close Association ◽  
Mesh Size ◽  
Coral Reef Ecosystem ◽  
Composition Distribution ◽  
Benthic Foraminifers ◽  
High Nutrient ◽  
Binocular Microscope ◽  
Reef Ecosystem

Composition and distribution of foraminifers are affected by human activities and have close association with coral reef ecosystem. The aims of this research were to investigate the benthic foraminifers’ composition and distribution in sediment of coral reef ecosystem. Eleven stations of Karang Bongkok, Pramuka, and Onrust Island were observed in this study. The sediments were taken from surface substrate up to 2 cm under the substrate. Samples were washed on sieve with mesh size 0,063 mm, and then dried in oven with 50°C of temperature  for two hours. After separating from the sediment, the foraminifers were laid on foraminiferal slide and indentified using binocular microscope. The highest composition of symbiont-bearing foraminiferal assemblages which associated with reef ecosystem was in East Pramuka (78.17%) and the lowest was in South Onrust (21,83%). The opportunistic type had the highest composition in South Onrust (38.67%) and the lowest was in South Karang Bongkok. In west Pramuka had the highest composition of heterotrophic type (57.17%) and the lowest was in North Onrust (11.33%). Onrust Island was dominated by opportunistic type, indicating high nutrient. The highest amount of foraminifers’ taxa was found in Karang Bongkok with good coral reef coverage, while the lowest in Onrust facing with Jakarta Bay. Keywords: composition, distribution, benthic foraminifers, coral reef.

Paleogene benthic foraminifers from the Loma Prieta Quadrangle, California

1989 ◽  
Author(s):  
Kristin McDougall
Keyword(s):  
Benthic Foraminifers ◽  
Loma Prieta

scholarly journals Potential Use of the Benthic Foraminifers Bulimina denudata and Eggerelloides advenus in Marine Sediment Toxicity Testing

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 775
Author(s):  
Mary McGann
Keyword(s):  
Sea Urchin ◽  
Marine Sediment ◽  
Sediment Toxicity ◽  
Toxicity Testing ◽  
Fertilization Success ◽  
Toxicity Tests ◽  
Sediment Chemistry ◽  
Benthic Foraminifers ◽  
Sediment Toxicity Tests ◽  
Unionized Ammonia

The benthic foraminifers Bulimina denudata and Eggerelloides advenus are commonly abundant in offshore regions in the Pacific Ocean, especially in waste-discharge sites. The relationship between their abundance and standard macrofaunal sediment toxicity tests (amphipod survival and sea urchin fertilization) as well as sediment chemistry analyte measurements were determined for sediments collected in 1997 in Santa Monica Bay, California, USA, an area impacted by historical sewage input from the Hyperion Outfall primarily since the late 1950s. Very few surface samples proved to be contaminated based on either toxicity or chemistry tests and the abundance of B. denudata did not correlate with any of these. The abundance of E. advenus also did not correlate with toxicity, but positively correlated with total solids and negatively correlated with arsenic, beryllium, chromium, lead, mercury, nickel, zinc, iron, and TOC. In contrast, several downcore samples proved to be contaminated as indicated by both toxicity and chemistry data. The abundance of B.denudata positively correlated with amphipod survival and negatively correlated with arsenic, cadmium, unionized ammonia, and TOC; E. advenus negatively correlated with sea urchin fertilization success as well as beryllium, cadmium, and total PCBs. As B. denudata and E. advenus are tolerant of polluted sediments and their relative abundances appear to track those of macrofaunal toxicity tests, their use as cost- and time-effective marine sediment toxicity tests may have validity and should be further investigated.

Test ultrastructure of some living benthic foraminifers

Lethaia ◽  
1974 ◽  
Vol 7 (1) ◽  
pp. 5-16 ◽  
Author(s):  
WILLIAM V. SLITER
Keyword(s):  
Benthic Foraminifers

Early Pliocene Benthic Foraminifers from the Salina Basin, Southeastern Mexico

1986 ◽  
Vol 32 (2) ◽  
pp. 191
Author(s):  
W. A. Berggren ◽  
B. Kohl
Keyword(s):  
Benthic Foraminifers ◽  
Early Pliocene

scholarly journals THE DISTRIBUTION OF BENTHIC FORAMINIFERA IN DAMAR ISLAND AND JUKUNG ISLAND, SERIBU ISLANDS

2010 ◽  
Vol 35 (2) ◽  
pp. 9-14
Author(s):  
Suhartati M. Natsir
Keyword(s):  
Coral Reef ◽  
Warning System ◽  
Reef Growth ◽  
Sunda Shelf ◽  
Benthic Foraminifers ◽  
Reef Degradation ◽  
Assessment And Monitoring ◽  
Coral Reef Degradation ◽  
Reef Condition

Seribu Islands are archipelago within Jakarta Bay built upon the pleistocene coral formation of the Sunda Shelf. The islands are characterized by unique and high biodiversity such as coral reefs. Since coral reef degradation would lead to a decrease of human prosperity, the determination of the coral reef quality is of high importance. Foraminifera offers an early warning system for the coral reef condition, as exemplified by the FORAM Index, i.e. Foraminifera in Reef Assessment and Monitoring Index. This study compared the foraminiferal community structure and the FORAM Index of two islands between the Damar Besar and Jukung. Both islands were dominated by symbiont-bearing foraminifera of the genera Amphistegina, Calcarina, Heterostegina, Marginophora, and Operculina. However, the number of benthic foraminifers at Jukung Island was higher than that at Damar Besar Island, having 17 individuals per species on average. Jukung Island was a conducive site to reef growth, as indicated by a FORAM Index (between 6,48 and 6,57), and Damar Besar Island was liable to environmental change.

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