Living benthic Foraminifera in the Adriatic Sea; influence of water depth and sediment

1977 ◽  
Vol 7 (1) ◽  
pp. 62-75 ◽  
Author(s):  
F.-W. Haake
Keyword(s):  
Water Depth ◽  
Benthic Foraminifera ◽  
Adriatic Sea ◽  
Influence Of Water

scholarly journals Foraminiferal response to the deposition of insolation cycle 90 sapropel in different Mediterranean areas

2008 ◽  
Vol 27 (1) ◽  
pp. 45-61 ◽  
Author(s):  
Simona Stefanelli ◽  
Lucilla Capotondi
Keyword(s):  
Water Depth ◽  
Benthic Foraminifera ◽  
Adriatic Sea ◽  
Oxygen Depletion ◽  
Recent Theory ◽  
Ionian Sea ◽  
Mediterranean Areas ◽  
Depositional Settings ◽  
Bottom Waters ◽  
Wet Climate

Abstract. Foraminifera were investigated across the sapropel unit corresponding to insolation cycle 90 deposited in three different oceanographic and depositional settings of the Mediterranean Sea (Alboran Sea, South Adriatic Sea and Ionian Sea). The constant presence of benthic foraminifera throughout the sapropels at <2000 m water depth and their absence within the sapropel at greater depth (>3000 m) indicate that the severity of oxygen depletion at the time of sapropel onset increases with increasing water depth.Planktonic and benthic foraminiferal patterns also document an interruption during sapropel deposition, which allows for the recognition of two sapropel phases. In all basins, the short interruption appears to be related to climatic deterioration, which led to the break in stratification and, hence, to the re-oxygenation of bottom waters. Since the interruption of the time-equivalent sapropel intervals has been documented previously in other Mediterranean areas, these data support the recent theory that this interruption must have been a trans-Mediterranean phenomenon and that the interruption records a short excursion out of the periods of wet climate associated with precessional minima.

Abyssal benthic foraminifera in the eastern equatorial Pacific (IODP EXP 320) during the middle Eocene

2013 ◽  
Vol 87 (6) ◽  
pp. 1160-1185 ◽  
Author(s):  
Hiroyuki Takata ◽  
Ritsuo Nomura ◽  
Akira Tsujimoto ◽  
Boo-Keun Khim ◽  
Ik Kyo Chung
Keyword(s):  
Water Depth ◽  
Benthic Foraminifera ◽  
Middle Eocene ◽  
Accumulation Rate ◽  
Equatorial Pacific ◽  
Equatorial Pacific Ocean ◽  
Ocean Drilling Program ◽  
Integrated Ocean Drilling Program ◽  
Eastern Equatorial Pacific ◽  
Study Interval

We report on the faunal transition of benthic foraminifera during the middle Eocene at Site U1333 (4862 m water depth, 3,560–3,720 m paleo-water depth) of Integrated Ocean Drilling Program Expedition 320 in the eastern equatorial Pacific Ocean. During the period ∼41.5–40.7 Ma, which includes carbonate accumulation event 3 (CAE-3), the benthic foraminiferal accumulation rate (BFAR) increased gradually and then it declined rapidly. In contrast, BFAR was considerably lower during ∼40.7–39.4 Ma, corresponding to the middle Eocene climatic optimum (MECO), and then it increased during ∼39.3–38.4 Ma, including CAE-4. Diversity (E [S200]) was slightly lower in the upper part of the study interval than in the lower part. The most common benthic foraminifera were Nuttallides truempyi, Oridorsalis umbonatus, and Gyroidinoides spp. in association with Globocassidulina globosa and Cibicidoides grimsdalei during the period studied. Quadrimorphina profunda occurred abundantly with N. truempyi, O. umbonatus, and G. globosa during ∼39.4–38.4 Ma, including CAE-4, although this species was also relatively common in the lower part of the study interval. Virgulinopsis navarroanus and Fursenkoina sp. A, morphologically infaunal taxa, were common during ∼38.8–38.4 Ma, corresponding to the late stage of CAE-4. Based on Q-mode cluster analysis, four sample clusters were recognized and their stratigraphic distributions were generally discriminated in the lower and upper parts of the study interval. Thus, there was only a small faunal transition in the abyssal eastern equatorial Pacific during the middle to late-middle Eocene. The faunal transition recognized in this study may be related to recovery processes following intense carbonate corrosiveness in the eastern equatorial Pacific during MECO.

scholarly journals Diffuse reflectance of oceanic shallow waters: Influence of water depth and bottom albedo

1994 ◽  
Vol 39 (7) ◽  
pp. 1689-1703 ◽  
Author(s):  
Stéphane Maritorena ◽  
André Morel ◽  
Bernard Gentili
Keyword(s):  
Water Depth ◽  
Diffuse Reflectance ◽  
Shallow Waters ◽  
Influence Of Water ◽  
Bottom Albedo

Influence of water depth on growth and mortality of Chlamys varia (Linnaeus, 1758): implications for cage culture in Mali Ston Bay, Croatia

2016 ◽  
Vol 25 (1) ◽  
pp. 135-146 ◽  
Author(s):  
Mara Rathman ◽  
Jakša Bolotin ◽  
Nikša Glavić ◽  
Josip Barišić
Keyword(s):  
Water Depth ◽  
Cage Culture ◽  
Influence Of Water

scholarly journals A Late Palaeocene–Early Eocene benthic foraminiferal record from Bovlstrup, Denmark, showing a remarkable agglutinated fauna

1997 ◽  
Vol 16 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Gitte Vestergaard Laursen ◽  
Søren Blegvad Andersen
Keyword(s):  
Water Depth ◽  
Benthic Foraminifera ◽  
Oil Well ◽  
Overlying Water ◽  
Sea Floor ◽  
Low Diversity ◽  
Foraminiferal Record ◽  
Clay Formation ◽  
Detailed Record ◽  
Dense Sampling

Abstract. The Bovlstrup well, Denmark, provides a detailed record of benthic foraminifera from the Upper Palaeocene and Lower Eocene deposits. The investigated interval spans four litho-units: an informal Grey Clay unit, the Holmehus Formation, the Ølst Formation and the Røsnæs Clay Formation (Danian?–Ypresian). Five interval zones based on benthic foraminifera have been established. Three of these zones (Zones 2, 3, and 4) contain exclusively agglutinated faunas. No foraminifera have previously been found in the Ølst Formation (Late Thanetian–Early Ypresian), but at Bovlstrup the formation contains a remarkable low-diversity agglutinated fauna (Zone 4). A programme of relatively dense sampling yielded information that may be lost in commercial oil well analysis. The five foraminiferal zones at Bovlstrup are correlated to established North Sea zonations, and the recognition of the faunas of Zones 3 and 4 leads to the conclusion that the zonation of King (In: Jenkins, D. G. &amp; Murray, J. W. (Eds), Stratigraphical Atlas of Fossil Foraminifera, Ellis Horwood, 1989) can be refined.The benthic faunas indicate changes in the bottom environment both at the sea floor and within the overlying water mass. A transition from a calcareous fauna to an agglutinated fauna is interpreted as the result of a change from a neutral to a slightly acidic environment at the sea floor. There is a fluctuation in water depth through the studied section with a minimum water depth during the Thanetian and Early Ypresian. Volcanic ash layers in the Ølst Formation presumably resulted in low pH values, thereby causing the extreme low diversity of the benthic foraminiferal faunas.

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