Oxygen Isotope Studies on Sea Scallops, Placopecten magellanicus, from Browns Bank, Nova Scotia

1988 ◽  
Vol 45 (8) ◽  
pp. 1378-1386 ◽  
Author(s):  
F. C. Tan ◽  
D. Cai ◽  
D. L. Roddick
Keyword(s):  
Nova Scotia ◽  
Isotopic Composition ◽  
Oxygen Isotope ◽  
Placopecten Magellanicus ◽  
Ambient Seawater ◽  
Annual Cycles ◽  
Isotope Studies ◽  
Biological Evidence ◽  
Sea Scallops ◽  
External Growth

Oxygen isotope records from two sea scallops, Placopecten magellanicus, collected alive from Browns Bank, Nova Scotia, show annual cycles that closely approximate the isotopic composition predicted as a function of observed temperatures and the isotopic composition of the ambient seawater. The external growth lines coincided with the most positive δ18O values of the cycles, suggesting their formation during the period of coldest water temperatures (spring). The δ18O results indicate that the growth lines are annual events, consistent with the biological evidence.

Shell and tissue growth of juvenile sea scallops (Placopecten magellanicus) in suspended and bottom culture in Lunenburg Bay, Nova Scotia

Aquaculture ◽  
1996 ◽  
Vol 142 (1-2) ◽  
pp. 75-97 ◽  
Author(s):  
Sandra Kleinman ◽  
Bruce G. Hatcher ◽  
Robert E. Scheibling ◽  
Lawrence H. Taylor ◽  
Allan W. Hennigar
Keyword(s):  
Nova Scotia ◽  
Tissue Growth ◽  
Placopecten Magellanicus ◽  
Bottom Culture ◽  
Sea Scallops ◽  
Lunenburg Bay

Spatial and Temporal Overlap of the American Lobster (Homarus americanus) and Sea Scallop (Placopecten magellanicus) as Related to the impact of Inshore Scallop Dragging

1992 ◽  
Vol 49 (7) ◽  
pp. 1486-1492 ◽  
Author(s):  
D. L. Roddick ◽  
R. J. Miller
Keyword(s):  
Nova Scotia ◽  
Homarus Americanus ◽  
Fishing Effort ◽  
The Other ◽  
American Lobster ◽  
Placopecten Magellanicus ◽  
Time And Space ◽  
Sea Scallop ◽  
The Impact ◽  
Temporal Overlap

Assessment of the damage of one fishery by another requires knowledge of the overlap, in time and space, of the damaging fishing effort and the abundance of the damaged species, as well as a measure of the rate of damage. This approach was used to measure the impact of inshore scallop dragging on lobsters in Nova Scotia. Areas of reported co-occurrence of lobster and scallop grounds were surveyed by divers to determine the extent of overlap. Only 2 of 52 sites surveyed had lobsters on scallop grounds that could be dragged. Divers surveyed one site six times during 1987 and 1988 and found lobsters most abundant during August and September. Only 2% of the lobsters in the path of scallop drags were either captured or injured. The estimated value of lobsters destroyed by dragging for scallops during periods of peak lobster abundance was minor: $757 at one site and $176 at the other. Restricting dragging to periods of low lobster abundance significantly reduces this cost.

Titelbild: Oxygen Atom Transfer in the Photocatalytic Oxidation of Alcohols by TiO2: Oxygen Isotope Studies (Angew. Chem. 33/2009)

2009 ◽  
Vol 121 (33) ◽  
pp. 6085-6085
Author(s):  
Miao Zhang ◽  
Qi Wang ◽  
Chuncheng Chen ◽  
Ling Zang ◽  
Wanhong Ma ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Oxygen Isotope ◽  
Photocatalytic Oxidation ◽  
Atom Transfer ◽  
Oxygen Atom Transfer ◽  
Oxidation Of Alcohols ◽  
Isotope Studies

scholarly journals Oxygen isotope equilibrium in brachiopod shell fibres in the context of biological control

2008 ◽  
Vol 72 (1) ◽  
pp. 239-242 ◽  
Author(s):  
M. Cusack ◽  
A. Pérez-Huerta ◽  
P. Chung ◽  
D. Parkinson ◽  
Y. Dauphin ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Composition ◽  
Seawater Temperature ◽  
Environmental Data ◽  
Ambient Seawater ◽  
Secondary Layer ◽  
Vital Effect ◽  
Vital Effects ◽  
Stable Oxygen ◽  
Isotope Equilibrium

With their long geological history and stable low-Mg calcite shells, Rhynchonelliform brachiopods are attractive sources of environmental data such as past seawater temperature (Buening and Spero, 1996; Auclair et al., 2003; Brand et al., 2003; Parkinson et al., 2005). Concerns about the influence of vital effects on the stable isotope composition of brachiopod shells (Popp et al., 1986), led to isotope analyses of different parts of brachiopod shells in order to identify those parts of the shell that are influenced by any vital effect and those parts that may be suitable recorders of seawater temperature via stable oxygen isotope composition (Carpenter and Lohmann, 1995; Parkinson et al., 2005). Such detailed studies demonstrated that the outer primary layer of acicularcalcite is isotopically light in both δ18O and δ13C while the secondary layer, composed of calcite fibres, is in oxygen-isotope equilibrium with ambient seawater(Fig. 1) (Parkinson et al., 2005).

scholarly journals Characterization and significance of dedolomite in Wadi Nisah, central Saudi Arabia

GeoArabia ◽  
2007 ◽  
Vol 12 (3) ◽  
pp. 15-30 ◽  
Author(s):  
Dave L. Cantrell ◽  
Abdullah Al-Khammash ◽  
Peter D. Jenden
Keyword(s):  
Saudi Arabia ◽  
Isotopic Composition ◽  
Oxygen Isotope ◽  
Carbon Isotope ◽  
Carbon Isotopes ◽  
Reservoir Quality ◽  
Meteoric Diagenesis ◽  
Different Types ◽  
Lower Oxygen ◽  
Lower Carbon

ABSTRACT Two different types of calcified dolomite, or dedolomite, occur as stratiform and non-stratiform bodies within the Jurassic (Kimmeridgian) upper Jubaila Formation in the Wadi Nisah area of central Saudi Arabia. In the stratigraphically-equivalent subsurface Arab-D reservoir in eastern Saudi Arabia, two types of dolomite, stratiform and non-stratiform, occur which appear to be similar in architecture to the dedolomites examined in this study. However, Wadi Nisah dedolomites exhibit systematic changes in texture and isotopic composition from their precursor dolomites. Non-stratiform dedolomite contains lower oxygen isotope (average δ18O = -10.99‰) and much lower carbon isotope (average δ13C = -7.51‰) values and is much more coarsely crystalline than typical subsurface Arab-D non-stratiform dolomite; in contrast, Wadi Nisah stratiform dedolomite contains similar oxygen isotope values (δ18O = -2.89‰) and only slightly lower carbon isotopes (δ13C = 0.98‰) relative to subsurface Arab-D stratiform dolomites. We suggest that non-stratiform dolomite was more susceptible to late meteoric diagenesis than the horizontally bedded stratiform dolomite intervals. Such differences in character highlight the importance of structural and diagenetic architecture in determining later, post-dolomitization diagenesis and ultimately final reservoir quality.

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