Historical Relationships between Phosphorus Loading and Biogenic Silica Accumulation in Bay of Quinte Sediments

1985 ◽  
Vol 42 (8) ◽  
pp. 1401-1409 ◽  
Author(s):  
Claire L. Schelske ◽  
Daniel J. Conley ◽  
William F. Warwick
Keyword(s):  
Biogenic Silica ◽  
Drainage Basin ◽  
Sediment Accumulation ◽  
Lake Ontario ◽  
Domestic Sewage ◽  
Phosphorus Loading ◽  
Accumulation Rates ◽  
Urban Centers ◽  
European Settlement ◽  
Historical Relationship

Sediments from Warwick's 1972 Glenora-B core from the Bay of Quinte, Lake Ontario, were analyzed to compare the historical relationship between the accumulation of biogenic silica (BSi) and total phosphorus (TP). The similarities in patterns provide evidence that increased phosphorus (P) inputs caused increased diatom production and BSi accumulation. BSi accumulation increased soon after initial European settlement by French Sulpicians in 1669 and reached maximum levels during the early 1850s when forest clearance and erosion of the deforested drainage basin increased sediment accumulation rates 110-fold compared with rates before 1669. Maximum rates of BSi and TP accumulation increased 170-fold and 150-fold, respectively, during the same period. Ratios of BSi:TP were about sixfold greater in the sediments deposited after 1888 than in those deposited prior to 1669, indicating that the proportion of available P in TP inputs increased with increased disposal of domestic sewage into the bay as populations shifted to urban centers. Increases in BSi accumulation above the Ambrosia horizon (dated at 1852) indicate that sediments can be a significant sink for BSi. Although the onset of Si depletion cannot be confirmed with data from this core, there is clear evidence that BSi accumulation increased as the result of increased P inputs.

Historical Nutrient Enrichment of Lake Ontario: Paleolimnological Evidence

1991 ◽  
Vol 48 (8) ◽  
pp. 1529-1538 ◽  
Author(s):  
Claire L. Schelske
Keyword(s):  
Primary Productivity ◽  
Nutrient Enrichment ◽  
Lake Ontario ◽  
Phosphorus Loading ◽  
Moderate Increase ◽  
Sediment Record ◽  
Carbon Production ◽  
European Settlement ◽  
Exponential Increase ◽  
Major Nutrients

Recent studies of Lake Ontario show four periods of nutrient enrichment that can be identified from the sediment record in this phosphorus-limited system: pristine phosphorus loads (early 1800s before European settlement), moderate increase in phosphorus loading after settlement (beginning approximately 1850), exponential increase in phosphorus loading from urban sources (approximately 1940–70), and decreased phosphorus loading as the result of phosphorus abatement strategies (beginning in mid-1970s). Paleolimnological data are used to infer new paradigms about historical dynamics and cycling of major nutrients. The temporal pattern of organic carbon production closely parallels changes in phosphorus loading. Silica supplies which were replete for diatom production before forest clearance in the mid-1800s became limiting for diatom production in the summer epilimnion after 1865 and in the water column after 1950. Silica reserves were depleted by increased diatom production and sedimentation that resulted from increased phosphorus loading. Biologically induced precipitation of calcite began after 1940 as an indirect effect of increased urban phosphorus loading on primary productivity. Calcite began to be precipitated when historical increases in CO2 utilized for primary productivity increased epilimnetic pH and the calcium carbonate saturation product was exceeded.

Observations on the recent history of Lough Neagh and its drainage basin

1978 ◽  
Vol 281 (981) ◽  
pp. 303-345 ◽  
Keyword(s):  
Drainage Basin ◽  
Sediment Accumulation ◽  
Lake Basin ◽  
Accumulation Rates ◽  
Historical Sources ◽  
Lough Neagh ◽  
Vegetational Change ◽  
Diatom Genus ◽  
History Of ◽  
Two Stages

The present study traces the recent development of Lough Neagh from the microfossil record of the lake sediment. The history of vegetational change in the catchment area is discussed on the basis of pollen analytical information and by reference to primary and secondary documentary historical sources. Changes in the history of the lake itself are inferred from changes in the relative composition of diatom assemblages in the sediment and from changes in the calculated influx of diatoms to the sediment. The accumulation of sediment in the lake basin is discussed and radiometric data ( 14 C, 137 Cs, 210 Pb) are used to construct a sediment chronology from which accumulation rates are calculated. It is shown that the rate has increased from about 0.08 cm a-1 (where a is the symbol for year) in A.D. 1700 to about 0.8 cm a -1 today. Four major stages in the recent development of the lake are indicated: a pre-disturbance stage ( > 2000 B.C. to ca . a.d. 1700), a stage of accelerated mineral inwash (from ca . A.D. 1700); and two stages of cultural eutrophication (from ca . 1915 and from ca . 1960 respectively). The eutrophication stages are characterized by increased sediment accumulation rates, increased diatom influx rates, and the emergence of Stephanodiscus as the most important diatom genus.

SEDIMENT ACCUMULATION RATES QUANTIFIED WITH COSMOGENIC NEON-21 ON A GLACIAL MORAINE, BLOODY CANYON, CA

2017 ◽  
Author(s):  
Daniel Morgan ◽  
◽  
Greg Balco ◽  
Alison Cribb ◽  
J. Warner Cribb ◽  
...  
Keyword(s):  
Sediment Accumulation ◽  
Accumulation Rates

Impacts of Phosphorus Loading Temporal Pattern on Benthic Algae Growth in Lake Ontario

2021 ◽  
pp. 126449
Author(s):  
Yuan Hui ◽  
Zhenduo Zhu ◽  
Joseph F. Atkinson ◽  
Angshuman M. Saharia
Keyword(s):  
Temporal Pattern ◽  
Lake Ontario ◽  
Benthic Algae ◽  
Phosphorus Loading ◽  
Algae Growth

The assessment of 210Pb data from sites with varying sediment accumulation rates

Hydrobiologia ◽  
1983 ◽  
Vol 103 (1) ◽  
pp. 29-35 ◽  
Author(s):  
P. G. Appleby ◽  
F. Oldfieldz
Keyword(s):  
Sediment Accumulation ◽  
Accumulation Rates

Linked variations in sediment accumulation rates and sea-level in Guanabara Bay, Brazil, over the last 6000years

2014 ◽  
Vol 415 ◽  
pp. 83-90 ◽  
Author(s):  
Alberto G. Figueiredo ◽  
Mauro B. de Toledo ◽  
Renato C. Cordeiro ◽  
José M.O. Godoy ◽  
Fabiano T. da Silva ◽  
...  
Keyword(s):  
Sea Level ◽  
Sediment Accumulation ◽  
Guanabara Bay ◽  
Accumulation Rates ◽  
And Sea Level

Reconsidering the meaning of biogenic silica accumulation rates in the glacial Southern Ocean

The Diatoms ◽  
2012 ◽  
pp. 454-462 ◽  
Author(s):  
Christina L. De La Rocha ◽  
Olivier Ragueneau ◽  
Aude Leynaert
Keyword(s):  
Southern Ocean ◽  
Biogenic Silica ◽  
Accumulation Rates

scholarly journals High-resolution magnetostratigraphy of the upper Nacimiento Formation, San Juan Basin, New Mexico, USA: implications for basin evolution and mammalian turnover

2017 ◽  
Author(s):  
Caitlin Leslie ◽  
Daniel J. Peppe ◽  
Thomas E. Williamson ◽  
Dario Bilardello ◽  
Matthew Heizler ◽  
...  
Keyword(s):  
New Mexico ◽  
North America ◽  
Accumulation Rate ◽  
Global Climate ◽  
Sediment Accumulation ◽  
San Juan ◽  
Accumulation Rates ◽  
Fluvial System ◽  
San Juan Basin ◽  
Geomagnetic Polarity

Lower Paleocene deposits in the San Juan Basin document one of the best records of mammalian change and turnover following the Cretaceous-Paleogene extinctions and are the type section for the Puercan (Pu) and Torrejonian (To) North America Land Mammal age biozones (NALMA). One of the largest mammalian turnover events in the early Paleocene occurs between the Torrejonian 2 (To2) and Torrejonian 3 (To3) NALMA biozones. The Nacimiento Formation are the only deposits in North America where the To2-To3 mammalian turnover can be constrained, however the precise age and duration of the turnover is poorly understood due to the lack of a precise chronostratigraphic framework. We analyzed paleomagnetic samples, produced a 40Ar/39Ar detrital sanidine age, and developed a detailed lithostratigraphy for four sections of the upper Nacimiento Formation in the San Juan Basin, New Mexico (Kutz Canyon, Escavada Wash, Torreon West and East) to constrain the age and duration of the deposits and the To2-To3 turnover. The polarity stratigraphy for the four sections can be correlated to chrons C27r-C26r of the geomagnetic polarity time scale (GPTS). Using the local polarity stratigraphy for each section, we calculated a mean sediment accumulation rate and developed a precise age model, which allows us to determine the age of important late Torrejonian mammalian localities. Using the assigned ages, we estimate the To2-To3 turnover was relatively rapid and occurred over ~120 kyr (-60/+50 kyr) between 62.59 and 62.47 Ma. This rapid duration of the mammalian turnover suggests that it was driven by external forcing factors, such as environmental change driven by the progradation of the distributive fluvial system across the basin and/or changes in regional or global climate. Additionally, comparisons of the mean sediment accumulation rates between the sections that span from the basin margin to the basin center indicate that sediment accumulation rates equalized across the basin from the end of C27r through the start of C26r, suggesting an accommodation minima in the basin associated with the progradation of a distributive fluvial system into the basin. This accommodation minimum also likely led to the long hiatus of deposition between the Paleocene Nacimiento Formation and the overlying Eocene San Jose Formation.

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