Reconstruction of past changes in salinity and climate using a diatom-based transfer function

Fritz, Sherilyn C.; Juggins, Steve; Battarbee, Rick; Engstrom, Daniel R.

doi:10.1038/352706a0

Cited by 334 publications

(152 citation statements)

References 10 publications

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“…suggest low salinity at this time, corroborating inferences from sedimentary diatom assemblages (Fritz, et al, 1991). Pollen and geochemical results indicate that the region was covered by spruce forest, with soil conditions that favored the leaching of iron and manganese into drainage waters entering the lake.…”

Section: Discussionsupporting

confidence: 81%

“…Devils Lake, in eastern North Dakota, is in a closed drainage basin of about 9800 km . The lake was formed in a depression resulting from glacial thrusting of the underlying Bay in an area where the water depth was 7.5 m. "Diatom analyses (Fritz, et al, 1991) were performed on point samples, and the bulk-carbonate geochemistry samples integrated 2-cm sections of core overlapping with the diatom samples. Ostracode samples came from 8-cm sections adjacent to the diatom and bulk carbonate samples" (p. 80).…”

Section: Discussionmentioning

confidence: 99%

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Evaluating Short-Term Climate Variability in the Late Holocene of the Northern Great Plains

Hartman¹

1999

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This literature study investigated methods and areas to deduce climate change and climate patterns, looking for short-term cycle phenomena and the means to interpret them. Many groups are actively engaged in intensive climate-related research. Ongoing research might be (overly) simplified into three categories: 1) historic data on weather that can be used for trend analysis and modeling; 2) detailed geological, biological (subfossil), and analytical (geochemical, radiocarbon, etc.) studies covering the last 10,000 years (about since last glaciation); and 3) geological, paleontological, and analytical (geochemical, radiometric, etc.) studies over millions of years. Of importance is our ultimate ability to join these various lines of inquiry into an effective means of interpretation. At this point, the process of integration is fraught with methodological troubles and misconceptions about what each group can contribute. This project has met its goals to the extent that it provided an opportunity to study resource materials and consider options for future effort toward the goal of understanding the natural climate variation that has shaped our current civilization.A further outcome of this project is a proposed methodology based on "climate sections" that provides spatial and temporal correlation within a region. The method would integrate cultural and climate data to establish the climate history of a region with increasing accuracy with progressive study and scientific advancement (e. g., better integration of regional and global models).i EVALUATING SHORT-TERM CLIMATE VARIABILITY IN THE LATE HOLOCENE OF THE NORTHERN GREAT PLAINS EXECUTIVE SUMMARYThe debate over the importance of anthropogenic effects on the environment cannot be fully appreciated or resolved until human industrial, agricultural, and domestic impacts are understood in the context of natural climate change. Arguments over climate trends need to consider the recent geologic record. Placing events resulting from climatic fluctuations into the context of a span of time greater than human activity provides a more complete basis upon which to interpret human effect on the environment. The importance of a thorough understanding of this natural climate variability is heightened as greater preventive measures are enacted to restrict the release of greenhouse gases into the environment. Because actions taken on behalf of the environment will have global economic impacts, it is imperative that we develop a better understanding of global climate change to determine if modern climate trends are the result of human activity, natural variability, or some combination of these factors.Clearly, major changes in climate have occurred over geologic time, as well as significant changes during preindustrial civilizations. Ongoing studies indicate that variations in climate may have occurred regularly over the last few thousand years. The debate over the importance of natural climate variability versus anthropogenic causes of climate change cannot be resolved until mo...

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Evaluating Short-Term Climate Variability in the Late Holocene of the Northern Great Plains

Hartman¹

1999

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“…Much published work has been focused on inland lakes (e.g. Fritz et al 1991;Bennion et al 1996;Bigler and Hall 2003) but there are relatively few equivalent datasets for coastal lake and estuarine environments. However, some inference models have been developed and applied (e.g.…”

Section: Introductionmentioning

confidence: 99%

A diatom dataset and diatom-salinity inference model for southeast Australian estuaries and coastal lakes

Saunders

2010

J Paleolimnol

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To quantify the relationship between diatom species assemblages and the water chemistry of southeast Australian estuaries and coastal lakes, a new dataset of 81 modern diatom samples and water chemistry data was created. Three hundred and ninetynine species from 53 genera were identified in 36 samples from 32 coastal water bodies in eastern Tasmania and 45 samples from 13 coastal water bodies in southern Victoria. Multivariate statistical analyses revealed that the sampling sites were primarily distributed along salinity and nutrient gradients, and that salinity, nitrate ? nitrite, phosphate and turbidity explained independent portions of variance in the diatom data. Species salinity optima and tolerances were determined and a diatom-salinity inference model (WAinv r 2 = 0.72, r 2 jack = 0.58, RMSEP = 0.09 log ppt) was developed. This new information on diatom species' salinity preferences provides a useful tool for quantitatively reconstructing salinity changes over time from diatom microfossils preserved in the sediments of a range of estuaries and coastal lakes in southeast Australia. This is valuable for studies investigating long-term human impacts and climate change in the region.

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“…We modified the species specific abundance-weighted optimum (AO) and abundance-weighted tolerance (AT) equations of Fritz et al [18], for making it suitable for the vertical profile of the physico-chemical variables. We introduce here the abundanceweighted tolerance index (ATI),…”

Section: Abundance Weighted Valuesmentioning

confidence: 99%

“…Species-wise abundance-weighted optimum values (AO) and tolerances (AT) for different physico-chemical variables are being used mainly for palaeoecological researches [18]. We have modified these equations for the vertical profile of these variables in the marine system.…”

Section: Introductionmentioning

confidence: 99%

Plankton and the Invisible Barriers in the Tropical Ocean

Karati¹,

Vineetha²,

Tv³

et al. 2017

JAMB

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Diel vertical migration (DVM) is one of the major biological rhythms observed among zooplankton. In tropical environments (TrE), zooplankton is believed to exhibit prominent DVM. Chaetognath, a major vertical migrator among zooplankton in the global ocean, was studied from the Bay of Bengal, an important zone in TrE of Indian Ocean. Here a novel method (abundance-weighted tolerance index) was introduced which was successful in predicting the species, capable of performing DVM. The vertical profiles of physico-chemical variables exhibited a wide variation in upper 1000 m and only two species of the total twenty-five species exhibited significant DVM which opposed the general concept of DVM in TrE. The pronounced variations in physico-chemical variables acted as invisible barriers for zooplankton to perform DVM. The observed restricted DVM will have significant impact on the marine ecological processes including biological pump in the system.

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Reconstruction of past changes in salinity and climate using a diatom-based transfer function

Cited by 334 publications

References 10 publications

Evaluating Short-Term Climate Variability in the Late Holocene of the Northern Great Plains

Evaluating Short-Term Climate Variability in the Late Holocene of the Northern Great Plains

A diatom dataset and diatom-salinity inference model for southeast Australian estuaries and coastal lakes

Plankton and the Invisible Barriers in the Tropical Ocean

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