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Related Experiment Video

Updated: Jul 12, 2026

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

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Early eutrophication in the lower great lakes:.

C L Schelske, E F Stoermer, D J Conley

Science (New York, N.Y.)

|October 21, 1983

Summary

Nutrient enrichment from early settlement caused eutrophication in the Great Lakes. Sediment core analysis reveals distinct diatom production timelines, marking the first silica-depletion sequence for the region.

Area of Science:

Environmental Science
Paleolimnology
Geochemistry

Background:

The Great Lakes ecosystem has experienced significant environmental changes.
Understanding historical nutrient loading is crucial for current water quality management.
Biogenic silica and diatom assemblages serve as proxies for past aquatic conditions.

Purpose of the Study:

To investigate the historical drivers of eutrophication in the lower Great Lakes.
To establish a timeline of nutrient enrichment and its impact on diatom production.
To document the silica-depletion sequence in Great Lakes sediments.

Main Methods:

Analysis of biogenic silica content in sediment cores.
Identification and quantification of diatom species within sediment layers.

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Dating of sediment cores to establish temporal sequences.

Main Results:

Eutrophication in the lower Great Lakes is linked to nutrient enrichment from early settlement and forest clearance.
Diatom production peaked at different times across lakes: 1820–1850 (Lake Ontario), ~1880 (Lake Erie), and 1970 (Lake Michigan).
This study presents the first sediment-based record of the silica-depletion sequence for the Great Lakes.

Conclusions:

Early human activities significantly altered Great Lakes' nutrient dynamics and ecosystem health.
The distinct timing of diatom peaks reflects differential responses to historical nutrient inputs across the lakes.
The documented silica-depletion sequence provides a novel paleoecological record for the Great Lakes region.