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Related Concept Videos

Other Algae01:19

Other Algae

63
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Green Algae01:21

Green Algae

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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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The Periodic Table and Organismal Elements00:57

The Periodic Table and Organismal Elements

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Updated: Aug 19, 2025

Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
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Global decrease in heavy metal concentrations in brown algae in the last 90 years.

J R Aboal1, C Pacín1, R García-Seoane2

  • 1CRETUS. Ecology Section. Universidade de Santiago de Compostela, Spain.

Journal of Hazardous Materials
|December 4, 2022
PubMed
Summary
This summary is machine-generated.

Global heavy metal pollution in brown algae has significantly decreased by 60-84% over the last 50 years. This study tracked worldwide brown algae (seaweed) for 90 years, finding major reductions in toxic metals like lead and mercury.

Keywords:
BiomonitoringClimate changeHazardous elementsMarine pollutionTemporal trends

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Area of Science:

  • Environmental Science
  • Marine Biology
  • Ecotoxicology

Background:

  • Heavy metal pollution poses a significant global environmental and toxicological challenge.
  • Brown algae (seaweed) are crucial marine food web components and potential pollutant bioindicators.
  • Understanding long-term heavy metal trends in marine ecosystems is vital for assessing pollution dynamics.

Purpose of the Study:

  • To conduct the first global assessment of heavy metal concentration changes in brown algae over the past 90 years (1933-2020).
  • To identify trends in specific heavy metals (Cd, Co, Cr, Cu, Fe, Hg, Mn, Pb, Zn) within brown algae tissues.
  • To investigate correlations between metal concentration trends and environmental factors like pH, sea surface temperature (SST), and heat content.

Main Methods:

  • Analysis of a comprehensive global dataset (>15,700 data points) of brown algae heavy metal concentrations from 1933 to 2020.
  • Statistical evaluation of temporal trends for multiple heavy metals across different brown algae families.
  • Correlation analysis to link observed metal concentration changes with environmental parameters.

Main Results:

  • A significant decrease in heavy metal concentrations (Cd, Co, Cr, Cu, Fe, Hg, Mn, Pb, Zn) in brown algae tissues, ranging from 60% to 84% (approximately 2% annually).
  • These declines were consistent across major brown algae families (Dictyotaceae, Fucaceae, Laminariaceae, Sargassaceae) and initiated between 1970 and 1990.
  • Strong correlations were found between metal trends and changes in pH, SST, and ocean heat content, suggesting complex environmental interactions.

Conclusions:

  • Brown algae exhibit a substantial reduction in heavy metal burdens over the last five decades, indicating a positive environmental shift.
  • While environmental factors and algal adaptations may contribute, the observed declines likely reflect successful implementation of environmental policies reducing oceanic metal pollution.
  • The reduction in bioavailable metals within foundational species like brown algae has significant implications for marine food web health and pollutant distribution.