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Related Concept Videos

Other Algae01:19

Other Algae

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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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Overview of Algae01:28

Overview of Algae

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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Primary Production01:06

Primary Production

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Red Algae01:23

Red Algae

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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Updated: Jan 9, 2026

A Standardized Procedure for Monitoring Harmful Algal Blooms in Chile by Metabarcoding Analysis
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Global floating algae blooms are expanding.

Lin Qi1,2, Menghua Wang1, Brian B Barnes3

  • 1NOAA Center for Satellite Applications and Research, College Park, MD, USA.

Nature Communications
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Summary
This summary is machine-generated.

Global oceans show significant increases in both macroalgae and microalgae blooms. Satellite data reveals unprecedented expansion rates, likely driven by ocean warming and eutrophication.

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Area of Science:

  • Marine biology
  • Oceanography
  • Remote sensing

Background:

  • Algal blooms, including microscopic algae (phytoplankton) and larger macroalgae, have increased in various ocean regions over the past two decades.
  • A comprehensive global assessment of these algal increases has been lacking.

Purpose of the Study:

  • To quantify the global distribution and trends of macroalgal mats and microalgal scums using satellite imagery.
  • To analyze changes in algal bloom areas from 2003 to 2022.

Main Methods:

  • Analysis of 1.2 million satellite images using artificial intelligence (AI).
  • Quantification of macroalgal mats and microalgal scums across global oceans.
  • Statistical analysis of expansion rates over a 20-year period.

Main Results:

  • Macroalgae blooms covered a cumulative area of 43.8 million km².
  • Significant expansion rates observed: macroalgae at 13.4% per year (since 2003) in the tropical Atlantic and western Pacific, and microalgae at 1.0% per year (since 2003).
  • Expansion rates for macroalgae accelerated significantly since the 2010s.

Conclusions:

  • Ocean warming and eutrophication are probable drivers of observed algal bloom trends.
  • A potential regime shift favoring macroalgae and specific microalgae species is suggested.
  • Findings have significant implications for ocean ecology, carbon sequestration, and marine economies.