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Related Concept Videos

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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Green Algae01:21

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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 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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Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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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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Updated: Aug 2, 2025

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Single-cell adaptations shape evolutionary transitions to multicellularity in green algae.

Charlie K Cornwallis1, Maria Svensson-Coelho2, Markus Lindh3

  • 1Department of Biology, Lund University, Lund, Sweden. charlie.cornwallis@biol.lu.se.

Nature Ecology & Evolution
|April 20, 2023
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Summary

Environmental factors like nitrogen can trigger multicellularity in algae, but it may not be adaptive. Instead, extracellular matrix production, influenced by nitrogen, drives group formation and multicellular life evolution.

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Microbiology

Background:

  • The evolution of multicellular life is a key driver of biodiversity.
  • Natural environmental conditions favoring multicellular group formation remain poorly understood.

Purpose of the Study:

  • To experimentally investigate how predation, nitrogen, and water turbulence influence multicellular group formation in unicellular green algae.
  • To determine if multicellularity in algae is an adaptive trait linked to population growth.
  • To explore the role of extracellular matrix (ECM) and palmelloid formation in multicellularity.

Main Methods:

  • Experimentally exposed 35 wild unicellular green algae strains (19 Chlorophyta species) to varying environmental factors.
  • Assessed multicellular group formation and population growth rates under different conditions.
  • Analyzed ecological data from 478 lakes over 55 years, examining 332 algae species distribution.

Main Results:

  • Predation, nitrogen, and water turbulence all induced multicellular group formation, but this was not linked to increased population growth.
  • Population growth correlated with extracellular matrix (ECM) production and palmelloid formation.
  • Increased nitrogen levels enhanced ECM production, leading to more palmelloids and higher rates of multicellular group formation.
  • Field data confirmed that ECM and nitrogen availability predict patterns of obligate multicellularity across diverse lake ecosystems.

Conclusions:

  • Environmental challenges may drive unicellular adaptations, such as ECM production, which can facilitate the evolution of multicellularity.
  • Nitrogen availability and ECM production are key factors influencing multicellular group formation in algae, both experimentally and in natural environments.
  • The study suggests that adaptations to environmental stress, rather than direct adaptive benefits of multicellularity, might be crucial for understanding the evolutionary pathways to multicellular life.