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Related Concept Videos

What is Biodiversity?01:19

What is Biodiversity?

Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
What is an Ecosystem?01:17

What is an Ecosystem?

Overview
Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

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Related Experiment Video

Updated: Jun 1, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
10:23

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

Published on: July 11, 2025

Marine biodiversity characteristics.

Gilles Boeuf1

  • 1Laboratoire Arago, UMR 7232, biologie intégrative des organismes marins, université Pierre-&-Marie-Curie/CNRS, avenue du Fontaulé, 66650 Banyuls-sur-Mer, France. gboeuf@obs-banyuls.fr

Comptes Rendus Biologies
|June 7, 2011
PubMed
Summary

Marine ecosystems harbor vast biodiversity and biomass, driving crucial Earth processes. Despite their ancient origins, marine species diversity is surprisingly low compared to terrestrial life, posing evolutionary questions.

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Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

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Area of Science:

  • Marine Biology
  • Evolutionary Biology
  • Bioprospecting

Background:

  • Oceans host immense biomass, including phytoplankton and bacteria, vital for Earth's organic matter production.
  • Life originated in oceans over 3.8 billion years ago, with key evolutionary events occurring within marine environments.
  • Twelve out of 31 animal phyla are exclusively marine, highlighting the ocean's unique biodiversity.

Purpose of the Study:

  • To explore the evolutionary patterns of marine versus terrestrial species diversity.
  • To investigate the potential of marine organisms as sources of pharmacological compounds and research models.
  • To emphasize the importance of marine resource management for biodiversity preservation.

Main Methods:

  • Comparative analysis of marine and terrestrial species distribution over evolutionary time.
  • Review of existing literature on marine biodiversity, biomass, and evolutionary history.
  • Assessment of marine organisms' role in scientific discovery and bioprospecting.

Main Results:

  • Marine life, despite its ancient origins and significant biomass, exhibits lower species diversity compared to terrestrial life.
  • Marine organisms are rich sources of molecules with pharmacological potential (>15,000 identified) and serve as critical models in life sciences.
  • The shift towards increased terrestrial species diversity is a relatively recent evolutionary event.

Conclusions:

  • The lower species diversity in marine environments compared to land warrants further evolutionary investigation.
  • Marine biodiversity offers substantial resources for scientific research and the development of new medicines.
  • Urgent and adequate management strategies are required to protect marine habitats, resources, and biodiversity from current threats.