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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
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...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.

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Related Experiment Video

Updated: Jun 5, 2026

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
14:38

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

Published on: April 20, 2012

Marine speciation on a small planet.

S R Palumbi1

  • 1Stephen Palumbi is at the Dept of Zoology and Kewalo Marine Laboratory, University of Hawaii, Honolulu, HI 96822, USA.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary

Marine speciation occurs across vast ocean distances. Transient isolation, gamete ecology, and molecular evolution at recognition loci are key drivers, offering new research avenues for marine biologists.

Area of Science:

  • Marine biology
  • Evolutionary biology
  • Genetics

Background:

  • Marine species exhibit population structures spanning thousands of kilometers.
  • The mechanisms of speciation in large marine environments remain incompletely understood.
  • Oceans present unique challenges for reproductive isolation and genetic divergence.

Purpose of the Study:

  • To investigate the factors driving speciation in marine populations with large geographic scales.
  • To explore the role of transient isolation and gamete interactions in marine speciation.
  • To bridge insights from plant reproductive biology to marine systems.

Main Methods:

  • Analysis of population structure across large oceanic distances.
  • Investigation of gamete ecology and reproductive compatibility.

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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

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Last Updated: Jun 5, 2026

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
14:38

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

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An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles
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  • Molecular evolution studies focusing on gamete recognition loci.

    • Main Results:

    • Transient isolation events appear crucial for initiating divergence in marine species.
    • Gamete ecology, including recognition and interaction, significantly influences reproductive success and isolation.
    • Molecular evolution at gamete recognition loci shows patterns consistent with rapid divergence.

    Conclusions:

    • Speciation in marine environments is influenced by factors analogous to those in plants, such as reproductive isolation mechanisms.
    • Transient isolation and gamete-level processes are vital for understanding marine biodiversity.
    • Further research integrating molecular and ecological approaches is warranted for marine speciation.