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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...
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...
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.
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Freshwater Microbial Ecology01:24

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...

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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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Published on: May 7, 2016

Speciation in ancient lakes.

K Martens1

  • 1The Freshwater Biology Section, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, 1000 Brussels, Belgium.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Ancient lakes, like Tanganyika and Baikal, harbor exceptional biodiversity and endemic species due to their long-term existence. Their high faunal diversity results from complex evolutionary processes, not just simple accumulation.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Limnology

Background:

  • Few lakes globally are ancient, persisting for millions of years.
  • Examples include Lake Tanganyika and Lake Baikal, existing for 12-20 million years.
  • Ancient lakes contrast sharply with short-lived post-glacial lakes in their ecological characteristics.

Purpose of the Study:

  • To investigate the factors contributing to the exceptional biodiversity in ancient lakes.
  • To identify common patterns in faunal diversity and speciation across different ancient lake systems.
  • To understand the evolutionary processes shaping life in long-standing aquatic environments.

Main Methods:

  • Comparative research across multiple ancient lake systems.
  • Documentation of speciation processes within specific faunal groups.
  • Analysis of immigration, speciation, and extinction dynamics.

Main Results:

  • Ancient lakes exhibit significantly higher faunal diversity and endemicity compared to younger lakes.
  • Repeated patterns in evolutionary processes have been identified through comparative research.
  • While ultra-rapid speciation occurs, no single exclusive speciation mechanism for ancient lakes has been confirmed.

Conclusions:

  • The high biodiversity in ancient lakes is a product of complex evolutionary dynamics, including immigration, speciation, and extinction.
  • Long-term environmental stability in ancient lakes facilitates sustained diversification.
  • Understanding these processes is key to conserving unique aquatic ecosystems.