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Speciation Rates

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.

Genetics of Speciation

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...

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

The Evidence for Evolution

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.

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...

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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

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Related Experiment Video

Updated: Jun 19, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Published on: May 7, 2016

Ocean currents mediate evolution in island lizards.

Ryan Calsbeek¹, Thomas B Smith

¹Center for Tropical Research, Institute of the Environment, University of California, Los Angeles, California 90065, USA. calsbeek@ucla.edu

|December 5, 2003

Summary

This summary is machine-generated.

Hurricanes cause island inundation, leading to lizard recolonization via over-water dispersal. This gene flow constrains adaptive diversification in Anolis lizards, challenging the idea of islands as isolated evolutionary laboratories.

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Area of Science:

Evolutionary Biology
Island Biogeography
Ecology

Background:

Islands are crucial for studying evolution due to assumed limited gene flow.
Hurricane-induced inundation can devastate island lizard populations.
Recolonization after storms often occurs via over-water dispersal.

Purpose of the Study:

To re-examine the role of gene flow in island evolution.
To investigate the impact of over-water dispersal on Anolis lizard populations.
To understand how gene flow influences adaptive radiation on islands.

Main Methods:

Analyzing patterns of gene flow among Bahamian Anolis lizard populations.
Correlating gene flow with prevailing ocean currents.
Assessing the relationship between gene flow and divergence in fitness-related morphology.

Main Results:

Over-water dispersal, influenced by ocean currents, is a significant factor in island lizard population dynamics.
Increased gene flow among islands leads to decreased divergence in fitness-related morphology.
Adaptive diversification in Anolis lizards is constrained by post-hurricane gene flow.

Conclusions:

The assumption of isolated replicates on islands needs re-evaluation.
Over-water dispersal plays a critical, previously undocumented role in island adaptive radiation.
Gene flow significantly impacts evolutionary trajectories and speciation potential in island systems.