Speciation
Speciation - Related Videos
01:07
Speciation Rates
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2026
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.
02:16
Genetics of Speciation
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2026
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...
12:22
Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Cited by 6 •
2015
The technique of diffusive gradients in thin films (DGT) is proposed for speciation studies of plutonium. This protocol describes diffusion experiments probing the behavior of Pu(IV) and Pu(V) in presence of organic matter. DGTs deployed in a karstic spring allow assessment of the bioavailability of Pu.
06:00
Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy
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Cited by 3 •
2022
This protocol presents a detailed procedure to prepare biological cryosamples for synchrotron-based X-ray absorption spectroscopy experiments. We describe all the steps required to optimize sample preparation and cryopreservation with examples of the protocol with cancer and phytoplankton cells. This method provides a universal standard of sample cryo-preparation.
07:24
Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Cited by 8 •
2018
An investigation of the oxidative combustion chemistry of novel biofuels, fuel components, or jet fuels by comparison of quantitative speciation data is presented. The data can be used for kinetic model validation and enables fuel assessment strategies.This manuscript describes the atmospheric high-temperature flow reactor and demonstrates its capabilities.
FAQs
Reduced gene flow allows populations to follow more independent evolutionary paths. When individuals exchange fewer genes between populations, genetic differences produced by mutation, natural selection, and genetic drift are less likely to be mixed. Over time, this separation can support reproductive barriers and the persistence of distinct species.
The three evolutionary forces contribute in different ways to divergence. Mutation adds genetic variation, natural selection can favor differences associated with local conditions, and genetic drift can alter genetic differences through chance. As these changes accumulate in populations with reduced gene flow, they can contribute to reproductive isolation and eventually separate species.
Not all reproductive barriers depend on physical distance. Populations may become less likely to exchange genes when they differ in mating behavior, reproduce at different times, or occupy different habitats. These differences can reduce successful interaction and gene flow, allowing genetic divergence to continue. This pathway shows how ecological or behavioral differences can contribute to speciation alongside geographic separation.
Geographic separation can reduce contact between populations, limiting gene flow while each population accumulates genetic differences. Mutation, natural selection, and genetic drift may then act on the separated populations, increasing divergence. If reproductive barriers develop, the populations may remain distinct, making separation an important route through which speciation can proceed.
Research on speciation connects changes within populations to larger patterns of biodiversity. By considering genetic differences, gene flow, and reproductive barriers, biologists can interpret how adaptation and diversification arise and how extinction may shape biological patterns. This perspective helps explain the evolutionary processes underlying biodiversity.
Speciation research has practical value beyond reconstructing evolutionary history. Its findings can inform taxonomy and conservation planning by identifying populations that may be diverging or becoming reproductively isolated. It also helps researchers consider how environmental change could shape the future of populations and ecosystems, linking evolutionary processes with biodiversity management.