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Formation of Species

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 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...

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.

Hybrid Zones

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...

Understanding Species and Reproductive Barriers

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...

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.

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In situ Protocol for Butterfly Pupal Wings Using Riboprobes

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La mariposa polimórfica revela el eslabón perdido en la especiación ecológica.

Nicola L Chamberlain¹, Ryan I Hill, Durrell D Kapan

¹Faculty of Arts and Sciences Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)

|November 7, 2009

Resumen

Este estudio revela una etapa clave en la especiación ecológica donde surgen rasgos distintos dentro de una sola población. Las mariposas con diferencias de color mostraron apareamiento asortativo, cerrando la brecha entre los grupos de cruce y las nuevas especies.

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Área de la Ciencia:

Biología evolutiva Biología evolutiva.
Investigación de la especiación.
Ecología del comportamiento ecología del comportamiento.

Sus antecedentes:

La especiación ecológica impulsa el aislamiento reproductivo a través de la selección divergente.
Una fase crítica y poco estudiada implica la segregación de rasgos dentro de una sola población.
Comprender esta etapa es clave para vincular las poblaciones de cruzamiento con especies distintas.

Objetivo del estudio:

Investigar las primeras etapas de la especiación ecológica.
Examinar la segregación de rasgos y la preferencia de pareja en una población polimórfica de mariposas.
Identificar el vínculo entre la divergencia ecológica y el aislamiento reproductivo.

Principales métodos:

Empleó el mapeo genético y la genética de poblaciones.
Realizó experimentos de elección de pareja y observaciones de campo.
Estudió una población de mariposas exhibiendo polimorfismo mimético del color del ala.

Principales resultados:

Se ha observado una preferencia parcial, basada en el color y la selección de pareja en mariposas.
Documentó la segregación de rasgos ecológicos y reproductivos relevantes.
Demostró la asociación entre un rasgo de reconocimiento y el comportamiento de apareamiento dentro de una población.

Conclusiones:

Los rasgos observados representan componentes clave del aislamiento sexual en especies incipientes.
Esta población proporciona un ejemplo del eslabón perdido en la especiación.
La asociación entre el rasgo y el comportamiento puede acelerar la probabilidad de especiación.